Interfaces in Perovskite Solar Cells

TLDR

Fundamental questions about interfacial atomic and electronic structures, stability, and the importance of interface design in perovskite solar cells remain to be clarified for future development. This review examines interfacial atomic and electronic structures, charge transfer processes, and interface engineering in perovskite solar cells. An effective heterojunction at the window/perovskite interface facilitates rapid electron extraction, while slow interfacial recombination from superior material and electronic properties yields high photovoltage.

Abstract

The interfacial atomic and electronic structures, charge transfer processes, and interface engineering in perovskite solar cells are discussed in this review. An effective heterojunction is found to exist at the window/perovskite absorber interface, contributing to the relatively fast extraction of free electrons. Moreover, the high photovoltage in this cell can be attributed to slow interfacial charge recombination due to the outstanding material and interfacial electronic properties. However, some fundamental questions including the interfacial atomic and electronic structures and the interface stability need to be further clarified. Designing and engineering the interfaces are also important for the next-stage development of this cell.