Halide

Chemistry

Materials science

Optoelectronics

Engineering

Physics

Nanotechnology

Perovskite (structure)

Photovoltaic system

Band gap

Semiconductor

Electrical engineering

Inorganic chemistry

Condensed matter physics

Chemical engineering

Engineering physics

Crystallographic defect

Layer (electronics)

Passivation

Angewandte Chemie International Edition

In several photovoltaic (PV) technologies, the presence of electronic defects within the semiconductor band gap limit the efficiency, reproducibility, as well as lifetime. Metal halide perovskites (MHPs) have drawn great attention because of their excellent photovoltaic properties that can be achieved even without a very strict film-growth control processing. Much has been done theoretically in describing the different point defects in MHPs. Herein, we discuss the experimental challenges in thoroughly characterizing the defects in MHPs such as, experimental assignment of the type of defects, defects densities, and the energy positions within the band gap induced by these defects. The second topic of this Review is passivation strategies. Based on a literature survey, the different types of defects that are important to consider and need to be minimized are examined. A complete fundamental understanding of defect nature in MHPs is needed to further improve their optoelectronic functionalities.

Reducing Detrimental Defects for High‐Performance Metal Halide Perovskite Solar Cells