Self‐Healing Perovskite Solar Cells: Introduction, Recent Progresses and Perspective

ABSTRACT The power conversion efficiency (PCE) of perovskite solar cells (PSCs) is sufficiently high for commercialization, however, the long‐term stabilities of PSCs and potential Pb leakage need to be addressed seriously. Self‐healing PSCs are very promising for developing long‐life and flexible devices. Herein, we provide a review on self‐healing PSCs and aim to contribute a valuable summary and support to the ongoing efforts devoted to this area. In the first part, the major factors affecting the stabilities of PSCs and the corresponding stability‐losing mechanisms are briefly introduced, which is the groundwork for developing self‐healing PSCs. The second part is a brief introduction on self‐healing materials, including the key requirements, self‐healing mechanisms, and the typical applications in soft electronics. With the information in the first two parts, we conduct a comprehensive review on the research of self‐healing PSCs in the third part. Last but not least, the main challenges and long‐term perspective for realizing the large scale utilizations of self‐healing PSCs are discussed. In addition to the fields of PSCs, self‐healing strategies are applicable to other flexible (opto)electronics as well. Therefore, a broad readership from varied areas of soft devices can also find interested points from this review.