A critical review of materials innovation and interface stabilization for efficient and stable perovskite photovoltaics

Abstract

Perovskite solar cells (PSCs) based on organometal halide (Omh) perovskites have been exhibited superb potential for next-generation photovoltaic applications because of their ever-increasing power conversion efficiencies over the past decade. However, their operational stability remains a challenge, which are attributed to the ionic nature of Omh perovskites and defects of heterojunction interfaces in a stacked solar cell. Thus, stabilization of Omh perovskites phases and device interfaces are of paramount importance towards long-term stable PSCs. This review presents an important tool to explore efficient and stable PSCs by Omh perovskite-based composites and interface stabilization strategies. Moreover, it deals with the study on materials selection for effective design of Omh perovskite composites and cell heterojunction interfaces. The chemical and electrical characteristics of Omh perovskite composites and device interface states, including perovskite film growth, defect tolerance, interface trap passivation, strong chemical interaction, cross-linking and/or chemical bonding, are further discussed. These features provide insights into the stabilization and immobilization of Omh perovskite structures and stacked solar cell interfaces for highly efficient and stable perovskite photovoltaics. Recent progress in materials innovation and interface stabilization for highly efficient and operationally-stable perovskite photovoltaics. • Degradation factors and their mechanisms in perovskite photovoltaics are briefly analyzed. • Judicious strategies to stabilize perovskites phases and solar cell heterojunction interfaces are reviewed. • Key works related to efficient perovskite photovoltaics by materials innovation and interface stabilization are presented.