Analysis of optical and electrical properties in CZTSSe thin film solar cells through the 2d theoretical modeling

Abstract

In this work, a 2D simulator (i.e., SILVACO ATLAS simulator) was used for modeling the Cu2ZnSn(S, Se)4 (CZTSSe) thin film solar cells. This simulation study mainly focused on the influence of the electrical and optical parameters that describe the electrical properties of each layer and the absorbed radiation in the heterostructure. These two parameters are analyzed and optimized to get as high of an efficiency as possible. It was characterized by means of the simulation that the effect of the electrical and optical parameters on the solar cell output parameters (VOC,JSC,FF,andη) was studied. The other parameters, such as temperature, bandgap, mobility, and thickness, were also varied in this simulative study for optimizing the device performance. The second record efficiency of 12.6 % was observed for the CZTSSe thin film solar cell (TFSC). This obtained result was compared with the results attained from the SCAPS-1D simulation as well as the second record efficiency for CZTSSe TFSC. Moreover, the Haze function was used to characterize the transmittance and diffuse reflectance in the rough interfaces between the layers of the solar cell. The Haze function utilized the input data like roughness and correction prefactors, which mainly impact the root-mean-square interface roughness (σrms) value by studying the External Quantum Efficiency curve variation. After analyzing these parameters, the efficiency was slightly improved to 13.02 %. Therefore, theoretical modeling could be beneficial to design highly efficient devices without utilizing experimental resources.