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
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Lohnye Tangjang, Anubhab Parashar Gogoi, Hirendra Das, Sagar Bhattarai, and P.K. Kalita
Elsevier BV
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
K. Deepthi Jayan and Sagar Bhattarai
Elsevier BV
Sagar Bhattarai, Mustafa K.A. Mohammed, Ismail Hossain, Pratap Kumar Dakua, Rahul Pandey, and Jaya Madan
Elsevier BV
Omkar Rajendra Lunge, Babban Kumar Ravidas, Sagar Bhattarai, Rahul Pandey, Jaya Madan, Mukesh Kumar Roy, M. Khalid Hossain, and Dip Prakash Samajdar
Elsevier BV
Okba Saidani, Abderrahim Yousfi, D.P. Samajdar, Xueqing Xu, Taye Biniyam Zemene, Sagar Bhattarai, M Khalid Hossain, and Girija Shankar Sahoo
Elsevier BV
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
G.S. Sahoo, S. Bhattarai, E. Feddi, M. Verma, A.N.Z. Rashed, O. Saidani, and G.P. Mishra
Elsevier BV
Dipankar Gogoi, Sagar Bhattarai, and T. D. Das
Springer Science and Business Media LLC
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
Sagar Bhattarai, Pranjal Barman, Anindita Borah, Pratiksha Sarma, Mrinal Kanti Sikdar, Pallab Sarmah, D.P. Samajdar, and Jaya Madan
Elsevier BV
Avijit Ghosh, Md. Ferdous Rahman, Abdul Kuddus, Mustafa K.A. Mohammed, Md. Rasidul Islam, Sagar Bhattarai, Aijaz Rasool Chaudhry, and Ahmad Irfan
Elsevier BV
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.
Sagar Bhattarai
Springer Science and Business Media LLC
Davoud Dastan, Mustafa K. A. Mohammed, Raad Sh. Alnayli, Sadeer M. Majeed, Duha S. Ahmed, Ali K. Al-Mousoi, Rahul Pandey, M. Khalid Hossain, Sagar Bhattarai, Bandar Ali Al-Asbahi,et al.
American Chemical Society (ACS)
It is essential and challenging to develop green and cost-effective solar cells to meet the energy demands. Solar cells with a perovskite light-harvesting layer are the most promising technology to propel the world toward next-generation solar energy. Formamidinium lead tri-iodide (FAPbI3)-based perovskite solar cells (F-PSCs), with their considerable performance, offer cost-effective solar cells. One of the major issues that the PSC community is now experiencing is the stability of α-FAPbI3 at relatively low temperatures. In this study, we fabricated FAPbI3-PSCs using cyclohexane (CHX) material via a two-step deposition method. For this purpose, CHX is added to the formamidinium iodide:methylammonium chloride (FAI:MACl) solution as an additive and used to form a better FAPbI3 layer by controlling the reaction between FAI and lead iodide (PbI2). The CHX additive induces the reaction of undercoordinated Pb2+ with FAI material and produces an α-FAPbI3 layer with low charge traps and large domains. In addition, the CHX-containing FAPbI3 layers show higher carrier lifetimes and facilitate carrier transfer in F-PSCs. The CHX-modified F-PSCs yield a high champion efficiency of 22.84% with improved ambient and thermal stability behavior. This breakthrough provides valuable findings regarding the formation of a desirable FAPbI3 layer for photovoltaic applications and holds promise for the industrialization of F-PSCs.
Nikhil Shrivastav, Jaya Madan, M Khalid Hossain, Mustafa K A Mohammed, D P Samajdar, Sagar Bhattarai, and Rahul Pandey
IOP Publishing
Abstract This work investigates the potential of inorganic perovskites AgBiSCl2 and Al2Cu2Bi2S3Cl8 as absorber layers in perovskite solar cells, followed by the application of supervised machine learning models. Extensive exploration and optimization of device architectures FTO/SnO2/AgBiSCl2/Spiro-OMeTAD/Au and FTO/SnO2/Al2Cu2Bi2S3Cl8/Spiro-OMeTAD/Au are conducted, involving variations in absorber layer thickness (d), bulk defect density (Nt), and carrier mobility (μ n,p). The AgBiSCl2-based device achieves an optimized conversion efficiency of 10.06%, while the Al2Cu2Bi2S3Cl8-based device achieves 12.27%. To train different machine learning models, 1600 datasets are collected for each device, and Neural Networks (NN), Random Forests (RF), and XGBoost (XGB) models are employed. The performance parameters, evaluated using mean squared error (MSE) and high R-squared (R2) values, demonstrate that XGB performs the best, achieving an MSE of 0.210 and R2 of 97.1% for AgBiSCl2 and 0.671 and 90.6% for Al2Cu2Bi2S3Cl8. Additionally, the impact of each variable (d, Nt, and μ n,p) on the output is analyzed using Shapley Additive Explanations (SHAP) plots for each model. The results presented in this study pave the way for the advancement of perovskite material-based solar cells without relying on complex optoelectronic semiconducting equations and device simulators.
Shivani Malhotra, Lipika Gupta, Hritik Nandan, Mustafa K. A. Mohammed, M. Khalid Hossain, Jaya Madan, Sagar Bhattarai, Mohd Zahid Ansari, Ayman A. Ghfar, and Rahul Pandey
American Chemical Society (ACS)
Md. Shamim Reza, Md. Ferdous Rahman, Abdul Kuddus, Md. Selim Reza, Md. Abdul Monnaf, Md. Rasidul Islam, Sagar Bhattarai, Samah Al-Qaisi, Lamia Ben Farhat, and Safa Ezzine
American Chemical Society (ACS)
Md. Ferdous Rahman, Md. Naim Hasan Toki, Abdul Kuddus, Mustafa K.A. Mohammed, Md. Rasidul Islam, Sagar Bhattarai, Jaya Madan, Rahul Pandey, Riadh Marzouki, and Mosbah Jemmali
Elsevier BV
Sagar Bhattarai, M. Khalid Hossain, Rahul Pandey, Jaya Madan, D.P. Samajdar, Mithun Chowdhury, Md. Ferdous Rahman, Mohd Zahid Ansari, and Munirah D. Albaqami
Elsevier BV
Amrit Kumar Thakur, Soumya Kanti Hazra, Ahmed Mortuza Saleque, Sagar Bhattarai, Jang-Yeon Hwang, and Md Shamim Ahamed
American Chemical Society (ACS)
Sagar Bhattarai, Pratap Kumar Dakua, Mohd Zahid Ansari, Usen Dudekula, Rahul Pandey, Ismail Hossain, and Ayman A. Ghfar
Springer Science and Business Media LLC
I. Hossain, A. T. Ngoupo, S. Bhattarai, S. P. Challagulla, and S. K. Sharma
Springer Science and Business Media LLC