Sagar Bhattarai
Verified @gmail.com
Assistant Professor and HoD, Department of Physics
Arunachal University of Studies
Dr. Sagar Bhattarai was born in T.K. Grant (North Guwahati). He is an expert in optoelectronic devices. His research area is Organic Solar Cells, Perovskite Solar Cells, OLED, and III-V semiconductors. He has published more than 20 research papers in various international and national journals till now. He is currently working as an Assistant Professor of Physics at Arunachal University of Studies, Namsai, Arunachal Pradesh (India).
EDUCATION
PhD in Physics
RESEARCH INTERESTS
Condensed Matter Physis, Computational Physics, III-V Semiconductor
FUTURE PROJECTS
Perovskite solar cells
Researchers worldwide have been interested in perovskite solar cells (PSCs) due to their exceptional photovoltaic (PV) performance. The PSCs are the next generation of the PV market as they can produce power with performance that is on par with the best silicon solar cells while costing less than silicon solar cells. The efficiency of PSCs has increased from 3.81% to 25.7% within a decade, demonstrating their immense potential. In this review, the advantages of PSCs and the evolution of efficiency with various configuration are summarized and discussed. The manufacture of PSCs on a large scale and the fabrication of perovskite films are described as well. Despite their advantages, PSCs have encountered numerous problems, including toxicity and degradation in the presence of moisture, oxygen, and UV light. Thus, we emphasize this line added to the difficulties preventing the commercialization of PSCs, as well as the road map towards commercialization are thoroughly examined.
Applications Invited
Renewable Energy
Applications Invited
Tandem solar cell, Quantum Dot solar cell
Applications Invited
100
Scopus Publications
2164
Scholar Citations
25
Scholar h-index
50
Scholar i10-index
Scopus Publications
- Investigation of dual absorbers with novel MXene doped perovskite for Extraordinary performance of perovskite solar cells
Sagar Bhattarai, K. Deepthi Jayan, Prakash Kanjariya, Pawan Sharma, Ramneet Kaur, Jaya Madan, Mohd Zahid Ansari, Saikh Mohammad Wabaidur, and Rahul Pandey
Elsevier BV - Exploring deep learning methods for solar photovoltaic power output forecasting: A review
Dheeraj Kumar Dhaked, V.L. Narayanan, Ram Gopal, Omveer Sharma, Sagar Bhattarai, and S.K. Dwivedy
Elsevier BV - Introducing a sustainable strontium-based double perovskite solar cell exceeding 32 % efficiency for advanced solar technology
Basra Sultana, Abu Bakkar, Okba Saidani, Sagar Bhattarai, Ahmad Irfan, and Md. Ferdous Rahman
Elsevier BV - Density functional theory based computation of the optoelectronic properties of double perovskites A<inf>2</inf>InAgBr<inf>6</inf> (A= Na, Cs, Rb, and K) and their performance assessment as absorber for photovoltaic applications
Gagan Kumar, Babban Kumar Ravidas, Sagar Bhattarai, Mukesh Kumar Roy, and Dip Prakash Samajdar
Elsevier BV - A review on perovskite materials for photovoltaic applications
Lalruat Sanga, Celestine Lalengmawia, Zosiamliana Renthlei, Sougaijam Thasana Chanu, Lalhum Hima, Ningthoujam Surajkumar Singh, Andre Yvaz, Sagar Bhattarai, and D.P. Rai
Elsevier BV - High-efficiency GaAs solar cells with ordered nano-conical frustum arrays for enhanced light trapping and photovoltaic performance
Sumit Sagar, Sagar Bhattarai, Jitendra Kumar, Amitesh Kumar, and Samrat Mukhopadhyay
Elsevier BV - Empirical survey on the effect of straight and wavy fins integrated with wind stream as heat sink of photovoltaic panels
I. Hossain, A. T. Ngoupo, S. Bhattarai, S. P. Challagulla, and S. K. Sharma
Springer Science and Business Media LLC - Achieving Quasi-Fermi level splitting near its radiative limit in efficient and stable 2D/3D perovskite solar Cells: Detailed balance model
Qoteyba Aouni, Souhil Kouda, Khalid Mujasam Batoo, Muhammad Farzik Ijaz, Girija Shankar Sahoo, Sagar Bhattarai, P. Sasikumar, and Hichem Bencherif
Elsevier BV - A Parametric Analysis of CZTS/CdTe Heterostructure Solar Cell Based on SCAPS 1D
Pratap Kumar Dakua, Neravati Nagaraja Kumar, Subbulakshmi Ganesan, Junainah Abd Hamid, M. Ravi Kumar, Suman Saini, Piyus Kumar Pathak, Ahmed Alkhayyat, and Sagar Bhattarai
Springer Science and Business Media LLC - Observation of voltage dependent negative differential resistance (NDR) in SnS<inf>2</inf>-GO nanocomposites
Lohnye Tangjang, Anubhab Parashar Gogoi, Hirendra Das, Sagar Bhattarai, and P.K. Kalita
Elsevier BV - Integration of SCAPS-1D and density functional theory for the performance evaluation of RbGeI<inf>3</inf>-based perovskite solar cell
Babban Kumar Ravidas, Ajmera Raj Kumar, Azmeera Praveen, Suneet Kumar Agnihotri, Sagar Bhattarai, Rahul Pandey, Jaya Madan, Shailendra Singh, M. Khalid Hossain, Mukesh Kumar Roy,et al.
Elsevier BV - Modeling organic electron transport layers in mixed cation tin-based perovskite solar cells
Ayush Tara, Ananta Paul, Abhijit Singha, Shivani Gohri, Jaya Madan, Rahul Pandey, Praveen Kumar, Ismail Hossain, and Sagar Bhattarai
Springer Science and Business Media LLC - Band offset optimization in MAGeI<inf>3</inf> based perovskite solar cells
K. Deepthi Jayan and Sagar Bhattarai
Elsevier BV - Bio-synthesized ZnO in cesium based perovskite solar cells: A pathway to sustainable high efficiency
Sagar Bhattarai, Mustafa K.A. Mohammed, Ismail Hossain, Pratap Kumar Dakua, Rahul Pandey, and Jaya Madan
Elsevier BV - DFT and SCAPS-1D based optimization study of double perovskite Cs<inf>2</inf>AuBiCl<inf>6</inf> solar cells utilizing different charge transport layers
Omkar Rajendra Lunge, Babban Kumar Ravidas, Sagar Bhattarai, Rahul Pandey, Jaya Madan, Mukesh Kumar Roy, M. Khalid Hossain, and Dip Prakash Samajdar
Elsevier BV - Toward Sustainable Water Solutions: A Review of Nanomaterials for Solar-Driven Water Harvesting
Amrit Kumar Thakur, Soumya Kanti Hazra, Ahmed Mortuza Saleque, Sagar Bhattarai, Jang-Yeon Hwang, and Md Shamim Ahamed
American Chemical Society (ACS) - Optimizing lead-free Cs<inf>3</inf>Bi<inf>2</inf>I<inf>9</inf> perovskite solar cells: exploring absorber and charge transport layers parameters for improved efficiency
G. F. Ishraque Toki, M. Khalid Hossain, Rahul Pandey, Sagar Bhattarai, Ahmed M. Tawfeek, Saikh Mohammad, A. M. J. Habib, Nayeem Mahmud, Md. Ferdous Rahman, P. Sasikumar,et al.
Springer Science and Business Media LLC - Revealing the secrets of high performance lead-free CsSnCl<inf>3</inf> based perovskite solar cell: A dive into DFT and SCAPS-1D numerical insights
Okba Saidani, Abderrahim Yousfi, D.P. Samajdar, Xueqing Xu, Taye Biniyam Zemene, Sagar Bhattarai, M Khalid Hossain, and Girija Shankar Sahoo
Elsevier BV - Optimization of efficiency of CZTS-based solar cell through exclusive BSF layer engineering method
Pratap Kumar Dakua, Youssef Trabelsi, Usen Dudekula, Rajesh Tripathi, Sadanand, Abdelmoumene Laidouci, Amrindra Pal, Deepak Kumar Panda, Rajesh Kumar Misra, and Sagar Bhattarai
Elsevier BV - Unveiling the potential of lead-free Cs<inf>2</inf>AgBiBr<inf>6</inf> (CABB) perovskite for solar cell application
G.S. Sahoo, S. Bhattarai, E. Feddi, M. Verma, A.N.Z. Rashed, O. Saidani, and G.P. Mishra
Elsevier BV - A numerical investigation for performance enhancement of organic solar cell using Al-doped zinc oxide anode
Dipankar Gogoi, Sagar Bhattarai, and T. D. Das
Springer Science and Business Media LLC - Achieving 24.6 % efficiency in 2D perovskite solar cells: Bandgap tuning and MXene contact optimization in (BDA)(MA)<inf>n−1</inf>Pb<inf>n</inf>I<inf>3n+1</inf> structures
Shivani Gohri, Jaya Madan, D.P. Samajdar, Sagar Bhattarai, Mustafa K.A. Mohammed, M. Khalid Hossain, Md. Ferdous Rahman, Ali K. Al-Mousoi, Essam A. Al-Ammar, and Rahul Pandey
Elsevier BV - Efficiency enhancement of hybrid-solar cell by optimizing CuSCN and V<inf>2</inf>O<inf>5</inf> based dual hole transport layer
Sagar Bhattarai, Pranjal Barman, Anindita Borah, Pratiksha Sarma, Mrinal Kanti Sikdar, Pallab Sarmah, D.P. Samajdar, and Jaya Madan
Elsevier BV - Investigating of novel inorganic cubic perovskites of A<inf>3</inf>BX<inf>3</inf> (A=Ca, Sr, B[dbnd]P, As, X=I, Br) and their photovoltaic performance with efficiency over 28%
Avijit Ghosh, Md. Ferdous Rahman, Abdul Kuddus, Mustafa K.A. Mohammed, Md. Rasidul Islam, Sagar Bhattarai, Aijaz Rasool Chaudhry, and Ahmad Irfan
Elsevier BV - Design and Optimization of High-Performance Novel RbPbBr<inf>3</inf>-Based Solar Cells with Wide-Band-Gap S-Chalcogenide Electron Transport Layers (ETLs)
Md. Selim Reza, Md. Ferdous Rahman, Abdul Kuddus, Mustafa K. A. Mohammed, Debashish Pal, Avijit Ghosh, Md. Rasidul Islam, Sagar Bhattarai, Ibrahim A. Shaaban, and Mongi Amami
American Chemical Society (ACS)
Inorganic cubic rubidium–lead-halide perovskites have attracted considerable attention owing to their structural, electronic, and unique optical properties. In this study, novel rubidium–lead-bromide (RbPbBr3)-based hybrid perovskite solar cells (HPSCs) with several high-band-gap chalcogenide electron transport layers (ETLs) of In2S3, WS2, and SnS2 were studied by density functional theory (DFT) and using the SCAPS-1D simulator. Initially, the band gap and optical performance were computed using DFT, and these results were utilized for the first time in the SCAPS-1D simulator. Furthermore, the impact of different major influencing parameters, that is, the thickness of the layer, bulk defect density, doping concentration, and defect density of interfaces, including the working temperature, were also investigated and unveiled. Further, a study on an optimized device with the most potential ETL (SnS2) layer was performed systematically. Finally, a comparative study of different reported heterostructures was performed to explore the benchmark of the most recent efficient RbPbBr3-based photovoltaics. The highest power conversion efficiency (PCE) was 29.75% for the SnS2 ETL with Voc of 0.9789 V, Jsc of 34.57863 mA cm–2, and fill factor (FF) of 87.91%, while the PCEs of 21.15 and 24.57% were obtained for In2S3 and WS2 ETLs, respectively. The electron–hole generation, recombination rates, and quantum efficiency (QE) characteristics were also investigated in detail. Thus, the SnS2 ETL shows strong potential for use in RbPbBr3-based hybrid perovskite high-performance photovoltaic devices.
RECENT SCHOLAR PUBLICATIONS
- Density functional theory based computation of the optoelectronic properties of double perovskites A2InAgBr6 (A= Na, Cs, Rb, and K) and their performance assessment as absorber
G Kumar, BK Ravidas, S Bhattarai, MK Roy, DP Samajdar
Materials Science in Semiconductor Processing 190, 109269 2025 - A review on perovskite materials for photovoltaic applications
L Sanga, C Lalengmawia, Z Renthlei, ST Chanu, L Hima, NS Singh, ...
Next Materials 7, 100494 2025 - Recent progress in microcrystalline cellulose for solar cell applications: a comprehensive review
J Poudel, S Bhattarai, A Tara, MF Rahman, N Nath, B Tanti
Journal of Optics, 1-15 2025 - High-efficiency GaAs solar cells with ordered nano-conical frustum arrays for enhanced light trapping and photovoltaic performance
S Sagar, S Bhattarai, J Kumar, A Kumar, S Mukhopadhyay
Solar Energy 288, 113299 2025 - A Simulation Investigation of Lead-Free Inorganic CsGeI3-Based Perovskite for Solar Cell with Hole Transport Layers of Different Organic Materials via SCAPS-1D
A Das, BK Ravidas, S Bhattarai, R Pandey, J Madan, MK Hossain, ...
Nanomaterials for Sensors and Sustainable Energy Volume 1, 123-152 2025 - Introducing a sustainable strontium-based double perovskite solar cell exceeding 32% efficiency for advanced solar technology
B Sultana, A Bakkar, O Saidani, S Bhattarai, A Irfan, MF Rahman
Journal of Physics and Chemistry of Solids, 112582 2025 - Investigation of Dual Absorbers with Novel MXene doped Perovskite for Extraordinary Performance of Perovskite Solar Cells
S Bhattarai, KD Jayan, P Kanjariya, P Sharma, R Kaur, J Madan, ...
Journal of Physics and Chemistry of Solids, 112643 2025 - Exploring the landscape of deep learning for solar photovoltaic power output forecasting: A review
DK Dhaked, VL Narayanan, R Gopal, O Sharma, S Bhattarai, SK Dwivedy
Renewable Energy Focus, 100682 2025 - Achieving Quasi-Fermi level splitting near its radiative limit in efficient and stable 2D/3D perovskite solar Cells: Detailed balance model
Q Aouni, S Kouda, KM Batoo, MF Ijaz, GS Sahoo, S Bhattarai, ...
Solar Energy 286, 113144 2025 - Observation of voltage dependent negative differential resistance (NDR) in SnS2-GO nanocomposites
L Tangjang, AP Gogoi, H Das, S Bhattarai, PK Kalita
Physica E: Low-dimensional Systems and Nanostructures 165, 116102 2025 - Integration of SCAPS-1D and density functional theory for the performance evaluation of RbGeI3-based perovskite solar cell
BK Ravidas, AR Kumar, A Praveen, SK Agnihotri, S Bhattarai, R Pandey, ...
Journal of Physics and Chemistry of Solids 196, 112325 2025 - A Parametric Analysis of CZTS/CdTe Heterostructure Solar Cell Based on SCAPS 1D
PK Dakua, NN Kumar, S Ganesan, JA Hamid, MR Kumar, S Saini, ...
Journal of Electronic Materials, 1-10 2024 - Assessment of double CdS/CdTe based solar cells using carbon as back contact: an exclusive optimization method
S Bhattarai, AA Jrai, J Kaur, JA Hamid, PK Dakua, J Madan, R Pandey
Journal of Optics, 1-12 2024 - All Inorganic Cesium-Based Dual Light Absorber For Efficiency Enhancement In Solar Cells
S Bhattarai, P Kanjariya, KS Kiran, R Sharma, S Jaidka, N Shrivastav, ...
Journal of Optics, 1-10 2024 - Modeling organic electron transport layers in mixed cation tin-based perovskite solar cells
A Tara, A Paul, A Singha, S Gohri, J Madan, R Pandey, P Kumar, ...
Journal of Nanoparticle Research 26 (12), 1-12 2024 - Bio-synthesized ZnO in cesium based perovskite solar cells: a pathway to sustainable high efficiency
S Bhattarai, MKA Mohammed, I Hossain, PK Dakua, R Pandey, J Madan
Solid State Communications 393, 115671 2024 - DFT and SCAPS-1D based optimization study of double perovskite Cs2AuBiCl6 solar cells utilizing different charge transport layers
OR Lunge, BK Ravidas, S Bhattarai, R Pandey, J Madan, MK Roy, ...
Journal of Physics and Chemistry of Solids 195, 112260 2024 - Systematic Optimization of InBi2S4Cl Absorber Layer in Perovskite Solar Cells for Enhanced Photovoltaic Performance
N Shrivastav, S Bhattarai, J Madan, H Alabdeli, R Pandey
2024 IEEE International Conference of Electron Devices Society Kolkata 2024 - Enhancing efficiency in organic solar device with exclusive study using PC-1D simulator
A Sharma, S Ghosh, B Kalita, A Kashyap, A Kumar, J Kaur, M Akkur, ...
Journal of Optics, 1-8 2024 - Facile synthesis of chitosan-MoS2 over reduced graphene oxide to improve photocatalytic degradation of methylene blue
MKA Mohammed, AM Naji, DS Ahmed, MJ Jamai, EY Salih, ...
Journal of Sol-Gel Science and Technology, 1-11 2024
MOST CITED SCHOLAR PUBLICATIONS
- Numerical Analysis in DFT and SCAPS-1D on the Influence of Different Charge Transport Layers of CsPbBr3 Perovskite Solar Cells
MK Hossain, MKA Mohammed, R Pandey, AA Arnab, MHK Rubel, ...
Energy & Fuels 37 (8), 6078-6098 2023
Citations: 160 - Optimization of carrier transport materials for the performance enhancement of the MAGeI3 based perovskite solar cell
S Bhattarai, TD Das
Solar Energy 217, 200-207 2021
Citations: 102 - Halide composition engineered a non-toxic perovskite–silicon tandem solar cell with 30.7% conversion efficiency
R Pandey, S Bhattarai, K Sharma, J Madan, AK Al-Mousoi, ...
ACS Applied Electronic Materials 5 (10), 5303-5315 2023
Citations: 100 - Photovoltaic Performance Investigation of Cs3Bi2I9-Based Perovskite Solar Cells with Various Charge Transport Channels Using DFT and SCAPS-1D Frameworks
MK Hossain, GF Ishraque Toki, DP Samajdar, MHK Rubel, M Mushtaq, ...
Energy & Fuels 37 (10), 7380-7400 2023
Citations: 98 - Harnessing the potential of CsPbBr 3-based perovskite solar cells using efficient charge transport materials and global optimization
MK Hossain, S Bhattarai, AA Arnab, MKA Mohammed, R Pandey, MH Ali, ...
RSC advances 13 (30), 21044-21062 2023
Citations: 92 - Achieving above 24% efficiency with non-toxic CsSnI 3 perovskite solar cells by harnessing the potential of the absorber and charge transport layers
MK Hossain, MS Uddin, GFI Toki, MKA Mohammed, R Pandey, J Madan, ...
RSC advances 13 (34), 23514-23537 2023
Citations: 81 - Optimization of the architecture of lead-free CsSnCl3-perovskite solar cells for enhancement of efficiency: a combination of SCAPS-1D and wxAMPS study
MK Hossain, GFI Toki, A Kuddus, MKA Mohammed, R Pandey, J Madan, ...
Materials Chemistry and Physics 308, 128281 2023
Citations: 78 - Design Insights into La2NiMnO6-Based Perovskite Solar Cells Employing Different Charge Transport Layers: DFT and SCAPS-1D Frameworks
MK Hossain, AA Arnab, DP Samajdar, MHK Rubel, MM Hossain, ...
Energy & Fuels 37 (17), 13377-13396 2023
Citations: 73 - Investigation of Carrier Transport Materials for Performance Assessment of Lead-Free Perovskite Solar Cells
S Bhattarai, R Pandey, J Madan, A Mhamdi, A Bouazizi, D Muchahary, ...
IEEE Transactions on Electron Devices 2022 (0018-9383), 1-8 2022
Citations: 72 - A comprehensive study of the optimization and comparison of cesium halide perovskite solar cells using ZnO and Cu 2 FeSnS 4 as charge transport layers
MK Hossain, GFI Toki, J Madan, R Pandey, H Bencherif, MKA Mohammed, ...
New Journal of Chemistry 47 (18), 8602-8624 2023
Citations: 71 - A detailed review of perovskite solar cells: Introduction, working principle, modelling, fabrication techniques, future challenges
S Bhattarai, A Mhamdi, I Hossain, Y Raoui, R Pandey, J Madan, ...
Micro and Nanostructures 172, 207450 2022
Citations: 67 - Exploring the impact of strain on the electronic and optical properties of inorganic novel cubic perovskite Sr3PI3
MF Rahman, M Harun-Or-Rashid, MR Islam, A Ghosh, MK Hossain, ...
Physica Scripta 98 (11), 115105 2023
Citations: 66 - Perovskite solar cells with dual light absorber layers for performance efficiency exceeding 30%
S Bhattarai, MK Hossain, R Pandey, J Madan, DP Samajdar, MF Rahman, ...
Energy & Fuels 37 (14), 10631-10641 2023
Citations: 64 - Boosting efficiency above 28% using effective charge transport layer with Sr 3 SbI 3 based novel inorganic perovskite
MS Reza, MF Rahman, A Kuddus, MKA Mohammed, AK Al-Mousoi, ...
RSC advances 13 (45), 31330-31345 2023
Citations: 60 - Investigating of novel inorganic cubic perovskites of A3BX3 (A= Ca, Sr, BP, As, X= I, Br) and their photovoltaic performance with efficiency over 28%
A Ghosh, MF Rahman, A Kuddus, MKA Mohammed, MR Islam, ...
Journal of Alloys and Compounds 986, 174097 2024
Citations: 52 - A novel graded approach for improving the efficiency of Lead-Free perovskite solar cells
S Bhattarai, R Pandey, J Madan, D Muchahary, D Gogoi
Solar Energy 244, 255-263 2022
Citations: 47 - Performance improvement approach of all inorganic perovskite solar cell with numerical simulation
S Bhattarai, R Pandey, J Madan, F Ahmed, S Shabnam
Materials Today Communications 33, 104364 2022
Citations: 46 - Optimizing the performance of Cs2AgBiBr6 based solar cell through modification of electron and hole transport layers
N Shrivastav, J Madan, MKA Mohammed, AK Al-Mousoi, MK Hossain, ...
Materials Today Communications 36, 106761 2023
Citations: 40 - Structural, electronic and optical characteristics of inorganic cubic perovskite Sr3AsI3
A Ghosh, MF Rahman, MR Islam, MS Islam, M Khalid Hossain, ...
Optics Continuum 2 (10), 2144-2153 2023
Citations: 38 - Boosting efficiency above 30% of novel inorganic Ba3SbI3 perovskite solar cells with potential ZnS electron transport layer (ETL)
MF Rahman, MNH Toki, A Kuddus, MKA Mohammed, MR Islam, ...
Materials Science and Engineering: B 300, 117073 2023
Citations: 37