In situ investigation of halide incorporation into perovskite solar cells


Here we report on the material chemistry following crystallization in the presence of water vapor of chlorinated formamidinium lead-triiodide (NH2CH = NH2PbI3−xClx) perovskite films. We found in-situ exposure to water vapor reduces, or possibly eliminates, the retention of chlorine (Cl) inside NH2CH = NH2PbI3−xClx crystals. There is a strong tendency toward Cl volatility, which indicates the sensitivity of these materials for their integration into solar cells. The requisite for additional efforts focused on the mitigation of water vapor is reported. Based on the in situ results, hot casting (<100 °C) in dry conditions demonstrates improved film coverage and Cl retention with efficiencies reaching 12.07%.

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This work was supported by the National Renewable Energy Laboratory as a part of the Non-Proprietary Partnering Program under Contract No. DE-AC36-08-GO28308 within the U.S. Department of Energy. TGH and the hot-stage in situ STEM work were supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division under grant number 2013LANL8400.

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Correspondence to Jeffery A. Aguiar.

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Aguiar, J.A., Alkurd, N.R., Wozny, S. et al. In situ investigation of halide incorporation into perovskite solar cells. MRS Communications 7, 575–582 (2017).

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