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Deep level trapped defect analysis in CH3NH3PbI3 perovskite solar cells by deep level transient spectroscopy

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Abstract

We report the presence of defects in CH3NH3PbI3, which is one of the main factors that deteriorates the performance of perovskite solar cells. Although the efficiency of the perovskite solar cells has been improved by curing defects using various methods, deeply trapped defects in the perovskite layer have not been systematically studied, and their function is still unclear. The comparison and analysis of defects in differently prepared perovskite solar cells reveals that both solar cells have two kinds of deep level defects (E1 and E2). In the one-pot solution processed solar cell, the defect state E1 is dominant, while E2 is the major defect in the solar cell prepared using the cuboid method. Since the energy level of E1 is higher than that of E2, the cuboid solar cell shows higher open-circuit voltage and efficiency.

Graphical abstract: Deep level trapped defect analysis in CH3NH3PbI3 perovskite solar cells by deep level transient spectroscopy

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Publication details

The article was received on 31 Jan 2017, accepted on 24 Feb 2017 and first published on 24 Feb 2017


Article type: Communication
DOI: 10.1039/C7EE00303J
Citation: Energy Environ. Sci., 2017, Advance Article
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    Deep level trapped defect analysis in CH3NH3PbI3 perovskite solar cells by deep level transient spectroscopy

    S. Heo, G. Seo, Y. Lee, D. Lee, M. Seol, J. Lee, J. Park, K. Kim, D. Yun, Y. S. Kim, J. K. Shin, T. K. Ahn and M. K. Nazeeruddin, Energy Environ. Sci., 2017, Advance Article , DOI: 10.1039/C7EE00303J

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