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
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.
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
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
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
Sagar Bhattarai, Dharitri Borah, Jayashree Rout, Rahul Pandey, Jaya Madan, Ismail Hossain, Palky Handique, Mohd Zahid Ansari, M. Khalid Hossain, and Md. Ferdous Rahman Royal Society of Chemistry (RSC)
With increased efficiency, simplicity in manufacturing, adaptability, and flexibility, solar cells constructed from organic metal halide perovskite (PVK) have recently attained great eminence.
Sagar Bhattarai, Jaya Madan, Rahul Pandey, Dip Prakash Samajdar, Deboraj Muchahary, Mongi Amami, Safa Ezzine, and M. Khalid Hossain American Chemical Society (ACS)
Nikhil Shrivastav, Vishal Yadav, Sagar Bhattarai, Jaya Madan, M Khalid Hossain, D P Samajdar, D K Dwivedi, and Rahul Pandey IOP Publishing
Abstract Embarking on a journey toward high solar efficiency, this study delves into a two-terminal tandem solar cell (TSC) featuring Sb2S3/Sb2Se3 as an absorber layer. The tandem setup consists of different bandgap (Eg) absorbers to selectively target photon energies: the top cell employs a wide bandgap material to efficiently absorb high-energy photons, while the bottom cell utilizes a lower bandgap material to capture refined photons transmitted from the top cell. This strategy mitigates thermalization and transparent energy losses by assigning distinct photon absorption and conversion roles to the top and bottom cells. Realizing peak efficiency in a tandem configuration rests on the apt choice of active materials for the top and bottom cells. In this regard, a comprehensive study is presented, introducing a TSC architecture that pairs an Sb2S3-based top cell (Eg 1.7 eV) with a Sb2Se3-based bottom cell (Eg 1.2 eV). Through meticulous analysis, the performance of these cells in the tandem setup is analyzed, employing methods such as filtered spectrum analysis and current-matching strategies. The Sb2S3/Sb2Se3 tandem design incorporates a critical tunnel recombination junction facilitated by an ITO layer. Noteworthy is the investigation’s uncovering of impressive metrics for the tandem device, encompassing an open-circuit voltage (VOC) of 1.58 V, a current density (JSC) of 15.50 mA.cm−2, and a fill factor (FF) of 56.90%. This collective attainment culminates in an extraordinary power conversion efficiency of 14%. The insights gleaned from this study hold substantial promise for the future development of monolithic TSC. By adroitly harnessing the distinctive strengths of Sb2S3 and Sb2Se3 materials within a tandem configuration, a clear trajectory is charted toward momentous advancement in solar energy conversion technology.
Md Ferdous Rahman, Md Harun-Or-Rashid, Md Rasidul Islam, Avijit Ghosh, M Khalid Hossain, Sagar Bhattarai, Rahul Pandey, Jaya Madan, M A Ali, and Abu Bakar Md Ismail IOP Publishing
Abstract Inorganic perovskite materials have drawn great attention in the realm of solar technology because of their remarkable structural, electronic, and optical properties. Herein, we investigated strain-modulated electronic and optical properties of Sr3PI3, utilizing first-principles density-functional theory (FP-DFT) in detail. The SOC effect has been included in the computation to provide an accurate estimation of the band structure. At its Г(gamma)-point, the planar Sr3PI3 molecule exhibits a direct bandgap of 1.258 eV (PBE). The application of the spin-orbit coupling (SOC) relativistic effect causes the bandgap of Sr3PI3 to decrease to 1.242 eV. Under compressive strain, the bandgap of the structure tends to decrease, whereas, under tensile strain, it tends to increase. Due to its band properties, this material exhibits strong absorption capabilities in the visible area, as evidenced by optical parameters including dielectric function, absorption coefficient, and electron loss function. The increase in compressive or tensile strain also causes a red-shift or blue-shift behavior in the photon energy spectrum of the dielectric function and absorption coefficient. Finally, the photovoltaic (PV) performance of novel Sr3PI3 absorber-based cell structures with SnS2 as an Electron Transport Layer (ETL) was systematically investigated at varying layer thicknesses using the SCAPS-1D simulator. The maximum power conversion efficiency (PCE) of 28.15% with JSC of 34.65 mA cm−2, FF of 87.30%, and VOC of 0.92 V was found for the proposed structure. Therefore, the strain-dependent electronic and optical properties of Sr3PI3 studied here would facilitate its future use in the design of photovoltaic cells and optoelectronics.
Md. Shamim Reza, Md. Ferdous Rahman, Abdul Kuddus, Mustafa K. A. Mohammed, Ali K. Al-Mousoi, Md. Rasidul Islam, Avijit Ghosh, Sagar Bhattarai, Rahul Pandey, Jaya Madan,et al. Royal Society of Chemistry (RSC)
Strontium antimony iodide (Sr3SbI3) is one of the emerging absorbers materials owing to its intriguing structural, electronic, and optical properties for efficient and cost-effective solar cell applications.
Rahul Pandey, Sagar Bhattarai, Kulbhushan Sharma, Jaya Madan, Ali K. Al-Mousoi, Mustafa K. A. Mohammed, and M. Khalid Hossain American Chemical Society (ACS)
Sagar Bhattarai, M. Khalid Hossain, G. F. Ishraque Toki, D. P. Samajdar, Rahul Pandey, Jaya Madan, and Mongi Amami American Chemical Society (ACS)
Sagar Bhattarai, Deepthi Jayan K, Rahul Pandey, Jaya Madan, Mohd Zahid Ansari, Mongi Amami, and M. Khalid Hossain American Chemical Society (ACS)
M. Khalid Hossain, G.F. Ishraque Toki, A. Kuddus, Mustafa K.A. Mohammed, Rahul Pandey, Jaya Madan, Sagar Bhattarai, Md. Ferdous Rahman, D.K. Dwivedi, Mongi Amami,et al. Elsevier BV
Smriti Baruah, Janmoni Borah, Sagar Bhattarai, and Santanu Maity Elsevier BV
Sagar Bhattarai, Dipankar Gogoi, Arvind Sharma, and T. D. Das Springer Science and Business Media LLC
D. V. Prashant, Suneet Kumar Agnihotri, Sagar Bhattarai, Rahul Pandey, Jaya Madan, M. Khalid Hossain, and Dip Prakash Samajdar American Chemical Society (ACS)
Sagar Bhattarai, M. Khalid Hossain, Lamia Ben Farhat, Riadh Marzouki, Ismail Hossain, Mohd Zahid Ansari, Jaya Madan, and Rahul Pandey Royal Society of Chemistry (RSC)
The trapping of photons and broad-spectrum absorption of solar irradiance are the primary focus of numerous solar cell research applications.
Sagar Bhattarai, Rahul Pandey, Jaya Madan, Soney Tayeng, P. K. Kalita, Mohd Zahid Ansari, Lamia Ben Farhat, Mongi Amami, and M. Khalid Hossain Royal Society of Chemistry (RSC)
This research investigates the influence of halide-based methylammonium-based perovskites as the active absorber layer (PAL) in perovskite solar cells (PSCs).