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Appl. Sci. 2018, 8(2), 308; https://doi.org/10.3390/app8020308

Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai 200240, China
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Received: 8 February 2018 / Revised: 17 February 2018 / Accepted: 19 February 2018 / Published: 21 February 2018
(This article belongs to the Section Acoustics)
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Abstract

In this work, a novel, facile, and low-cost mechanical post treatment technique, i.e., ultrasonic substrate vibration post treatment (SVPT) is applied on wet spun perovskite layers. The effect of varying the time of the SVPT on the characteristics of the perovskite crystals and the perovskite film is studied, in order to achieve the optimum time duration of the SVPT. Among the results, it is found that the application of only three minutes of the SVPT (for the ultrasonic vibration assembly used in this study, operated at 40 kHz) brings about significant improvement in the film coverage, and the contact between the perovskite and the m-TiO2 layers, owing to the effective penetration of the perovskite solution into the pores, leading to a superior charge transfer, and a significant increase in the device power conversion efficiency (PCE), when compared to the control device. This unprecedented effect is repeatable when applied on both single and mixed halide perovskites, putting forward a reliable and low-cost mechanical technique for the fabrication of perovskite solar cells (PSCs) in the lab and beyond, which could reduce or eliminate the tedious and expensive chemical optimization treatments, commonly used to increase the PCE. View Full-Text
Keywords: perovskite solar cells; ultrasonic substrate vibration post treatment; mechanical treatment; mesoporous TiO2; process scale-up perovskite solar cells; ultrasonic substrate vibration post treatment; mechanical treatment; mesoporous TiO2; process scale-up
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ahmadian-Yazdi, M.-R.; Habibi, M.; Eslamian, M. Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance. Appl. Sci. 2018, 8, 308.

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