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Open AccessArticle

Ultrasonic Spray-Coating of Large-Scale TiO2 Compact Layer for Efficient Flexible Perovskite Solar Cells

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State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, China
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School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Seung Hwan Ko, Daeho Lee and Zhigang Wu
Micromachines 2017, 8(2), 55; https://doi.org/10.3390/mi8020055
Received: 31 December 2016 / Revised: 23 January 2017 / Accepted: 26 January 2017 / Published: 14 February 2017
(This article belongs to the Special Issue Flexible and Stretchable Electronics)
Flexible electronics have attracted great interest in applications for the wearable devices. Flexible solar cells can be integrated into the flexible electronics as the power source for the wearable devices. In this work, an ultrasonic spray-coating method was employed to deposit TiO2 nanoparticles on polymer substrates for the fabrication of flexible perovskite solar cells (PSCs). Pre-synthesized TiO2 nanoparticles were first dispersed in ethanol to prepare the precursor solutions with different concentrations (0.5 mg/mL, 1.0 mg/mL, 2.0 mg/mL) and then sprayed onto the conductive substrates to produce compact TiO2 films with different thicknesses (from 30 nm to 150 nm). The effect of the different drying processes on the quality of the compact TiO2 film was studied. In order to further improve the film quality, titanium diisopropoxide bis(acetylacetonate) (TAA) was added into the TiO2-ethanol solution at a mole ratio of 1.0 mol % with respect to the TiO2 content. The final prepared PSC devices showed a power conversion efficiency (PCE) of 14.32% based on the indium doped tin oxide coated glass (ITO-glass) substrate and 10.87% on the indium doped tin oxide coated polyethylene naphthalate (ITO-PEN) flexible substrate. View Full-Text
Keywords: ultrasonic spray; titanium oxide; flexible perovskite solar cells; low temperature; large area ultrasonic spray; titanium oxide; flexible perovskite solar cells; low temperature; large area
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MDPI and ACS Style

Zhou, P.; Li, W.; Li, T.; Bu, T.; Liu, X.; Li, J.; He, J.; Chen, R.; Li, K.; Zhao, J.; Huang, F. Ultrasonic Spray-Coating of Large-Scale TiO2 Compact Layer for Efficient Flexible Perovskite Solar Cells. Micromachines 2017, 8, 55.

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