Advanced Applications of Atomic Layer Deposition in Perovskite‐Based Solar Cells

Perovskite solar cells (PSCs) have shown remarkable photovoltaics progress with a record‐eminent power conversion efficiency (PCE) of 25.2%. Therefore, the PSCs are potential candidates to replace traditional crystalline silicon‐based solar cells. However, the PCE and stability of PSCs need to be improved for successful commercialization. Recently, the atomic layer deposition (ALD) technology is successfully applied to fabricate the encapsulation layer, which overcomes the long‐standing issues of perovskite‐based solar cells based on others’ pioneering work on ALD in PSCs several years ago. The organic–inorganic alternating encapsulation structure that the team researched has exhibited a water vapor transmittance rate of 1.3 × 10 −5 g m −2 day −1 , which is the lowest value among the reported thin‐film encapsulation layers of PSCs. Herein, the properties of ALD and how it is used in PSCs, such as device architecture, surface modification, passivation, and encapsulation, which result in higher PCEs and excellent stability, are discussed. In addition, the potential significance of applying ALD in the manufacture of tandem and flexible PSCs and the synthesis of high‐quality perovskite materials is also analyzed.