Excess Charge-Carrier Induced Instability of Hybrid Perovskites
Journal Article - Open Access
University of North Carolina Chapel Hill United States
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Identifying the origin of intrinsic instability for organicinorganic halide perovskites OIHPs is crucial for their application in electronic devices, including solar cells, photodetectors, radiation detectors, and light-emitting diodes, as their efficiencies or sensitivities have already been demonstrated to be competitive with commercial available devices. Here we show that free charges in OIHPs, whether generated by incident light or by current-injection from electrodes, can reduce their stability, while efficient charge extraction effectively stabilizes the perovskite materials. The excess of both holes and electrons reduce the activation energy for ion migration within OIHPs, accelerating the degradation of OIHPs, while the excess holes and electrons facilitate the migration of cations or anions, respectively. OIHP solar cells capable of efficient charge-carrier extraction show improved light stability under regular operation conditions compared to an open-circuit condition where the photo-generated charges are confined in the perovskite layers.
- Electricity and Magnetism
- Solid State Physics
- Electrooptical and Optoelectronic Devices