Controlling Perovskite Crystals for Water Resistance and Highly Efficient Solar Cells
Jianjun Tian a
a University of Science and Technology Beijing, 30 Xueyuan Road, Beijing, 100083, 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
Oral, Jianjun Tian, presentation 132
Publication date: 7th November 2016

Organic–inorganic halide CH3NH3PbI3 (MAPbI3) perovskite solar cells (PSCs) have attracted intensiveattention due to their high power conversion efficiency and low fabrication cost. However, MAPbI3 is known to be very sensitive to humidity, and the intrinsic long-term stability of the MAPbI3 film remainsa critical challenge. 2-Aminoethanethiol (2-AET) was used as a ligand to bridge the organic compound(MAI) and inorganic compound (PbI2), which restricts the fast growth of PbI2 to realize the synchronousgrowth environment of MAI and PbI2 crystals, resulting in the formation of a compact MAPbI3 film withpolygonal grains. Due to the compact (PbI2)–2-AET–(MAI) molecule barrier layers in the MAPbI3structure, the resulting perovskite films showed excellent intrinsic water-resistance, with the MAPbIperovskite crystal structure retained for a long time (>10 minutes) after immersion in water. This workmakes a step towards obtaining long-term stable MAPbI3 perovskite devices. In addition, thiourea was introduced into the MAPbI3 precursor for monolithic grains,  the perovskite solar cells performed an impressive 18.46% power conversion efficiency (PCE) and average PCE of 17.57±1.03%. 

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