Abstract
The self-powered photodetector (PD) with low energy-consumption is one of the main research direction of the next-generation photoelectric devices. In this paper, a PD driven by ferroelectric polarization based on the CH3NH3PbI3 single crystal (100) plane is realized for the first time. The differential scanning calorimetry (DSC) curves of the single crystal and the photocurrent of the device at different temperatures indicate that the crystal possesses a high Curie temperature of 330 K. The working mechanism of self-powered device is demonstrated by characterizing the ferroelectricity and the surface charge distribution on the CH3NH3PbI3 single crystal (100) plane. The distortion of the [PbI6] octahedron in the unit cell causes crystal polarization, which provides a driving force for the directional movement of photogenerated carriers within the crystal. The influence of channel direction and channel size on device performance is further studied. The device with a simple structure of Au/CH3NH3PbI3/Au achieves an excellent detection performance. The maximum responsivity is 0.16 A/W, the maximum on–off switching ratio is 1.41 × 104, and the photocurrent of the self-powered device has not been attenuated after continuous operation for 2 h. This provides a design strategy for exploring new self-powered 3D hybrid perovskite PD with broad photoelectricity applications.
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