Sagar Bhattarai

Verified @gmail.com

Scientist & Innovator
Indian Institute of Technology Guwahati



                          

https://researchid.co/sagarbhattarai012

Dr. Sagar Bhattarai is a distinguished scientist, researcher, and innovator at the Indian Institute of Technology Guwahati, where he focuses on cutting-edge photovoltaic and perovskite solar cell technologies. He holds a Ph.D. from the National Institute of Technology Arunachal Pradesh, and has previously served as the Head of the Physics Department at Arunachal University of Studies.
Classified as one of the world’s top 2% scientists by Stanford University (2024), Dr. Bhattarai has contributed extensively to the field of renewable energy, publishing over 50 research papers in top-tier journals. His work involves the development of high-efficiency solar cells, which are critical for the advancement of sustainable energy solutions.
He is also an editor at Springer Nature, and his research focuses on innovative approaches in optoelectronics and solar energy materials. Dr. Bhattarai is passionate about using his expertise to tackle global energy challenges.

EDUCATION

PhD in Physics

RESEARCH, TEACHING, or OTHER INTERESTS

Energy, Fuel Technology, Materials Science, Biomaterials

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
113

Scopus Publications

2521

Scholar Citations

27

Scholar h-index

53

Scholar i10-index

Scopus Publications

RECENT SCHOLAR PUBLICATIONS

  • Governance strategies, policy measures, and regulatory framework for hydrogen energy in India: A comprehensive review
    P Barman, A Kalita, P Sarmah, S Bhattarai, S Bordoloi, F Khalid
    International Journal of Hydrogen Energy 140, 505-518 2025

  • SCAPS Modeling and Improvement of the Characteristics of Cu/ZnO/P3HT/Pt Hybrid Solar Cells with Inorganic Electron Transport Layer
    L Merzougui, M Benhaliliba, S Bhattarai
    Periodica Polytechnica Chemical Engineering 2025

  • Numerical Simulation of High-Efficiency Double-Absorber Layer Perovskite Solar Cells Using SCAPS-1D and MATLAB PV Models
    A Yousfi, O Saidani, R Bennia, FS Saoud, L Saidi, S Bhattarai, MR Islame, ...
    Transactions on Electrical and Electronic Materials 26 (3), 366-379 2025

  • TCAD study of CIGS/CZTS double absorber solar cells for high-efficiency photovoltaic applications
    S Bhattarai, N Shrivastav, L Saikia, PK Kalita, MS Reddy, S Radhika, ...
    Journal of Optics, 1-11 2025

  • Empowering Rubidium-Based Halide PSCs: A Deep Dive into ETL Material Performance
    K Neupane, PK Dakua, JK Sahu, SR Polamuri, A Ved, M Chethan, ...
    Journal of Physics and Chemistry of Solids, 112897 2025

  • Optical and electrical performance study of C2N based solar cell with CZT as an HTL material using SCAPS 1-D simulation tool
    PK Dakua, S Bhattarai, SR Polamuri, A Rajiv, JA Hamid, A Sandhu, ...
    Journal of Optics, 1-11 2025

  • 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

  • Simulation insights into high-efficiency Rb2AlAgI6 hybrid perovskite solar cells: performance metrics and optimization strategies
    O Saidani, A Yousfi, S Bhattarai, MR Islame, GS Sahoo
    Journal of Optics, 1-10 2025

  • An Exclusive Review of Microcrystalline Cellulose: Structure and Applications, and Limitations
    J Poudel, S Bhattarai, N Nath, B Tanti
    Materials Today Communications, 112247 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 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 54 (3), 1841-1850 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

  • Empirical survey on the effect of straight and wavy fins integrated with wind stream as heat sink of photovoltaic panels
    I Hossain, AT Ngoupo, S Bhattarai, SP Challagulla, SK Sharma
    International Journal of Environmental Science and Technology 22 (4), 2479-2492 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

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: 183

  • 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: 109

  • 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: 109

  • 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: 106

  • 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: 105

  • 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: 97

  • 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: 90

  • 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: 88

  • 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: 82

  • 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: 81

  • 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: 75

  • 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: 74

  • 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: 74

  • 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: 70

  • 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: 65

  • 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: 50

  • 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: 49

  • 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: 49

  • 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
    Citations: 44

  • 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: 44

GRANT DETAILS

1. Large scale production of energy from organic solar cell for the utilization in underwater surveillance, from Indian Institute of Technology Guwahati as Principal Investigator, Funding: 19 Lakh INR
2. Development and characterization of CsSnGeI3 based solar cell devices through theoretical and experimental approach, from DST-SERB, Core Research Grant as Co-Principal Investigator, Funding: 49 Lakh INR