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- W3028341824 abstract "Negative capacitance at the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, where the origin is still under discussion. Here we use Impedance Spectroscopy to analyse these responses in methylammonium lead bromide cells treated with lithium cation at the electron selective layer/perovskite interface and in iodide devices exposed to different relative humidity conditions. Employing the Surface Polarization Model, we obtain a time constant associated to the kinetics of the interaction of ions/vacancies with the surface, {tau}kin, in the range of 10^0 - 10^2 s for all the cases exhibiting both features. These interactions lead to a decrease in the overall recombination resistance, modifying the low-frequency perovskite response and yielding to a flattening of the cyclic voltammetry. As consequence of these results we find that that negative capacitance and inverted hysteresis lead to a decrease in the fill factor and photovoltage values." @default.
- W3028341824 created "2020-05-29" @default.
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- W3028341824 date "2020-05-24" @default.
- W3028341824 modified "2023-10-11" @default.
- W3028341824 title "Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells" @default.
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