Ultraviolet Photodetection with Low Detection Limit Using Inch-Sized Two-Dimensional Hybrid Perovskite Crystal

Ultraviolet (UV) photodetection is widely used in different fields, among which the photodetection with low detection limit has attracted strong interest due to broad applications in various fields including military security, medical diagnosis, and chemical analysis. Recently, two-dimensional (2D) hybrid perovskites are promising candidates for UV photodetection owing to their superior semiconducting properties and solution accessibility. Here, UV photodetection with low detection limit is successfully realized by using high-quality 2D hybrid perovskite single crystals, (BA)(2)PbBr4 (1, BA = C4H9NH3+). Grown via a delicate solution method, a high-quality single crystal of 1 as large as 35 x 15 x 1 mm(3) is obtained with a low trap density of approximate to 10(10) cm(-3), and used to fabricate photodetectors hence exhibiting an ultra-low dark current of 6.11 x 10(-13) A. The detector exhibits a considerable on/off ratio of approximate to 10(4), an impressive detectivity up to 2.06 x 10(12) Jones, and a responsivity of 16.9 mA W-1. Notably, due to the high-crystalline quality and low dark current of 1, the device shows remarkable photoresponse even under an extremely weak illumination of 80 nW cm(-2) at the UV region. This work provides a promising candidate for sensitive UV photodetection and high-performance photodetectors.

Automated summary

In this study, low detection limit UV photodetection was successfully achieved using high-quality 2D hybrid perovskite single crystals. The device showed remarkable photoresponse even under extremely weak UV illumination, making it a promising candidate for sensitive UV photodetection and high-performance photodetectors.