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- W2333145971 abstract "We investigate the ferroelectric properties of photovoltaic methylammonium lead halide CH3NH3PbI3 perovskite using piezoelectric force microscopy (PFM) and macroscopic polarization methods. The electric polarization is clearly observed by amplitude and phase hysteresis loops. However, the polarization loop decreases as the frequency is lowered, persisting for a short time only, in the one second regime, indicating that CH3NH3PbI3 does not exhibit permanent polarization at room temperature. This result is confirmed by macroscopic polarization measurement based on a standard capacitive method. We have observed a strong increase of piezoelectric response under illumination, consistent with the previously reported giant photoinduced dielectric constant at low frequencies. We speculate that an intrinsic charge transfer photoinduced dipole in the perovskite cage may lie at the origin of this effect." @default.
- W2333145971 created "2016-06-24" @default.
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- W2333145971 date "2015-04-02" @default.
- W2333145971 modified "2023-10-18" @default.
- W2333145971 title "Polarization Switching and Light-Enhanced Piezoelectricity in Lead Halide Perovskites" @default.
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- W2333145971 doi "https://doi.org/10.1021/acs.jpclett.5b00502" @default.
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