Preparation of Flexible Perovskite Solar Cells with Gas Pump Drying Method on Plastic Substrate
Guan-Jun Yang a, Bin Ding a
a Xian Jiao Tong University, No.28, Xianning West Road, Xian, 710049, China
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Bin Ding, 162
Publication date: 28th March 2016

A uniform and full coverage perovskite film is of significant importance to flexible perovskite solar cells. When there are some pinholes in the perovskite film or even many bared substrate surface without perovskite covering, current shunting in the carrier transportation would inevitablly occur, which degrades the device performance. In this talk, we reported the preparation of flexible perovskite solar cells on plastic substrate with gas pump drying method. We could obtain dense, uniform and full coverage perovskite film using gas pump drying method. The perovskite CH3NH3PbI3 films were prepared on flexible ZnO coated ITO-PEN substrate by this novel gas pump drying process, and AFM results show that the film presented an extremely smooth surface morphology with a root mean square roughness of 15.8 nm in a large and representative scan area of 18×18 µm2. Furthermore, the flexible planar perovskite solar cell was fabricated, and all devices were prepared at 100 °C or below in air condition. The highest efficiency on flexible substrates had reached 11.34% with an average efficiency of 8.93% for 14 solar cell devices. We bent the flexible planar perovskite solar cell to a small radius of just 4.5 mm, which is one of the highest bending extent (the smallest radius). Extremely small degradation of the efficiency of the flexible perovskite solar cell was found within 30 bending cycles. This suggested a quite good flexibility of the flexible perovskite solar cell. After the further 10 bending cycles, the devices exhibited 67% of initial efficiency. The decrease of efficiency during severe bending may be attributed to degradation of the device layers. The results indicate that one-step gas pump drying process is an excellent method to prepare flexible solar cells. It is worth to note that this gas pump drying method can be operated just in air.



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