Sagar Bhattarai


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).


PhD in Physics


Condensed Matter Physis, Computational Physics, III-V Semiconductor


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

Scopus Publications


Scholar Citations


Scholar h-index


Scholar i10-index

Scopus Publications


  • Efficiency enhancement of hybrid-solar cell by optimizing CuSCN and V2O5 based dual hole transport layer
    S Bhattarai, P Barman, A Borah, P Sarma, MK Sikdar, P Sarmah, ...
    Solar Energy 275, 112652 2024

  • Unveiling the potential of lead-free Cs2AgBiBr6 (CABB) perovskite for solar cell application
    GS Sahoo, S Bhattarai, E Feddi, M Verma, ANZ Rashed, O Saidani, ...
    Solar Energy Materials and Solar Cells 271, 112873 2024

  • Achieving 24.6% efficiency in 2D perovskite solar cells: Bandgap tuning and MXene contact optimization in (BDA)(MA) n− 1PbnI3n+ 1 structures
    S Gohri, J Madan, DP Samajdar, S Bhattarai, MKA Mohammed, ...
    Chemical Physics Letters 845, 141291 2024

  • Designing a more efficient CsSnI3 based perovskite solar cell with novel bio-synthesized ZnO-NP as ETL
    S Bhattarai
    Materials Chemistry and Physics 318, 129269 2024

  • 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

  • Design and Optimization of High-Performance Novel RbPbBr3-Based Solar Cells with Wide-Band-Gap S-Chalcogenide Electron Transport Layers (ETLs)
    MS Reza, MF Rahman, A Kuddus, MKA Mohammed, D Pal, A Ghosh, ...
    ACS omega 9 (18), 19824-19836 2024

  • Achieving Well-Oriented FAPbI3 Perovskite Photovoltaics by Cyclohexane Modification
    D Dastan, MKA Mohammed, R Sh. Alnayli, S M. Majeed, DS Ahmed, ...
    Langmuir 40 (14), 7560-7568 2024

  • Investigating inorganic perovskite as absorber materials in perovskite solar cells: machine learning analysis and optimization
    N Shrivastav, J Madan, MK Hossain, M KA Mohammed, DP Samajdar, ...
    Physica Scripta 2024

  • Evaluating CZTS Solar Cell Performance Based on Generation and Recombination Models for Possible ETLs Through Numerical Analysis
    PK Dakua, RK Dash, A Laidouci, S Bhattarai, U Dudekula, S Kashyap, ...
    Journal of Electronic Materials, 1-11 2024

  • Tailoring the Hole Transport Layer and Understanding the Impact of Sn Oxidation for Different Mixed Halide Perovskite Active Layers: On a Quest for the Perfect Match
    S Malhotra, L Gupta, H Nandan, MKA Mohammed, MK Hossain, J Madan, ...
    Energy & Fuels 2024

  • Optimizing lead-free Cs3Bi2I9 perovskite solar cells: exploring absorber and charge transport layers parameters for improved efficiency
    GF Toki, MK Hossain, R Pandey, S Bhattarai, AM Tawfeek, S Mohammad, ...
    Journal of Optics, 1-17 2024

  • Enhancement of efficiency in CsSnI3 based perovskite solar cell by numerical modeling of graphene oxide as HTL and ZnMgO as ETL
    S Bhattarai, MK Hossain, R Pandey, J Madan, DP Samajdar, ...
    Heliyon 10 (1) 2024

  • Improving the Efficiency of a New Perovskite Solar Cell Based on Sr3SbI3 by Optimizing the Hole Transport Layer
    MS Reza, MF Rahman, A Kuddus, MS Reza, MA Monnaf, MR Islam, ...
    Energy & Fuels 38 (3), 2327-2342 2024

  • Numerical investigation of a high-efficiency BaZr x Ti 1− x S 3 chalcogenide perovskite solar cell
    D Pal, AHM Almawgani, S Das, A Pal, MF Rahman, ARH Alhawari, ...
    New Journal of Chemistry 48 (6), 2474-2483 2024

  • Theoretical electronic and optical properties of AlGaAsN/GaAs quantum well using 10 band kp approach
    A Sharma, G Gupta, S Bhattarai
    Indian Journal of Physics 98 (1), 127-137 2024

  • 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

  • A numerical investigation for performance enhancement of organic solar cell using Al-doped zinc oxide anode
    D Gogoi, S Bhattarai, TD Das
    Indian Journal of Physics, 1-13 2023

  • High-Efficiency Lead-Free La2NiMnO6-Based Double Perovskite Solar Cell by Incorporating Charge Transport Layers Composed of WS2, ZnO, and Cu2FeSnS4
    MK Hossain, AA Arnab, GFI Toki, S Bhattarai, AM Tawfeek, H Bencherif, ...
    Energy & Fuels 37 (24), 19898-19914 2023

  • Design Principles of a Novel Triple Perovskite Absorber for Efficiency Enhancement: An Optimization Study
    S Bhattarai, GFI Toki, J Madan, M Amami, R Pandey, DP Samajdar, ...
    Energy & Fuels 37 (24), 19845-19859 2023

  • Performance improvement of CZTS-based hybrid solar cell with double hole transport layer using extensive simulation
    S Bhattarai, MK Hossain, J Madan, R Pandey, DP Samajdar, PK Kalita, ...
    Journal of Physics and Chemistry of Solids 183, 111641 2023


  • 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: 78

  • 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: 69

  • 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: 58

  • 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: 51

  • 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: 50

  • 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: 48

  • 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: 45

  • 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: 45

  • 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: 39

  • 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: 34

  • 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: 34

  • Optimization of the perovskite solar cell design to achieve a highly improved efficiency
    S Bhattarai, TD Das
    Optical Materials 111, 110661 2021
    Citations: 34

  • 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: 33

  • 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: 32

  • 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: 32

  • Numerical simulation study for efficiency enhancement of doubly graded perovskite solar cell
    S Bhattarai, A Sharma, D Muchahary, D Gogoi, TD Das
    Optical Materials 118, 111285 2021
    Citations: 28

  • Efficiency enhancement of perovskite solar cell by using doubly carrier transport layers with a distinct bandgap of MAPbI3 active layer
    S Bhattarai, A Sharma, TD Das
    Optik 224 (2021), 165430 2020
    Citations: 28

  • 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: 23

  • Carrier transport layer free perovskite solar cell for enhancing the efficiency: A simulation study
    S Bhattarai, A Sharma, D Muchahary, M Gogoi, TD Das
    Optik 243, 167492 2021
    Citations: 20

  • Numerical investigation of toxic free perovskite solar cells for achieving high efficiency
    S Bhattarai, R Pandey, J Madan, GS Sahoo, I Hossain, SM Wabaidur, ...
    Materials Today Communications 35, 105893 2023
    Citations: 19