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Coatings 2017, 7(3), 42; doi:10.3390/coatings7030042

Defect-Free Large-Area (25 cm2) Light Absorbing Perovskite Thin Films Made by Spray Coating

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai 200240, China
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Academic Editor: Alessandro Lavacchi
Received: 20 January 2017 / Revised: 24 February 2017 / Accepted: 9 March 2017 / Published: 12 March 2017
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Abstract

In this work, we report on reproducible fabrication of defect-free large-area mixed halide perovskite (CH3NH3PbI3−xClx) thin films by scalable spray coating with the area of 25 cm2. This is essential for the commercialization of the perovskite solar cell technology. Using an automated spray coater, the film thickness and roughness were optimized by controlling the solution concentration and substrate temperature. For the first time, the surface tension, contact angle, and viscosity of mixed halide perovskite dissolved in dimethylformamide (DMF) are reported as a function of the solution concentration. A low perovskite solution concentration of 10% was selected as an acceptable value to avoid crystallization dewetting. The determined optimum substrate temperature of 150 °C, followed by annealing at 100 °C render the highest perovskite precursor conversion, as well as the highest possible droplet spreading, desired to achieve a continuous thin film. The number of spray passes was also tuned to achieve a fully-covered film, for the condition of the spray nozzle used in this work. This work demonstrates that applying the optimum substrate temperature decreases the standard deviation of the film thickness and roughness, leading to an increase in the quality and reproducibility of the large-area spray-on films. The optimum perovskite solution concentration and the substrate temperature are universally applicable to other spray coating systems. View Full-Text
Keywords: mixed halide perovskite; large area perovskite; spray coating; perovskite solution physical properties; perovskite film optimization mixed halide perovskite; large area perovskite; spray coating; perovskite solution physical properties; perovskite film optimization
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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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MDPI and ACS Style

Habibi, M.; Rahimzadeh, A.; Bennouna, I.; Eslamian, M. Defect-Free Large-Area (25 cm2) Light Absorbing Perovskite Thin Films Made by Spray Coating. Coatings 2017, 7, 42.

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