Parametric Analysis and Optimization of Lead Free Methylammonium Tin Halides based Solar Cells

In this paper, the detailed investigation and optimization of four different Sn-based halides with different iodide and bromide composition are presented. SCAPS device simulator is used to perform the device simulation for different structures. Parametric analysis and optimization have been carried out in terms of absorber layer thickness variation and bulk defect density. The results are interpreted with the help of an energy band diagram and illuminated J-V curves. It has been observed that the best performance is obtained with a ۵۰۰ nm thick absorber layer having the lowest defect density of ۱×۱۰۱۵ cm-۳ for all the devices under consideration. The champion device showed ۲۰% conversion efficiency with MASnI۳ at ۵۰۰ nm thickness with a bulk defect of ۱×۱۰۱۵ cm-۲. Detailed analysis related to transparency of substrate and cathode workfunction is also reported to understand the influence of these parameters on the performance of lead-free Snbased perovskite solar cells.

Keywords:

Methylammonium tin halides , MASnI۳ , Solar cells , Lead-free