Rapid Growth of MAPbI3 Single Crystal by Inverse Temperature Crystallization
Ko-Chi Teng a, Tzu-Chien Wei a
a National Tsing Hua University, Department of Chemical Engineer R418 No. 101, Section 2, Kuang-Fu Road, Hsinchu, Taiwan 30013, R.O.C., Hsinchu, Taiwan, 30013, Taiwan, Province of China
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 037
Publication date: 7th November 2016

The organic-inorganic hybrid perovskite has been receiving considerable attention in photovoltaic and general optoelectronic applications due to its superior characteristics including high absorption coefficient, direct band gap, long carrier lifetime, and high hole and electron mobility. Methyl ammonium lead iodide is the most common structure ever explored until now, however, all MAPbI3–based solar cells have been based on polycrystalline MAPbI3 thin film. As there are plenty of grains, grain boundaries, voids, and surface defects within the film, it suffers from noticeable carrier recombination and instability. It’s reported that single-crystalline MAPbI3 possesses superior photovoltaic properties and stability due to less grains, grain boundaries, voids, and surface defects. Here we present a rapid crystal growth process to synthesize MAPbI3 single crystals by means of inverse temperature crystallization. Unlike general crystallization process, MAPbI3 precursor exists retrograde solubility in γ-Butyrolactone(GBL). We will explain this anomalistic phenomenon by the crystallization mechanism of MAPbI3 in GBL.

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