Organic-Inorganic Halide Perovskites: Photovoltaics, LED and ReRAM
Nam-Gyu Park a
a Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, 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
Invited Speaker, Nam-Gyu Park, presentation 087
Publication date: 7th November 2016

Since the first report on the solid-state perovskite solar cell with power conversion efficiency (PCE) of 9.7% in 2012 by our group, its certified PCE now reaches 22%. It is believed that perovskite solar cell is promising next-generation photovoltaics (PVs) due to superb performance and very low cost. In this talk, grain boundary healing process for high PCE MAPbI3 perovskite solar cell will be described. Nonstoichiometric precursor induces self-formed grain boundary layers that lead to long carrier life time of perovskite, which eventually results in high open-circuit voltage and fill factor. Moreover, self-formed grain boundary plays important role in charge transporting, where charge conduction is pronounced. Grain boundary healing process yields PCE as high as 20.4%. Organic-inorganic halide perovskite extends its functionality from PV to light emitting diode (LED) and non-volatile resistive random access memory (ReRAM) applications. We have demonstrated a highly efficient green LED based on monocrystalline MAPbBr3 film and a millivolt switching ReRAM along with ~107 on-off ratio based on metal/perovskite/metal structure.

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