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Materials 2018, 11(8), 1417;

Effect of Ammonium Halide Additives on the Performance of Methyl Amine Based Perovskite Solar Cells

School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea
Department of Chemical and Biomolecular Engineering, the University of Hong Kong Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Authors to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 6 August 2018 / Accepted: 8 August 2018 / Published: 13 August 2018
(This article belongs to the Special Issue Advances in Organic and Perovskite Solar Cells)
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CH3NH3PbI3-xClx species were fabricated as light-absorbing layers for perovskite solar cells (PSCs), by employing NH4I, NH4Br, and NH4Cl as additives via annealing at 100 °C for different times. Solutions containing CH3NH3I, PbI2, and PbCl2 (4:1:1 molar ratio) in N,N-dimethylformamide were used to prepare perovskites with NH4I, NH4Br, and NH4Cl as additives, at concentrations of 0.1 M and 0.3 M. The additives helped increase the grain size and reduce pinholes in the perovskite films, as confirmed by field-emission scanning electron microscopy. The X-ray diffraction profiles of CH3NH3PbI3-xClx clearly showed peaks at 14° and 28° for the samples with additives, indicative of crystallinity. The best PSC performance with a power conversion efficiency of 9.13%, was achieved using 0.1 M NH4I by annealing for 5 min, whereas the power conversion efficiency of the perovskite solar cells without additives was 5.40%. View Full-Text
Keywords: perovskite structure; perovskite solar cells; additive; ammonium halide perovskite structure; perovskite solar cells; additive; ammonium halide

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Heo, D.Y.; Luo, Z.; Kim, S.Y. Effect of Ammonium Halide Additives on the Performance of Methyl Amine Based Perovskite Solar Cells. Materials 2018, 11, 1417.

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