Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Mismatch of current (I) – voltage (V) curves respect to the scan direction, so called I-V hysteresis is a critical issue in MAPbI3 perovskite solar cells. Several mechanisms such as ion migration, charge trapping/detrapping and accumulation, which yield to the presence of very large capacitances in the perovskite, have been proposed as the basis for the hysteresis phenomena. On the other hand, moisture has demonstrated being an important factor in the fabrication, performance and long term stability of perovskite solar cells. In previous researches, it has been shown that the absorption of humidity from environment increases both the conductivity and the capacity of MAPbI3 films. While the increase in the conductivity has been associated to the formation of perovskite mono and di-hydrates, the rise in capacitance may attain values as large as those found for charge accumulation phenomena commented above. In the present work, we show how the hysteretic behaviour of a MAPbI3 solar changes as a function of the environmental moisture conditions during the measurement from normal to inverted hysteresis.
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