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Grain engineering by ultrasonic substrate vibration post treatment of wet perovskite films for annealing-free, high performance, and stable perovskite solar cells

Abstract

Perovskite solar cells (PSCs) have gained great interest, owing to a fast increase in their power conversion efficiency (PCE), within few years. However, their wide spreading and scale-up is hampered, due to multiple obstacles, such as chemical instability, which leads to a short lifetime, and their complicated reaction and crystallization, which requires annealing. Here, we address these issues using ultrasonic substrate vibration post treatment (SVPT) applied on as-spun perovskite wet films, so as to achieve a uniform, microscale and stable mixed-halide and mixed-cation perovskite layer, (FAPbI3)0.85(MAPbBr3)0.15, without the need for a conventional thermal annealing step. This is achieved by the creation of fluid micromixing and in-situ annealing within the solution, caused by the ultrasonic excitation of the wet film. Optoelectronic properties of the perovskite films subjected to the SVPT, including photoemission, carrier lifetime and band gap are remarkabley improved compared to the conventionally annealed films. When incorported into a planar PSC, a maximum PCE of 18.55 % was achieved, compared to 15.17 % for the control device, with high reproducibility and no hysterysis, and the device retained 80 % of its initial PCE, over a period of 20 days of storage in ambient condition.

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Publication details

The article was received on 19 Jan 2018, accepted on 28 Mar 2018 and first published on 29 Mar 2018


Article type: Paper
DOI: 10.1039/C8NR00540K
Citation: Nanoscale, 2018, Accepted Manuscript
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    Grain engineering by ultrasonic substrate vibration post treatment of wet perovskite films for annealing-free, high performance, and stable perovskite solar cells

    H. Xiong, F. Zabihi, H. Wang, Q. Zhang and M. Eslamian, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00540K

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