Compositional engineering of cost efficient durable perovskite solar cells
Tsutomu Miyasaka a
a Toin University of Yokohama, Graduate School of Engineering, 1614 Kuroganecho, Aoba, Yokohama, 225-8503, Japan., Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Kyōto-shi, Japan, 2019 January 27th - 29th
Organizers: Hideo Ohkita, Atsushi Wakamiya and Mohammad Nazeeruddin
Oral, Tsutomu Miyasaka, presentation 016
Publication date: 23rd October 2018

Since our start of the photovoltaic cell using organo lead halide perovskites in 2005,1 cell performance recorded a rapid boost in efficiency that has been never experienced by other photovoltaic semiconductors. Although power conversion efficiency (PCE) achieved high value (23.3%), to reap the benefit of low cost perovskite photovoltaic devices is to establish an ambient air-based fabrication of a high performance and stable device by a simple solution process without use of dry oxygen-free chamber and high temperature treatments. We have established ambient atmosphere solution processes to fabricate glass-based triple cation perovskite solar cells (PCE>21%)2 and plastic-film based perovskite solar cells (PCE 18%) both of which maintain good performance under weak incident light (1 mA/cm2). However, a drawback of perovskite device is due to use of thermally unstable hole transporter such as spiro-OMeTAD. To improve this P3HT is one of thermally stable materials. In our collaboration with JAXA, P3HT-based perovskite devices showed high durability by exposure to impacts of high (100oC) and low (-80oC) temperatures and high tolerance to large fluence proton and electron radiations, which is rare advantage of defect tolerant nature of thin film perovskite absorbers.3 We could improve the performance of highly durable P3HT perovskite solar cells to have efficiency above 15% by modifying the quality of P3HT film to have moisture-resistant surface. To reduce the process cost, low temperature coating of metal oxide electron collectors have been extensively studied in our group. This method was applied to the use of MA-free perovskite composition (CsFAPbI3, CsPbI3, etc.)4 that have high thermal stability. Direction of such challenges is to realize a perovskite photovoltaic device that has benefits of low cost, high performance, and high thermal and anti-moisture durability in practical use. The on-going studies on perovskite photovoltaics in our group will be summarized in the talk.

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