24 February 2016 Carrier injection and recombination processes in perovskite CH3NH3PbI3 solar cells studied by electroluminescence spectroscopy
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Abstract
Organic-inorganic hybrid perovskite materials, CH3NH3PbX3 (X = I and Br), are considered as promising candidates for emerging thin-film photovoltaics. For practical implementation, the degradation mechanism and the carrier dynamics during operation have to be clarified. We investigated the degradation mechanism and the carrier injection and recombination processes in perovskite CH3NH3PbI3 solar cells using photoluminescence (PL) and electroluminescence (EL) imaging spectroscopies. By applying forward bias-voltage, an inhomogeneous distribution of the EL intensity was clearly observed from the CH3NH3PbI3 solar cells. By comparing the PL- and EL-images, we revealed that the spatial inhomogeneity of the EL intensity is a result of the inhomogeneous luminescence efficiency in the perovskite layer. An application of bias-voltage for several tens of minutes in air caused a decrease in the EL intensity and the conversion efficiency of the perovskite solar cells. The degradation mechanism of perovskite solar cells under bias-voltage in air is discussed.
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Taketo Handa, Taketo Handa, Makoto Okano, Makoto Okano, David M. Tex, David M. Tex, Ai Shimazaki, Ai Shimazaki, Tomoko Aharen, Tomoko Aharen, Atsushi Wakamiya, Atsushi Wakamiya, Yoshihiko Kanemitsu, Yoshihiko Kanemitsu, } "Carrier injection and recombination processes in perovskite CH3NH3PbI3 solar cells studied by electroluminescence spectroscopy", Proc. SPIE 9745, Organic Photonic Materials and Devices XVIII, 97451I (24 February 2016); doi: 10.1117/12.2212052; https://doi.org/10.1117/12.2212052
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