Affiliation:
1. Key Laboratory for Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710062 China
2. Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
3. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China
Abstract
AbstractThe bulk and surface of a perovskite light‐harvesting layer are two pivotal aspects affecting its carrier transport and long‐term stability. In this work, lead(II) 2‐ethylhexanoate (LDE) is introduced via an antisolvent process into perovskite films to change the reaction kinetics of the crystallization process, resulting in a high‐quality perovskite film. Meanwhile, a carboxyl functional group with a long alkyl chain coordinates with the Pb cation, reducing the defect density related to unsaturated Pb atoms. Moreover, the long alkyl chains form a protecting layer at the surface of the perovskite film to prevent chemical attack by water and air, prolonging the lifetime of perovskite devices. Consequently, the assembled device demonstrates a power conversion efficiency (PCE) of 24.84%. Both of the thermal and operational stability are significantly improved due to reduced ion‐migration channels.
Funder
Fundamental Research Funds for the Central Universities
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
10 articles.
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