Electrical engineering

Nanotechnology

Energy conversion efficiency

Engineering physics

Heterojunction

Interface (matter)

Engineering

Perovskite (structure)

Composite material

Capillary action

Materials science

Capillary number

Photovoltaic system

Polymer solar cell

Chemical engineering

Optoelectronics

Hybrid solar cell

Advanced Energy Materials

Organic–inorganic hybrid perovskite solar cells (PSCs) are promising third‐generation solar cells. They exhibit high power conversion efficiency (PCE) and, in theory, can be manufactured with less energy than several more established photovoltaic technologies, particularly solution‐processed PSCs. Various materials have been widely utilized to modify the buried bottom interface to improve the performance and long‐term stability of PSCs. Here, the latest progress in modifying the buried interface to enhance the performance and stability of PSCs is examined from a materials standpoint, which is classified into inorganic salts, the organic molecular and polymer, carbon materials, perovskite‐related materials, and 2D materials. This material perspective is useful in determining the tactics for achieving the theoretical PCE value of PSCs. It also serves as a solid reference of interface adjustment for other layered structure heterojunction devices.

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective