Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
In perovskite solar cells (PSCs) the current density–voltage (J–V) curves have been found to present a hysteresis-like distortion when the measurement is done by sweeping the applied bias at different scan conditions. The so-called hysteresis effect has raised many concerns about the feasibility and long-term stability of this kind of photovoltaic technology. However, there is a absence of distinction among different hysteretic phenomena which is needed to unravel its underlying physical and chemical mechanisms. In our work we have distinguished between capacitive and noncapacitive currents giving rise to specific hysteretic responses in the J–V curves of PSCs. It has been found that capacitive current producing hysteresis dominates in regular structures with TiO2 as bottom electron selective layer. This is mainly caused by the charge, both ionic and electronic, accumulation ability of the TiO2/perovskite interface but has no influence on the steady-state operation. Noncapacitive hysteresis has been observed at slow enough scan rates in all kind of architectures. Inverted structures, including organic compounds as bottom hole selective layers and fullerene materials as top contact, show larger noncapacitive distortions that we associate with the inherent reactivity of contact materials and the absorber perovskite.
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