Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Perovskite solar cells (PSCs) are investigated with both intensity-modulated photovoltage spectroscopy (IMVS) and the electrochemical impedance spectroscopy (EIS). Two resonance features are found in either IMVS or EIS results. After converting the IMVS results into current/voltage relationships, they are found to be the same as the EIS ones. Because the spatial distributions of the perturbing free carriers (either photogenerated or electrically injected) are apparently different, the similarity of the IMVS and EIS results excludes the redistribution/migration of free carriers as the dominant cause of the IMVS/EIS features. The pattern of the slower feature indicates it corresponds to migration (not recombination) of certain charged species, which could be either ions or accumulated carriers. Here, we assume they are mobile I- because the resonance time of the slower feature agrees with recently reported transit time of I- across the perovskite layer.1 The consistent power dependencies of the amplitudes of both features suggests that the mobile I- are also involved in the recombination related to the faster feature.23 Next, we find the IMVS is independent on the illumination spot size indicating the mobile ions could be readily spread to 5 mm away. The photogeneration of mobile ions and long migration distance agrees with earlier reports.4,5
This work was supported by MEXT under the Program for Development of Environmental Technology using Nano-technology (GREEN).
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