Affiliation:
1. Key Lab of Artificial Micro‐ and Nano‐Structures of Ministry of Education of China School of Physics and Technology Wuhan University Wuhan Hubei 430072 China
Abstract
AbstractSequential deposition has been widely employed to modulate the crystallization of perovskite solar cells because it can avoid the formation of nucleation centers and even initial crystallization in the precursor solution. However, challenges remain in overcoming the incomplete and random transformation of PbI2films with organic ammonium salts. Herein, a unique intermediate phase engineering strategy has been developed by simultaneously introducing 2,2‐azodi(2‐methylbutyronitrile) (AMBN) to both PbI2and ammonium salt solutions to regulate perovskite crystallization. AMBN not only coordinates with PbI2to form a favorably mesoporous PbI2film due to the coordination between Pb2+and the cyano group (C≡N), but also suppresses the vigorous activity of FA+ions by interacting with FAI, leading to the full PbI2transformation with the preferred orientation. Therefore, perovskites with favorable facet orientations are obtained, and the defects are largely suppressed owing to the passivation of uncoordinated Pb2+and FA+. As a result, a champion power conversion efficiency over 25% with a stabilized efficiency of 24.8% is achieved. Moreover, the device exhibits an improved operational stability, retaining 96% of initial power conversion efficiency under 1000 h continuous white‐light illumination with an intensity of 100 mW cm−2at ≈55 °C in N2atmosphere.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Hubei Province
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
42 articles.
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