Abstract
Flexible and self-powered photodetectors (PDs) are highly desirable for applications in image sensing, smart building, and optical communications. In this paper, a self-powered and flexible PD based on the methylammonium lead iodide (CH3NH3PBI3) perovskite is demonstrated. Such a self-powered PD can operate even with irregular motion such as human finger tapping, which enables it to work without a bulky external power source. In addition, with high-quality CH3NH3PBI3 perovskite thin film fabricated with solvent engineering, the PD exhibits an impressive detectivity of 1.22 x 10(13) Jones. In the self-powered voltage detection mode, it achieves a large responsivity of up to 79.4 V mW(-1) cm(-2) and a voltage response of up to approximate to 90%. Moreover, as the PD is made of flexible and transparent polymer films, it can operate under bending and functions at 360 angstrom of illumination. As a result, the self-powered, flexible, 360 angstrom omnidirectional perovskite PD, featuring high detectivity and responsivity along with real-world sensing capability, suggests a new direction for next-generation optical communications, sensing, and imaging applications.