Continuous Megasonic Spray Coating System for Fabrication of Highly Reproducible Large-area Perovskite Solar Cells
Mincheol Park a b, Seung Chan Hong a b, Mansoo Choi a b, Junseop Byeon a b, Yeoun Woo Jang a b
a Global Frontier Center for Multiscale Energy Systems
b Department of Mechanical and Aerospace Engineering, Seoul National University
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Mincheol Park, 217
Publication date: 11th February 2019

A simple, low-cost, large area and continuous scalable coating system is proposed for the fabrication of hybrid organic-inorganic perovskite solar cells (PSCs). We developed a megasonic spray coating system utilizing 1.7 MHz megasonic nebulizer that could fabricate reproducible large-area planar efficient perovskite films. The system demonstrates a unique technique that could be easily adapted to polymer substrates, large-area devices, and large-area modules with its low temperature and ambient conditions. Our system was shown to fabricate uniform large-area perovskite film with large-sized grain since smaller and narrower sized mist droplets could be generated by megasonic spraying than those by existing ultrasonic spray methods. We control the volume flow rate of the CH3NH3PbI3 precursor solution, the reaction temperature and scan speed of the system, to obtain high quality perovskite active layer. We fabricate PSCs achieving best power conversion efficiencies (PCEs) of 18.6%, and average PCEs of 17.2% ± 0.6% from 32 sub-cells, using a perovskite coating area of 100 cm2. Our megasonic spray coating approach is therefore expected to be suitable for large‐area continuous coating in PSCs, which makes it suitable for application in commercial roll‐to‐roll processing.

This work was supported by the Global Frontier R&D Program of the Center for Multiscale Energy Systems funded by the National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea (2012M3A6A7054855).

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