Modeling and Optimization Study of HIT-CBTSSe Tandem Solar Cell

In the present work, HIT-CBTSSe tandem solar cell device model was developed using Silvaco TCAD simulator. As a first step, HIT and CBTSSe solar cells were modeled and validated. As a next step, the tandem structure is modeled using ITO as tunneling material between CBTSSe top cell and HIT bottom cells. Tandem structure is modeled and simulated, and it initially yields efficiency of 14.53%. The photon absorption profile and the external quantum efficiency are analyzed and the unequal absorption between the top and bottom modules is found to limit the efficiency. The model is optimized, and the maximum attainable efficiency is 22.2%.

Automated summary

In this study, a HIT-CBTSSe tandem solar cell device model was developed using Silvaco TCAD simulator, and was validated and optimized. The results showed that the unequal absorption limit the efficiency, but after optimization, the maximum attainable efficiency can reach 22.2%.