Advances and Challenges in Molecular Engineering of 2D/3D Perovskite Heterostructures

Abstract

Organic-inorganic hybrid perovskite have been intensively studied in the past decades due to their outstanding performance in solar cells and other optoelectronic devices. Recently, the emergence of two-dimensional/three-dimensional (2D/3D) heterojunctions have enabled many solar cell devices with >25% power conversion efficiency, which was driven by the advances in our understanding of the structural and photophysical properties of the heterojunctions and our ability in controlling these properties through organic cation configuration in 2D perovskites. In this feature article, we discuss the fundamental understanding of structure characteristics and the carrier dynamics in 2D/3D heterojunctions and their impacting factors. We further elaborate the design strategies of molecular configuration of the organic cations to achieve thorough management of these properties. Finally, the recent advances of 2D/3D heterostructures in solar cells, light emitting devices and photodetectors are highlighted, which translate the fundamental understandings to the device applications, and also reveal the remaining challenges in ligand design for next generation of stable devices. Future development prospects and related challenges are also provided with wide perspective and insightful thoughts.