Ultra-broadband, Ultraviolet to Terahertz and High Sensitivity CH3NH3PbI3 Perovskite Photodetectors.

Owning to the unique optical and electronic properties, organic-inorganic hybrid perovskites have made impressive progress in photodetection applications. However, achieving ultra-broadband detection over the ultraviolet (UV) to terahertz (THz) range remains a major challenge for perovskite photodetectors. Here, we report an ultra-broadband (UV-THz) dual-mechanism photodetector based on CH3NH3PbI3 films. The photoresponse of the PD in UV-Visible (Vis) and near infrared (NIR)-THz band is mainly caused by photoconductive (PC) effect and bolometric effect, respectively. High responsivity ranging from 105 mA W-1 to 102 mA W-1 are acquired within UV-THz bands under 1 V bias voltage at room temperature. Moreover, the device also shows fast rise and decay times of 76 and 126 ns under 1064 nm laser illumination, respectively. This work provides insight into the thermoelectric characteristics of perovskite and offers a new way to realize ultra-broadband photodetectors notably for THz detector at room temperature.

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