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A Pure And Stable Intermediate Phase Is Key To Growing Aligned And Vertically Monolithic Perovskite Crystals For Efficient PIN Planar Perovskite Solar Cells With High Processibility And Stability

Authors Bai, Yang HKUST affiliated (currently or previously)
Xiao, Shuang HKUST affiliated (currently or previously)
Hu, Chen HKUST affiliated (currently or previously)
Zhang, Teng HKUST affiliated (currently or previously)
Meng, Xiangyue HKUST affiliated (currently or previously).
Li, Qiang HKUST affiliated (currently or previously)
Yang, Yinglong HKUST affiliated (currently or previously)
Wong, Kam Sing View this author's profile
Chen, Haining
Yang, Shihe View this author's profile
Issue Date 2017
Source Nano Energy , v. 34, April 2017, p. 58-68
Summary Solvent engineering has been extensively used to control the growth of a high-quality perovskite layer for solar cells by forming intermediate phases. However, the intermediate phase formation is often poorly understood and its effects on the perovskite layer growth are still elusive. Here, we have conducted a systematic and in-depth study on the above two issues through a strict control over the DMSO/DMF ratio in CH3NH3PbI3 perovskite solutions, and thus an effective control over the compositions of intermediate films. The films thus obtained, including perovskite, perovskite/MA2Pb3I8(DMSO)2 and MA2Pb3I8(DMSO)2, afford perovskite crystals via down-growth, down-and up-growth, and up-growth mechanisms, respectively. Significantly, the up-growth perovskite crystals from the pure MA2Pb3I8(DMSO)2 exhibits the best interface contact with NiO substrate, optimal alignment without horizontal grain boundaries and a relatively large grain size, which facilitate charge transfer and reduce charge recombination in PSCs. As a result, the PIN planar PSCs based on NiO have achieved a PCE of 18.4%, a value which is among the highest for NiO-based PSCs, with the highest stability among the tested sample cells. Furthermore, the pure MA2Pb3I8(DMSO)2 intermediate phase presents a high long-term stability, which enlarges the operating window for perovskite deposition and thus considerably improves the device processibility. © 2017 Elsevier Ltd
ISSN 2211-2855
Language English
Format Article
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