Mechanism of Enhancement in Perovskite Solar Cells by Organosulfur Amine Constructed 2D/3D Heterojunctions

Constructing a 2D/3D heterojunction perovskite that could remain highly efficient and improve the stability of perovskite solar cells (PSCs) is explored. In this paper, we compared 2D/3D heterojunction perovskite films passivated by organosulfur and commonly used organic amine salts. Results indicated that the perovskite film passivated by organosulfur amine salts had a lower trap state density, longer carrier lifetime, improved energy level alignment, and higher thermal and moisture stability. An approximate 21% power conversion efficiency (PCE) was obtained in the champion device. After the comparison, the passivation mechanism of the organosulfur 2D/3D heterojunction was proposed.