Design and optimization of 26.3% efficient perovskite/FeSi 2 monolithic tandem solar cell
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Design and optimization of 26.3% efficient perovskite/FeSi2 monolithic tandem solar cell Anisha Pathania1 · Rahul Pandey1 · Jaya Madan1 · Rajnish Sharma1 Received: 23 April 2020 / Accepted: 23 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A multijunction or tandem technique comprising a wide bandgap top cell and a narrow bandgap bottom cell may be a major stepping stone in an attempt to obtain high-efficiency solar cells. However, easier said than done, it takes a lot to correctly optimize the structure of all the involved layers so as to possibly obtain the desired results. In this paper, a perovskite (CH3NH3PbI3)/FeSi2 (p-i-n structure) 2-terminal (2-T) monolithic tandem solar cell is proposed and investigated using AFORS-HET v2.5 1D simulator. A hydrogenated amorphous silicon (a-Si:H)/hydrogenated microcrystalline silicon oxide (µc-Si1−xOx:H) tunnel recombination junction is employed to interconnect both perovskite and FeSi2 solar cell for current matching. The influence of both top and bottom absorber layer thickness is analyzed to optimize the device performance. The study reveals an optimized 26.3% efficient perovskite/FeSi2 monolithic tandem solar cell with JSC (21.4 mA cm−2), VOC (1.63 V), and FF (74.86%). The results in this paper suggest F eSi2 material with 0.87 eV bandgap as an alternative for narrow bandgap bottom cell for the perovskite-based tandem solar cells so as to obtain much higher efficiencies.
1 Introduction Harvesting maximum of solar energy by means of semiconductor materials exhibiting photovoltaic (PV) characteristics has so far remained a prominent approach for researchers to find out alternate renewable energy sources. However, the most dominating material silicon is reaching towards its theoretical single-junction auger efficiency limit (i.e., 29%) [1–3] and so are the others (CIGS, GaAs, perovskite, etc.) [4, 5]. Adjoining two individual solar cells, however, can make the efficiency go beyond the single-junction solar cell limit of 33% [S-Q] [6–9]. De Vos [10] explained that the efficiency achieved by two or more adjoined solar cells can be greater than 40%. The two-cell configuration of wide bandgap top solar cell (WBT cell) over narrow bandgap bottom solar cell (NBB cell) can further reduce the thermalization * Rahul Pandey [email protected] * Jaya Madan [email protected] * Rajnish Sharma [email protected] 1
VLSI Centre of Excellence, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, Punjab, India
loss and transparent Eg loss. The theoretical achievable efficiency under two junction tandem configurations as a function of top and bottom subcell energy bandgap is predicted by Bremner et al. [11, 12] and the same has been shown in Fig. 1. The maximum efficiency of 47% could be achieved by using two junction tandem configuration with top subcell and bottom subcell having a bandgap of 1.63 eV and 0.96 eV, respectively. Recently emerged perovskite
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