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ARTICLE

Numerical simulation of the effect of gradual substitution of sulfur with selenium or tin with germanium in Cu₂ZnSnS₄ absorber layer on kesterite solar cell efficiency

N. Messei^a,*, M. S. Aida^b, A. Attaf^a, N. Hamani^a, S. Laznek^c

a Laboratory of Thin Films and Applications, Mohamed Khider University. Algeria
b Department of Physics, Faculty of Science, King Abdulaziz University, Saudi Arabia
4 Department of SM, Faculty of Exact, Natural and Life Science, Mohamed Khider University. Algeria

* Corresponding Author:

Chalcogenide Letters 2023, 20(2), 165-175. https://doi.org/10.15251/CL.2023.202.165

Received 24 November 2022; Accepted 17 February 2023;

Abstract

To enhance the efficiency of kesterite Cu₂ZnSnS₄ solar cell, different gradient strategies are investigated. Absorber layer gradient is obtained by partial substitution of sulfur with selenium or tin with germanium. The PV Parameters are calculated using the SCAPS1D program. The effect of the front, back, and double gradient on the cell parameters was investigated. We proposed also the fully graded gap absorber layer profile. The opencircuit voltage has increased to 1.040V, the fill factor has increased to 71.69%, and the efficiency has exceeded 22.95%. In contrast to other types of gradients, the short-circuit current density remains high (J_sc= 39.7mA / cm²).

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