期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 8, 期 3, 页码 995-1004出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee03664f
关键词
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资金
- European Union [604032]
- Sciex fellowship [12.249]
- European Research Council (ERC) [ARG 247404]
In this work we show that the rate-dependent hysteresis seen in current-voltage scans of CH3NH3PbI3 perovskite solar cells is related to a slow field-induced process that tends to cancel the electric field in the device at each applied bias voltage. It is attributed to the build-up of space charge close to the contacts, independent of illumination and most likely due to ionic displacement, which is enhanced when the device undergoes aging. This process can also lead to a reduction of the open-circuit voltage or the steady-state photocurrent and does not directly correlate with the development of the hysteresis if it is measured at a fixed voltage sweep rate.
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