Designed Functional Molecule for High Stable and Efficient Perovskite Solar Cells

Abstract

Perovskite solar cells have showed outstanding advantage as a clean energy because of their rapid development of power conversion efficiency (PCE) and low cost. However, the stability problem still limits their practical applications and commercialization. To overcome the degradation issue, here we designed a novel molecule to achieve the post-modification of the interface of perovskite layer. With the designed passivation molecule, the halide vacancies at interface has been efficiently decreased and the performance of devices gets a distinct promotion. When embodying the passivation layer, the photovoltaic cells exhibit an enhanced PCE of 20.03. In addition, when compared to pristine perovskite solar cell, the stability greatly improved, which retain 60% of the initial PCE for 800 hours at ambient environment.