Indian researchers simulated a new coupling of a CSGEI3 Lead-free Halide Perovskiet Top cell with a copper-Indium-gallium-selenide soil cell. The resulting tandem device can achieve a power conversion -efficiency of 26.06%
Researchers, led by a Visvesvaraya National Institute of Technology team in India, have simulated a tandem solar cell based on a lead-free perovskiet top cell with a wide energy band of 1.6 EV and a copper-Indium-Gallium-Gallium-selenide (CIGS) with a narrow band of 1,1 EVE device.
The new two-term device has a potential conversion efficiency of 26.06%
“The current study focuses on minimizing the losses associated with one junction such as thermalization and transmission losses by using a new device structure consisting of perovskiet (CSGEI3) and CIGS,” Sushama M. Giripunje, corresponding author of the study said PV -MagazineAdding that it was a first attempt to link a top cell based on CSGEI3 with a soil CIGS cell in a tandem structure.
The scientists described how they used Scaps 1D to simulate a new Tandem CSGEI3 Perovskite-Cigs cell in “Numerical simulation analysis of two-terminal monolithic perovskiet-cigs tandem solar cell for improved photovoltaic performance using scaps-1d‘Published by Langmuir.
The group designed the tandem solar cell structure using a filtered spectrum approach.
To guarantee the accuracy of the simulated results, the team first calmed both the top and bottom solar cells with the help of experimental data and then compared the simulated results with experimental findings.
They investigated the impact of thickness, parasitic resistance, temperature, quantum efficiency, band diagram, absorption coefficients and the equivalent circuit parameters of two diodes on the performance of solar cells.
They designed a CSGEI3/Cigs tandem solar cell with a 273 Nm top cell, simulated under am1.5 g and a bottom cell of 1000 Nm.
The SCAPS software predicted the efficiency of power conversion respectively 16.93% and 16.49%. The tandem device conversion efficiency was 26.06% with an open circuit voltage of 1.73 V, short-circuit current density of 19.32 MA CM-2 and a filling factor of 77.98%.
“This perovskiet-cigs tandem design shows a promising route for developing highly efficient, cheap tandem solar cells,” said Giripunje.
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