High-performance transparent ultraviolet photodetectors based on inorganic perovskite CsPbCl3 nanocrystals

Abstract

Inorganic lead halide perovskite nanocrystals (CsPbCl₃ NCs) with excellent ultraviolet (UV) light absorption, high carrier mobility, long carrier diffusion lengths, and long-term stability are good candidates as smart materials for transparent optoelectronic devices. In this study, transparent UV photodetectors (PDs) based on CsPbCl₃ NCs were fabricated for the first time. The optimized device exhibited visible light transmittance approximately 90%, strong absorption of UV light in the wavelength from 300 nm to 410 nm, good photoresponsivity (1.89 A W⁻¹), and a high on/off ratio (up to 10³). Meanwhile, the rise and decay response times of the device were less than 41 ms and 43 ms, respectively. Furthermore, we performed detailed analysis of the effects by employing CsPbCl₃ NCs in assembled films and final devices using various characterization methods. The simple fabrication and remarkable UV photodetection capabilities of CsPbCl₃ NCs make them promising semiconducting candidates in optoelectronic applications.