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Crystallization Manipulation and Morphology Evolution for Highly Efficient Perovskite Solar Cell Fabrication via Hydration Water Induced Intermediate Phase Formation under Heat Assisted Spin-Coating

Abstract

A delicate control of crystallization and morphology of perovskite absorber is critical to obtain high performance hybrid perovskite solar cells (PSCs). Here, we have developed a novel crystallization strategy which involves hydration water induced intermediate phase formation under heat assisted spin-coating processing (HASP) to manipulate the morphology and grain size of perovskite films, and thus can avoid the use of toxic and volatile antisolvents used in coventional one-step solution process to make PSCs. During HASP, impressive film morphological evolution occurs with the formation of CH3NH3PbI3•xH2O perovskite intermediate phases. With ingenious control of the crystallization kinetics, highly crystalline perovskite films with less defect states and high carrier lifetimes are obtained. The corresponding PSCs exhibit a power conversion efficiency (PCE) of 19.12% with stabilized power output efficiency of 18.89% at the maximum power point, which is 70% enhancement compared to that of the conventional one-step process based PSCs. Furthermore, the PSC fabricated by the HASP method achived a PCE of 15.47% with an active area of 1.2 cm2. Moreover, the flexible PSCs fabricated by the HASP method achieved a record efficiency of 14.87% with negligible hysteresis for PEDOT:PSS-based flexible inverted PSCs. Our work opens up a new avenue for morphology and crystallization control through hydration water induced intermediate phase formation under HASP, which paves the way toward further enhancing the device performance of perovskite solar cells.

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Publication details

The article was received on 11 Oct 2017, accepted on 08 Jan 2018 and first published on 10 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08947C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Crystallization Manipulation and Morphology Evolution for Highly Efficient Perovskite Solar Cell Fabrication via Hydration Water Induced Intermediate Phase Formation under Heat Assisted Spin-Coating

    X. Zhou, Y. zhang, W. G. Kong, M. Hu, L. Zhang, C. Liu, L. Xiangnan, C. Pan, G. Yu, C. Cheng and B. Xu, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08947C

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