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Coatings 2017, 7(12), 215; https://doi.org/10.3390/coatings7120215

The Effect of Post-Baking Temperature and Thickness of ZnO Electron Transport Layers for Efficient Planar Heterojunction Organometal-Trihalide Perovskite Solar Cells

1
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan
2
Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan
3
Center for Reliability Sciences and Technologies, Chang Gung University, Taoyuan 33302, Taiwan
4
Department of Engineering and Science, National Tsing Hua University, Hsinchu 30013, Taiwan
5
Electro Organic Division, Central Electrochemical Research Institute, Karaikudi 630 006, Tamil Nadu, India
*
Authors to whom correspondence should be addressed.
Academic Editor: Brian W. Sheldon
Received: 31 October 2017 / Revised: 10 November 2017 / Accepted: 25 November 2017 / Published: 30 November 2017
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Abstract

Solution-processed zinc oxide (ZnO)-based planar heterojunction perovskite photovoltaic device is reported in this study. The photovoltaic device benefits from the ZnO film as a high-conductivity and high-transparent electron transport layer. The optimal electron transport layer thickness and post-baking temperature for ZnO are systematically studied by scanning electron microscopy, photoluminescence and time-resolved photoluminescence spectroscopy, and X-ray diffraction. Optimized perovskite solar cells (PSCs) show an open-circuit voltage, a short-circuit current density, and a fill factor of 1.04 V, 18.71 mA/cm2, and 70.2%, respectively. The highest power conversion efficiency of 13.66% was obtained when the device was prepared with a ZnO electron transport layer with a thickness of ~20 nm and when post-baking at 180 °C for 30 min. Finally, the stability of the highest performance ZnO-based PSCs without encapsulation was investigated in detail. View Full-Text
Keywords: zinc oxide; perovskite; photovoltaic; electron transport layer zinc oxide; perovskite; photovoltaic; electron transport layer
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Lee, K.-M.; Lin, C.-J.; Chang, Y.-H.; Lin, T.-H.; Suryanarayanan, V.; Wu, M.-C. The Effect of Post-Baking Temperature and Thickness of ZnO Electron Transport Layers for Efficient Planar Heterojunction Organometal-Trihalide Perovskite Solar Cells. Coatings 2017, 7, 215.

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