A Self-Powered and Flexible Organometallic Halide Perovskite Photodetector with Very High Detectivity

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 × 10¹³ 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 ≈90%. Moreover, as the PD is made of flexible and transparent polymer films, it can operate under bending and functions at 360 ° of illumination. As a result, the self-powered, flexible, 360 ° 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.

A flexible and self-powered organometallic halide perovskite photodetector is demonstrated that features an impressive detectivity of 1.22 × 10¹³ Jones and a large responsivity of up to 79.4 V mW⁻¹ cm². These results demonstrate a promising approach for developing a flexible and self-powered photodetector featuring high detectivity, responsivity, and excellent compatibility in various situations, particularly for outdoor applications.

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