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Textured CH3NH3PbI3 thin Film with Enhanced Stability for High Performance Perovskite Solar Cells

Authors Long, Mingzhu
Zhang, Tiankai
Zhu, Houyu
Li, Guixia
Wang, Feng
Guo, Wenyue
Chai, Yang
Chen, Wei
Li, Qiang HKUST affiliated (currently or previously)
Wong, Kam Sing View this author's profile
Xu, Jianbin
Yan, Keyou
Issue Date 2017
Source Nano Energy , v. 33, March 2017, p. 485-496
Summary MAPbI3 perovskite is an important component for high-performance perovskite solar cell (PSC) but its own thin film stability is challenging in PSC community. Herein, we report a high crystallinity perovskite MAPbI3 with texture structure prepared from HPbI3 reacted with low partial pressure (LPP) MA gas, that has substantially higher both thermal and moisture stability than polycrystalline perovskite (PP) prepared from MAI+PbI2. A prototype reactor is developed to perform coordination engineering between MA vapor and HPbI3 solid and facilitate the large-scale fabrication. The large Pb-N binding energy (~80.04 kJ mol−1) results in the liquefied state after MA adhesion. Finally, a high texture perovskite (TP) is formed after excess MA expeditious releasing. The MA-rich passivation through Pb-N bonding at interface and boundary contributes to the substantial improved stability. Besides, MA-rich species trigger an anti-degradation reaction in presence of moisture and thus endow stability above two months under ~65% humidity. The textured PSCs (TPSCs) deliver power conversion efficiency (PCE) between 15.5% and champion 18.9% in the batch deposition. Therefore, the coordination engineering improves the efficiency, stability, scalability and ease of fabrication together. © 2017 Elsevier Ltd
ISSN 2211-2855
Language English
Format Article
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