Toward Stable and Efficient Mixed-Cation Mixed-Halide Perovskite Solar Cells

International Journal of Emerging Science and Engineering (IJESE) ISSN: 2319–6378 (Online), Volume-13 Issue-12, November 2025 18 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number:100.1/ijese.L262513121125 DOI:10.35940/ijese.L2625.13121125 Journal Website: www.ijese.org Toward Stable and Efficient Mixed-Cation MixedHalide Perovskite Solar Cells Gulab Singh Verma, Divya Tripathy, Puspanjali Hota, Sashikant, Toleshwar Prasad Rajwade, Aloke Verma Abstract: Mixed-cation, mixed-halide lead halide perovskites have rapidly progressed from laboratory curiosities to contenders for next-generation photovoltaics. By judiciously alloying A-site cations (Cs⁺, FA⁺, MA⁺) and halide anions (I⁻/Br⁻), these materials marry outstanding optoelectronic quality and bandgap tunability, enabling single-junction devices exceeding 26% and hybrid perovskite–silicon tandems to approach ~35% certified efficiency. Despite these gains, light-induced halide segregation, ion migration, interfacial recombination, and environmental/thermal instability remain central challenges for scale-up and lifetime. This review synthesises the historical context and recent progress on triple-cation, mixed-halide absorbers; surveys at least twenty key studies spanning passivation such as FABr treatments, defect/strain management, and tandem integration; and outlines practical, research-grade synthesis/processing steps for Cs–FA– MA Pb (I, Br) ₃. We discuss characterization workflows via XRD, GIWAXS, PL/TPV/TRPL, UPS/Kelvin probe, JV under MPP tracking, EQE-EL reciprocity, and ISOS durability protocols, outline consensus findings, and map future directions, including wide-bandgap perovskites for stable tandems, ion-migrationaware design of devices, and AI-guided compositional/process discovery. Certified record data from NREL anchors the current efficiency landscape. Keywords: Perovskite Solar Cells; Triple-Cation Cs–FA–MA; Halide Segregation; Perovskite-Silicon Tandem; Passivation; Stability; Efficiency Records. Nomenclature: XRD: X-Ray Diffraction QFLS: Quasi-Fermi Level Splitting UPS: Ultraviolet Photoelectron Spectroscopy I. INTRODUCTION The modern perovskite photovoltaics (PV) story began Manuscript received on 24 October 2025 | First Revised Manuscript received on 30 October 2025 | Second Revised Manuscript received on 05 November 2025 | Manuscript Accepted on 15 November 2025 | Manuscript published on 30 November 2025. *Correspondence Author(s) Gulab Singh Verma, Scholar, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: [email protected], ORCID ID: 0009-0005-4727-7220 Divya Tripathy, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: [email protected] Puspanjali Hota, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: [email protected] Sashikant, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: [email protected], ORCID ID: 0009-0004-9008-6385 Toleshwar Prasad Rajwade, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: [email protected], ORCID ID: 0009-0008-9114-3336 Dr. Aloke Verma*, Assistant Professor, Department of Physics, Kalinga University, Naya Raipur (Chhattisgarh), India. Email ID: ID:[email protected], ORCID ID: 0000-0003-4583-5987 © The Authors. Published by Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open-access article under the CC-BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/ With dye-sensitized architectures employing hybrid lead halides as sensitizers, soon pivoting to solid-state, thin-film devices, as unexpectedly long carrier diffusion lengths and benign defect physics emerged [1]. Rapid efficiency escalations from single digits to >20% within a few years were catalyzed by compositional engineering, interface control, and processing innovations [2]. A milestone for phase stability, crystallization robustness, and device reproducibility included the introduction of triple-cation compositions (typically written as CsₓFAᵧMA₁₋ₓ₋ᵧPb(I₁₋zBrz)₃), which outperformed singlecation analogues [3]. Saliba and coworkers' demonstration that adding small fractions of inorganic cesium to FA/MA matrices yields more stable black-phase perovskites helped establish the field's compositional "default" for high performance [4]. Concurrently, mixed-halide alloying (I/Br) provided a practical lever to tune band gaps into the 1.65-1.8 eV window desirable for the top cells of monolithic perovskite silicon tandems [5]. Notably, this also highlighted the problem of light-induced halide phase segregation, in which illumination drives I-rich/Br-rich domain formation, red-shifts emission, and erodes open-circuit voltage [6]. Therefore, substantial effort has focused on mitigating segregation via strain management, entropy-stabilised formulations, passivation, and carrier/ion management strategies [7]. Today's efficiency landscape reflects this maturation. NREL's research-cell chart logs ~27.0% for single-junction perovskites and ~34.9% for certified 2terminal perovskite-Si tandems (July 2025), positioning hybrid tandems as the near-term path beyond the ShockleyQueisser limit of single-junction Si. Meanwhile, III-V (GaAs) remains the single-junction benchmark (~29.1%), thin-film CIGS and CdTe set ~23-24% records, and OPV/DSSC benchmarks sit lower, useful yardsticks for contextualizing perovskite progress [8]. Alongside device records, the research frontier increasingly targets stability and scalability: controlling ion migration, alleviating interfacial non-radiative losses, engineering robust wide-bandgap chemistries, and translating lab-scale spin-coating to slot-die, blade, and vapour routes [9]. Very recent reports explore FABr posttreatments, bifacial passivation, and poly-Si tunnelling recombination layers for tandems; complementary perspectives dissect ion migration's dual role [10]. Percolating AI/ML workflows accelerate recipe discovery across vast compositional and process-design spaces [11]. Toward Stable and Efficient Mixed-Cation Mixed-Halide Perovskite Solar Cells 19 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number:100.1/ijese.L262513121125 DOI:10.35940/ijese.L2625.13121125 Journal Website: www.ijese.org II. EVOLUTION AND ADVANCES IN MIXEDCATION MIXED-HALIDE PEROVSKITE SOLAR CELLS Mixed-cation, mixed-halide hybrid perovskite solar cells have emerged over the past decade amid intense development in halide chemistry and photovoltaic engineering. The early attempts focused on addressing the instability issues of MAPbI₃ by incorporating multiple A-site cations, thereby enhancing crystallinity and suppressing volatility. The real breakthrough came with the triple-cation system: Cs–FA– MA. Superior reproducibility, tolerance to environmental conditions, and phase stability set the stage for further achievements. This effectively stabilised the desirable αphase of FAPbI₃, improved carrier lifetime, and optimised grain quality while minimising trap-state formation through partial Cs incorporation [12]. In parallel with cation alloying, mixed-halide engineering was developed to tune the bandgap, enabling the development of wide-bandgap absorbers suitable for tandem solar architectures. Regrettably, halide segregation upon light illumination remained a persistent issue, driven by ionic mobility, lattice strain, and light intensity, resulting in iodideand bromide-rich domains that are detrimental to device uniformity. Later, it was demonstrated that such segregations can be suppressed by defect and strain engineering; compositional control improved the photophysical uniformity in α-FAPbI₃ films. Further ion migration studies elucidated its role in hysteresis, phase instability, and longterm degradation, now recognised as significant challenges to device durability [13]. Other significant developments include progress in surface and interface passivation. Organic salts, secondary crystallisation methods, and halide re-distribution increased grain size, improved film density, and prolonged carrier lifetimes. Besides, Cs-modified hole-transport-layer engineering enabled complementary pathways toward intrinsic device stability by further improving charge extraction and reducing recombination losses [14]. Efforts have also focused on incorporating these perovskite absorbers into tandem architectures that go beyond the limits of single-junction efficiency. The development of robust interconnection layers has allowed for efficient optical coupling and mechanical stability in perovskite/silicon tandems. Devices reported to date have achieved efficiencies above 33%, close to the theoretical limit of more than 42%. Flexible tandem variants have also achieved high performance in lightweight, portable applications favoured nowadays. Wide-bandgap mixed-halide absorbers with bromine content in the 20–30% range have so far proved very effective for highly efficient tandem top cells [15]. Recent updates from international efficiency databases confirm that single-junction perovskite devices now reach around 27% certified efficiency, while two-terminal perovskite/silicon tandems approach 35%. These values have been reproduced by several independent laboratories, which indicates readiness for pre-commercial deployment of this technology. The emphasis of contemporary research is on overcoming the remaining challenges in long-term operational stability, scalable fabrication, and defect-tolerant material processing. Extensive reviews now point out that the strategies of entropy stabilisation, interface design, and crystallisation assisted by additives have turned mixed-cation mixed-halide perovskites into a versatile materials platform. Early compositional tuning has given way to advanced strategies revolving around defect passivation and the formation of homogeneous microstructures. In general, integrating chemical design, process optimisation, and interfacial engineering has made these materials a promising route toward next-generation, high-efficiency, and costeffective solar energy technologies [16]. III. EXPERIMENTAL METHOD In general, the fabrication of mixed-cation, mixed-halide perovskite solar cells follows a well-optimised solutionprocessed route that yields smooth, crystalline, and defectminimised thin films. Target absorber composition in this context is generally represented as CsₓFAᵧMA₁₋ₓ₋ᵧPb(I₁₋zBrz)₃, where Cs⁺, FA⁺, and MA⁺ occupy the A-site of the perovskite lattice. The halide sublattice consists of iodide and bromide in controlled ratios [17]. Typical compositions include Cs fractions of 5-15%, FA fractions of 70-90%, and the remaining portions in MA. Tuning of the halide ratio, particularly the bromine fraction within the range of 20-50%, can be used to adjust the optical bandgap from about 1.55 to 1.75 eV, meeting the requirements for high-efficiency single-junction devices and top cells in perovskite-silicon tandem configurations [18]. The synthesis generally starts with the preparation of a highpurity precursor solution containing lead halides, PbI₂ and PbBr₂, along with organic halides such as FAI, MAI, and CsI. Solvents such as DMF and DMSO are mixed in a 4:1 volume ratio to dissolve the salts [19]. Additives such as methylammonium chloride or thiocyanates are commonly added to control crystallisation kinetics while favouring grain enlargement. Post-treatment with formamidinium bromide has been used in several optimised recipes to heal halide vacancies, smooth surface defects, enhance carrier lifetimes, and suppress non-radiative recombination [20]. Equally important is the preparation of the substrate. The TCO substrates, generally ITO-coated glass, are successively cleaned with detergent, deionised water, and isopropanol, treated with ultraviolet ozone to remove organic residues and improve wettability [6]. The HTL is then deposited, typically a soul–gel–derived NiOx film that offers superior energy alignment and chemical compatibility with perovskites [3]. Researchers found that doping a small amount of CsI into NiOx improved the film's crystallinity and reduced the number of interface trap states [11]. The perovskite active layer is put down using a two-step spin-coating process [17]. To spread the precursor solution, it is spun slowly (about 1000 rpm) to achieve a uniform thickness, then spun quickly (about 4000 rpm) [2]. During the last few seconds of spinning, a non-polar antisolvent such as chlorobenzene or anisole is dripped onto the surface to accelerate crystallisation by pulling the solvent out [3]. After this process, the wet film is heated to 100–120°C for 20–30 minutes to form a uniform, photoactive perovskite phase [5]. In this step, you can optionally do FABr post-treatment by spin-coating with a thin FABr solution (1–3 mg/mL in isopropanol) and then heating International Journal of Emerging Science and Engineering (IJESE) ISSN: 2319–6378 (Online), Volume-13 Issue-12, November 2025 20 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number:100.1/ijese.L262513121125 DOI:10.35940/ijese.L2625.13121125 Journal Website: www.ijese.org it for a short time [6]. This promotes uniform halides, lattice passivation, and improved protection against moisture [7]. To get the charge out, the whole device stack is built up by putting down ETLs one at a time. These are usually C₆₀ (about 20 nm), a thin BCP interlayer (about 6–8 nm), and a reflective Ag or Au top contact (about 100 nm), all deposited by thermal evaporation. To protect the device from oxygen and moisture, it is crucial to encapsulate it in an inert nitrogen atmosphere with UV-curable epoxy and a glass coverslip. Instead of spin coating, blade coating or slot-die printing can be used for large-area fabrications. This allows depositing films on heated substrates while controlling solvent evaporation [8]. This method yields dense, pinhole-free films with high crystallinity and improved environmental stability. XRD, UV-Vi’s spectroscopy, PL, and SEM indicate that blackphase perovskites have formed and that the movies are uniform in shape. Optimised Cs-FA-MA Pb(I,Br)₃ films exhibit high absorption, long carrier diffusion lengths, and low trap densities. This means that single-junction configurations have PCEs above 25%, while tandem architectures have PCEs above 34%. This synthesis method is the best approach for making high-performance, stable, scalable, and efficient mixed-cation, mixed-halide hybrid perovskite solar cells [9]. IV. RESULT AND DISCUSSION A lot of research has been done on mixed-cation, mixedhalide hybrid perovskite solar cells, and it shows that adding both inorganic and organic A-site cations makes the cells much more stable, with better optoelectronic properties, and more resistant to environmental conditions [10]. The most studied system, CsₓFAᵧMA₁₋ₓ₋ᵧPb(I₁₋zBrz)₃, is an excellent example of how changing the composition can change the crystallographic phase, the defect landscape, and the dynamics of charge carriers [11]. X-ray diffraction (XRD) and grazing-incidence wide-angle X-ray scattering analyses have consistently validated that the yellow, non-photoactive δ-phase of formamidinium lead iodide is inhibited upon the incorporation of a minor fraction of caesium and bromine. Adding an inorganic Cs⁺ ion reduces the lattice size and the degree of octahedral distortion, thereby making the black phase more stable, even at high humidity. Also, adding mixed halides increases the optical bandgap to 1.65–1.75 eV, raising the open-circuit voltage and enabling the use of silicon bottom cells in tandem architectures [13]. Microscopic and spectroscopic analyses demonstrate significant improvements in film morphology and electronic uniformity. SEM characterisations show that triple-cation perovskites can make larger grains, about 500–800 nm in size, with fewer pinholes than single-cation perovskites. This increase in grain size is associated with lower trap density and longer carrier diffusion lengths, as shown by TRPL and SCLC measurements. Treatment with or addition of formamidinium bromide during or after film formation further promotes surface passivation, as evidenced by longer carrier lifetimes exceeding one µs and narrower Urbach energies below 15 meV. These signatures suggest a modest decrease in non-radiative recombination, which should directly improve device efficiency and stability [14]. Optoelectronic characterisation has demonstrated a notable enhancement in the quasi-Fermi level splitting (QFLS), approaching the radiative limit for these materials. Steadystate photoluminescence (PL) spectra of mixed-halide triplecation perovskites exhibit blue-shifted, stronger emission than that of binary or single-cation analogues. This means that charge transport is more balanced and there are fewer deep traps. Ultraviolet photoelectron spectroscopy (UPS) and Kelvin-probe studies show that the valence and conduction bands are better aligned at the interfaces with NiOx and C₆₀, respectively. This makes it easier to extract carriers and reduces hysteresis. Devices using Cs-modified NiOx exhibit higher fill factors (FF ≈ 82–84%) and open-circuit voltages up to 1.24 V, underscoring the importance of aligning energy levels at the interface [15]. Nevertheless, photo-induced halide segregation remains one of the most frequently discussed concerns. Under constant light irradiance, iodide and bromide ions may drift, resulting in local composition gradients that cause a redshift in photoluminescence and/or a decrease in VOC. However, with entropy-rich compositions and effective strain management, this process is considerably delayed. In situ PL mapping and light-bias EQE tracking reveal that minimising surface strain and halide disorder can suppress phase separation for several hours of operation. Compositional engineering, incorporation of large organic cations at the grain boundaries, and robust encapsulation have also recently been shown to restrain ionic migration [16]. Electrical characterisation under one-sun illumination has revealed PCEs of over 25% for single-junction inverted architectures and has provided evidence of stabilised output via MPP tracking. The Voc deficit, quantified by (Eg/q - Voc), was pushed below 0.35 V, which means near-ideal radiative efficiency. In this context, wide-bandgap perovskites (≈1.7 eV) in tandem with crystalline silicon have reported certified efficiencies as high as 34.9%, which is a massive leap beyond the Shockley-Queisser limit for singlejunction photo-voltaic conversion. Performance milestones are summarised in the NREL 2025 efficiency chart, where perovskite-based tandems stand alongside the world's highest-efficiency photovoltaic devices [17]. ISOS protocol stability tests confirm that, when properly encapsulated, the TCMH cells can retain more than 90% of their initial efficiency under continuous illumination at 65°C for 1000 hours. Degradation analyses suggest that most residual performance losses are due to interfacial reactions between the perovskite and charge-transport layers, rather than intrinsic perovskite decomposition [18]. These have now been mitigated with strategies such as inserting ultrathin ALD-SnOₓ or poly-Si tunneling recombination layers. The results show that triple-cation, mixed-halide perovskites strike a delicate balance between their electronic performance and structural strength [19]. They deliver strong absorption in the visible range, long carrier diffusion lengths, and minimal trap-assisted recombination, while maintaining tolerance for thermal and environmental stress. Correspondingly, the synergistic roles of Cs⁺ incorporation, Br⁻ substitution, and post-treatment passivation converge in high-efficiency devices that are steadily increasing toward commercial Toward Stable and Efficient Mixed-Cation Mixed-Halide Perovskite Solar Cells 21 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number:100.1/ijese.L262513121125 DOI:10.35940/ijese.L2625.13121125 Journal Website: www.ijese.org reliability. Further tuning of the composition, interfacial chemistry, and encapsulation process, permitting AI-guided process optimisation, continues to enhance efficiency and operational lifetime, moving these materials toward largescale, next-generation photovoltaic deployment [20]. V. CONCLUSION In modern photovoltaics, hybrid perovskites with mixed cation-halide compositions have emerged as a breakthrough technology owing to their exceptional balance of efficiency, stability, and tunability. Incorporation of more than one Asite cation like Cs⁺, FA⁺, and MA⁺ with halides I⁻ and Br⁻ tends to stabilise the perovskite lattice, improve film quality, and allow bandgap control suitable for single-junction and tandem applications. Surface passivation and interfacial engineering further enhance device durability by reducing defects. Recently, power conversion efficiencies of about 27% for single-junction cells and 34.9% for perovskite/silicon tandem cells have been realised, providing a new benchmark for thin-film solar technologies. Compositional tuning, encapsulation, and advanced process control have progressively mitigated the challenges of ion migration and halide segregation. This perspective considers triple-cation, mixed-halide perovskites as one of the best routes toward highly efficient, low-cost, stable solar cells. Continued research on scalable fabrication, improved stability, and AI-assisted optimisation is up-and-coming to accelerate further the transition of these devices from laboratory prototypes to commercial solar technologies. DECLARATION STATEMENT After aggregating input from all authors, I must verify the accuracy of the following information as the article's author. ▪ Conflicts of Interest/ Competing Interests: Based on my understanding, this article has no conflicts of interest. ▪ Funding Support: This article has not been funded by any organizations or agencies. This independence ensures that the research is conducted with objectivity and without any external influence. ▪ Ethical Approval and Consent to Participate: The content of this article does not necessitate ethical approval or consent to participate with supporting documentation. ▪ Data Access Statement and Material Availability: The adequate resources of this article are publicly accessible. ▪ Author’s Contributions: The authorship of this article is contributed equally to all participating individuals. REFERENCES 1. W. Tan, A. R. Bowring, A. C. Meng, M. D. McGehee, and P. C. McIntyre, “Thermal stability of mixed cation metal halide perovskites in air,” ACS Applied Materials & Interfaces, vol. 10, no. 6, pp. 5485–5491, 2018. DOI: https://doi.org/10.1021/acsami.7b15263 2. J. Xing, Y. Sun, S. He, X. Huang, Y. Li, Z. Huang, B. Wang, R. Zhou, Y. Li, J. Zhang, and P. 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DOI: https://doi.org/10.13005/ojc/400414 17. S.C. Pradhan, M. Kumar, S. Yadav, B. Hirwani and A. Verma, “Enhancing efficiency, reducing environmental impact, and ensuring life cycle sustainability in sustainable solar energy through nanomaterial innovations,” Educational Administration: Theory and Practice, 2024, Vol. 30, No. 11, pp. 399–405. DOI: https://doi.org/10.53555/kuey.v30i11.8538 18. A. Thakur, P. Chandrakar, D. Tirkey and A. Verma, “Structural and dielectric studies of lead-free BCZT, BNT-0.06BT, and related ceramics,” International Journal of All Research Education and Scientific Methods, 2025, Vol. 13, No. 4, pp. 3268–3271. DOI: https://doi.org/10.56025/IJARESM.2025.1304253268 19. A. Verma, A.K. Diwakar and R.P. Patel, “Characterization of CH₃CH₂NH₃SnI₃/TiO₂ heterojunction: Lead-free perovskite solar cells,” in Emerging Materials and Advanced Designs for Wearable Antennas, IGI Global, 2021, pp. 149–153. DOI: https://doi.org/10.4018/978-1-7998-7103-3.ch010 20. A. Verma, R. Tiwari, S. Jain and P. Goswami, “Integration of flexible perovskite solar cells with wearable antennas for sustainable and efficient wearable electronics,” in Design and Simulation of International Journal of Emerging Science and Engineering (IJESE) ISSN: 2319–6378 (Online), Volume-13 Issue-12, November 2025 22 Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP) © Copyright: All rights reserved. Retrieval Number:100.1/ijese.L262513121125 DOI:10.35940/ijese.L2625.13121125 Journal Website: www.ijese.org Wearable Antennas for Healthcare, IGI Global, 2025, pp. 249–266. DOI: https://doi.org/10.4018/978-1-6684-9741-7.ch012 AUTHOR’S PROFILE Gulab Singh Verma is a research scholar specialising in “Development of Stable Mixed-Cation Mixed-HalideBased Hybrid High-Performance Perovskite Solar Cells.” He focuses on enhancing the efficiency and long-term stability of perovskite solar devices through compositional and structural engineering. He holds an M.Sc. in Electronics and Photonics and a B.Sc. in Mathematics from Pt. Ravishankar Shukla University, Raipur. His research interests include renewable energy materials, semiconductor physics, and sustainable device fabrication. Gulab has authored scientific articles in reputable journals and actively promotes science communication and education. Divya Tripathy holds an M.Sc. and M.Phil. in Physics, with a focus on high-performance, stable perovskite solar cells. Her ongoing research centres on “Stable and High-Performance Perovskite Solar Cells with Improved Charge Transport for Sustainable Energy Progress.” She has participated in numerous national and international conferences and workshops, advancing the development of photovoltaic materials and sustainable energy technologies. Her scholarly pursuits encompass thin-film fabrication, charge transport mechanisms, and the enhancement of solar cell stability. Puspanjali Hota possesses an M.Sc. and M.Phil. in Physics and is presently researching “Interface Optimisation and Long-Term Stability of Perovskite– Silicon Heterojunction Solar Cells.” Her research focuses on optimising device interfaces, enhancing charge-carrier dynamics, and ensuring stability in next-generation hybrid solar cells. She has actively engaged in national and international conferences and workshops, contributing to photovoltaic research and sustainable energy materials. Her scholarly pursuits encompass semiconductor device engineering, thin-film deposition methods, and advanced characterisation of hybrid solar cell structures. Shashikant is pursuing a PhD in Physics from Kalinga University, Naya Raipur. His research focuses on “Development of Stable Mixed-Cation Mixed-HalideBased Hybrid High-Performance Perovskite Solar Cells.” He has completed his M.Sc. in Physics, with strong interests in nanotechnology, solar cell engineering, and material science. He has authored several book chapters and research papers on topics including CdTe solar cells, nanomaterials, and surface plasmon resonance-based technologies. His academic pursuits focus on advancing renewable energy materials and innovative applications in sustainable energy and photonic systems. Toleshwar Prasad Rajwade is pursuing a PhD in Physics at Kalinga University, Naya Raipur, focusing on “Theoretical Investigation of Band Structure Engineering in Rare Earth Doped CdTe for Enhanced Photovoltaic Absorption.” His research interests include semiconductor physics, photovoltaic materials, and bandstructure modelling. With over 13 years of teaching experience in physics and materials science, he has contributed to academic development through seminars, mentorship, and curriculum enhancement. He possesses strong analytical, computational, and scientific writing skills, aiming to advance innovation in renewable energy and semiconductor research. Dr. Aloke Verma, is an Assistant Professor and Head of the Department of Physics at Kalinga University, Naya Raipur, Chhattisgarh, India. He has over 14 years of teaching and research experience in Material Science, Condensed Matter Physics, Environmental Science and Renewable Energy. His research interests include Perovskite and CdTe-based Solar Cells, Luminescent and Dielectric Materials, and Environmental Physics. Dr Verma has authored more than 70 research papers, seven books, and 14 book chapters, and has presented his work at numerous national and international conferences. He is a supervisor of six PhD scholars, a recipient of multiple awards, including the National Award for Academic Excellence (STAMI, 2024). He serves as a reviewer and editorial board member for several reputable journals. 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