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
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. 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
I. Hossain, A. T. Ngoupo, S. Bhattarai, S. P. Challagulla, and S. K. Sharma
Springer Science and Business Media LLC
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
Sagar Bhattarai, M. Khalid Hossain, Jaya Madan, Rahul Pandey, D.P. Samajdar, Mohd Zahid Ansari, Ismail Hossain, Safa Ezzine, and Mongi Amami
Elsevier BV
Sagar Bhattarai, Rahul Pandey, Jaya Madan, Zahid Ansari, M. Khalid Hossain, Mongi Amami, Shaik Hasane Ahammad, and Ahmed Nabih Zaki Rashed
Wiley
AbstractThe new form of renewable energy attracts enormous attention from researchers for its immense importance and impact on our daily life. A fossil energy is a non‐renewable source that will end shortly because of its immense use in houses and industries. Among the renewable sources, solar cells based on perovskite (PVK) materials exponentially increase their efficiency from 3.8% to 25.8% rapidly in a diminutive period of time. In the present study, doped and undoped PVK layers (MAPbI3, MAPb[I1‐xClx]3) are considered and optimized for solar cell application by using the SCAPS‐1D device simulator. A detailed investigation is done in terms of PVK absorber layer (PAL) thickness variation with different electron and hole transport layers, temperature, and bulk defect density to optimize the device performance. The MAPb(I1‐xClx)3‐based device delivered the highest conversion efficiency of ~29% with JSC of 25.59 mA/cm2, VOC of 1.348 Volt, and an FF of about 83.68%. Results reported in this work may pave the way for the development of advanced high‐efficiency PVK solar cells.
Arvind Sharma, Gaurav Gupta, and Sagar Bhattarai
Springer Science and Business Media LLC
Debashish Pal, Abdulkarem H. M. Almawgani, Soumee Das, Amrindra Pal, Md. Ferdous Rahman, Adam R. H. Alhawari, and Sagar Bhattarai
Royal Society of Chemistry (RSC)
The potential of a BaZrxTi1−xS3-based hybrid solar cell that was expected to integrate the advantages offered by both chalcogenide and perovskite materials as absorbers was investigated in detail.
M. Khalid Hossain, A. A. Arnab, G. F. Ishraque Toki, Sagar Bhattarai, Ahmed M Tawfeek, H. Bencherif, D. K. Dwivedi, Jaya Madan, and Rahul Pandey
American Chemical Society (ACS)
Sagar Bhattarai, G. F. Ishraque Toki, Jaya Madan, Mongi Amami, Rahul Pandey, D. P. Samajdar, Safa Ezzine, Mohd Zahid Ansari, and M. Khalid Hossain
American Chemical Society (ACS)
Dipankar Gogoi, Sagar Bhattarai, and T D Das
Springer Science and Business Media LLC
Md Abdul Monnaf, A K M Mahmudul Haque, Md Hasan Ali, Sagar Bhattarai, Md Dulal Haque, and Md Ferdous Rahman
IOP Publishing
Abstract The current research investigates the (Ni/V2O5/Cu2SnSe3/In2S3/ITO/Al) novel heterostructure of Cu2SnSe3-based solar cell numerically using the SCAPS-1D simulator. The goal of this study is to determine how the proposed cell’s performance will be impacted by the V2O5 hole transport layer and the In2S3 electron transport layer. To enhance cell performances, the effects of thickness, carrier concentration and defect in the absorber layer, electron concentration, hole concentration, total generation and recombination, interface defect, J-V and Q-E characteristics, and operating temperature are investigated. Our preliminary simulation results demonstrate that, in the absence of V2O5 HTL, the efficiency of a conventional Cu2SnSe3 cell is 22.14%, a value that is in suitable agreement with the published experimental values. However, a simulated efficiency of up to 32.34% can be attained by using the HTL and ETL combination of V2O5 and In2S3, respectively, and optimized device parameters. The ideal carrier concentration and layer thickness for the Cu2SnSe3 absorber layer are, 1018 cm−3 and 1000 nm, respectively,. However, it is also seen that for optimum device performances, the back-contact metal work function (BMWF) must be higher than 5.22 eV. The outcomes of this contribution may open up useful research directions for the thin-film photovoltaic sector, enabling the production of high-efficient and low-cost Cu2SnSe3-based PV cells.
Sagar Bhattarai, M. Khalid Hossain, Jaya Madan, Rahul Pandey, D.P. Samajdar, P.K. Kalita, Ahmed Nabih Zaki Rashed, Mohd Zahid Ansari, and Mongi Amami
Elsevier BV