Solution-processed flexible planar perovskite solar cells: A strategy to
Jeongwon Lee a, Kyungeun Jung a, Man-Jong Lee
a Konkuk univ, 1 Hwayang-dong, Gwangjin-ku, Seoul 143-701, KOREA, Seoul, 143, Korea, Republic of
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster, Kyungeun Jung, 013
Publication date: 7th November 2016

This paper reports a synergistic strategy to enhance the power conversion efficiency (PCE) of flexible planar perovskite solar cells (PSCs) by controlling the thickness of the ZnO electron transport layer (ETL), PbI2 phase, and size/morphology of the perovskite (MAPbI3) absorber layer. To optimize the size/morphology of MAPbI3 via a modifed two-step spin coating process, various volumes of CH3NH3I precursor solutions with a constant concentration were continuously coated, which greatly affected the grain growth condition of the MAPbI3. In addition, the remnant PbI2 phase in the MAPbI3, which acted as a recombination barrier, was simultaneously optimized for higher efficencies. This strategic method to synergistically combine the major factors affecting the final PCE resulted in the best efficiency of 12.3%, which is the highest efficiency among ZnO-ETL-based flexible planar PSCs to date. The flexible PSCs reported in this study will impact the development of highly effcient flexible wearable energy sources with imperoved bending durable performance.

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