Stable Sn/Pb-Based Perovskite Solar Cells with a Coherent 2D/3D Interface.

ABSTRACT: Low-band-gap metal halide perovskite semiconductor based on mixed Sn/Pb is a key component to realize high-efficiency tandem perovskite solar cells. However, the mixed perovskites are unstable in air due to the oxidation of Sn²⁺. To overcome the stability problem, we introduced N-(3-aminopropyl)-2-pyrrolidinone into the CH₃NH₃Sn_0.5Pb_0.5I_xCl_3-x thin film. The carbonyl group on the molecule interacts with Sn²⁺/Pb²⁺ by Lewis acid coordination, forming vertically oriented 2D layered perovskite. The 2D phase is seamlessly connected to the bulk perovskite crystal, with a lattice coherently extending across the two phases. Based on this 2D/3D hybrid structure, we assembled low-band-gap Sn-based perovskite solar cells with power conversion efficiency greater than 12%. The best device was among the most stable Sn-based organic-inorganic hybrid perovskite solar cells to date, keeping 90% of its initial performance at ambient condition without encapsulation, and more than 70% under continuous illumination in an N₂-filled glovebox for over 1 month.

SUBMITTER: Chen Z 

PROVIDER: S-EPMC6240600 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature