A study of electronic and transport properties of CsSnBr3: A first principle study

Abstract

CsSnBr3 nanocrystals are better than other lead-free perovskites because of their ease and low-cost synthesis, long-term function, and good stability. It is a suitable selection for use in tandem photodetectors. In this study, using the density functional theory, in the first stage, the elastic and electronic properties were calculated. Next, using the calculated quantities, the product of mobility-lifetime (µτ) of the charge carriers of CsSnBr3 was calculated. According to the results obtained, both of the electron and the hole have the lifetime-mobility product of an order 10-3 (V / cm2). The main reason for this can be attributed to the small effective mass of the charge carriers. However, this product has been reported for commercial detectors such as CdTe and CZT for electrons was of an order 10-3-10-2 and for holes in of an order 10-4-10-5. Therefore, due to the same of the product µτ in the CsSnBr3 crystal, the final pulse will be the sum of both charge carriers. As a result, the CsSnBr3 structure can show better potential for use in X-ray and gamma detectors.

Keywords

• perovskite
• elastic constant
• effective mass
• deformation potential
• mobility-lifetime product