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In this study, we have discussed how grain sizes of CH3NH3PbI3 perovskites have an impact on the photovoltaic parameters such as a short-circuit current density Jsc, an open-circuit voltage Voc, and hence a power conversion efficiency PCE. As a result, we found that the device with larger grains exhibits the better photovoltaic parameters. The highest PCE was as high as 19.4%, which was obtained for...
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