Issue 11, 2022

Stable perovskite solar cells with 25.17% efficiency enabled by improving crystallization and passivating defects synergistically

Abstract

The film quality of a light absorber is the key factor that limits the efficiency and stability of perovskite solar cells (PSCs). Herein, a new ammonium salt of 2-amidinopyrimidine hydrochloride (APC) is introduced into the surface and shallow layer of a perovskite film for further improving the performance of PSCs. The multi-functional groups within APC not only passivate the iodine vacancies (undercoordinated Pb2+ defects) through interaction with pyrimidine N, but also compensate the formamidine (FA) vacancies (undercoordinated I) via N–H⋯I hydrogen or ionic bonding. APC also finely tunes the crystallization of FA-based perovskite films, resulting in an ultralong photoluminescence lifetime of about 5 μs and a larger carrier diffusion length of more than 4 μm, which is on par with single crystal perovskites. Benefiting from the excellent charge-carrier activities, the champion device delivers an impressive power conversion efficiency (PCE) of 25.17% (certified 24.51%), a notable fill factor of over 84%, and an open-circuit voltage of 1.184 V (the voltage deficit is only 0.37 V). Additionally, the APC treated device demonstrates excellent long-term storage and operational stability. This study will pave a new avenue for improving the perovskite film quality and realizing highly efficient and stable PSCs.

Graphical abstract: Stable perovskite solar cells with 25.17% efficiency enabled by improving crystallization and passivating defects synergistically

Supplementary files

Article information

Article type
Paper
Submitted
16 Jul 2022
Accepted
14 Sep 2022
First published
16 Sep 2022

Energy Environ. Sci., 2022,15, 4700-4709

Stable perovskite solar cells with 25.17% efficiency enabled by improving crystallization and passivating defects synergistically

Y. Wu, Q. Wang, Y. Chen, W. Qiu and Q. Peng, Energy Environ. Sci., 2022, 15, 4700 DOI: 10.1039/D2EE02277J

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