Simulation Study of CZTS/CZTSe Tandem Solar Cell by Using SCAPS-1D Software

Authors Leila Ghalmi1, Souhila Bensmaine1, Mourad Elbar2, Slimane Chala2,3, Hayat Merzouk1

1Materials and Renewable Energy Research Unit, Faculty of Sciences, Abou Bekr Belkaid University, 13000 Tlemcen, Algeria

2Laboratory of Metallic and Semiconducting Materials, Mohamed Khider University, 07000 Biskra, Algeria

3Institute of Electrical and Electronic Engineering, M’Hamed Bougara University, 35000 Boumerdes, Algeria

Issue Volume 14, Year 2022, Number 6
Dates Received 06 October 2022; revised manuscript received 26 December 2022; published online 27 December 2022
Citation Leila Ghalmi, Souhila Bensmaine, et al., J. Nano- Electron. Phys. 14 No 6, 06033 (2022)
PACS Number(s) 78.20.Bh, 73.40.Lq, 84.60.Jt
Keywords Simulation (35) , SCAPS-1D (21) , CZTS/CZTSe tandem solar cell, Current matching, Filtered spectrum.

The solar spectrum can be divided by tandem solar cells into several subcells that have different bandgaps which convert, more effectively, the light into electricity than the single cells. In this study, the simulation of the photovoltaic (PV) characteristics of a CZTS/CZTSe tandem solar cell, based on structures of copper zinc tin sulfide (CZTS) as a top cell and copper zinc tin selenide (CZTSe) as a bottom cell, was accomplished by using SCAPS-1D simulator under AM1.5 illumination. Initially, the simulation of single CZTS and CZTSe solar cells was performed to give efficiency of 14.37 % and 17.87 %, respectively, which are in good agreement with the literature results. Before feeding with filtered spectrum, the simulated PV parameters of the CZTS/CZTSe tandem solar cell are the conversion efficiency () of 20.68 % and the short-circuit current density (Jsc) of 20.205 mA/cm2 of the top and bottom cells with arbitrary normal thicknesses. Furthermore, and in order to reach the matching current, both top and bottom cells have been investigated at different thicknesses for tandem configuration after validation, where the performance of the top and bottom cells is at thicknesses ranged from 0.05-0.5 m and 0.1-1 m, respectively. The performance of the tandem solar cell is determined after filtered spectrum feeding and current matching. The Jsc of CZTS/CZTSe tandem solar cell is 20.33 mA/cm2 for 0.255 m thick of the top, CZTS, cell and 0.8 m of the bottom, CZTSe, cell. The maximum of 22.98 % is reached for tandem structure design with open circuit voltage (Voc) enhancing of 1.48 V.

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