Antisolvent-Processed One-Dimensional Ternary Rubidium Copper Bromine Microwires for Sensitive and Flexible Ultraviolet Photodetectors

Abstract

Recently, newly emerging halide perovskites have aroused intensive attention in photoelectric fields in virtue of their good properties, such as well-balanced carrier transport, large light absorption coefficient, tunable band gap, and low-temperature solution processing technique. Nevertheless, their future commercial development is severely hampered by lead toxicity and instability of such materials. In this work, one-dimensional Rb2CuBr3 single-crystal microwires (MWs) were prepared by antisolvent engineering, and they were further employed as absorbers to prepare sensitive ultraviolet (UV) photodetectors. The optical band gap of Rb2CuBr3 MWs is measured to be 3.83 eV, exhibiting an excellent UV absorption. The fabricated device demonstrates a remarkable UV light detection ability with a specific detectivity of 1.23 × 1011 Jones, responsivity of 113.64 mA W–1, and response speed of 69.31/87.55 ms under light illumination of 265 nm. Meanwhile, the proposed photodetector without any encapsulation shows outstanding stability and repeatability. After storing in ambient air for 2 weeks, the light detection ability remains basically unchanged. Further, a flexible photodetector was fabricated with the same structure, which demonstrates a remarkable bending endurance. These results confirm the great potential of Rb2CuBr3 for high-performance UV photodetectors, increasing the possibility for assembly of optoelectronic systems.

Morphology‐Controllable Perovskite‐Like RbCu2Br3 Single Crystals with Strong Photoelectronic Anisotropy for UV Detection

“…Figure 5b shows the I-T curve of this photodetector as a function of bias voltage, which indicates a stable and recyclable photo response. In order to evaluate its ability to generate an output optical signal with a given input one, responsivity R defined by the photocurrent generated at the unit incident optical power is introduced, and the formula is as follows: [2,24] ph dark…”

Sunscreen-Inspired ZnO/PEG Composites for Flexible Ultraviolet Photodetectors with a Giant On–Off Ratio

“…Ultraviolet (UV) radiation is a class of short-wavelength and high-energy electromagnetic radiation, which has far-reaching effects on organic life. − Although UV radiation accounts for ∼10% of the total solar radiation, identifying and detecting UV radiation is of great importance to human daily life. − An ultraviolet photodetector is a kind of sensor that can convert an ultraviolet light signal into an electric signal, which has a wide range of applications in environmental monitoring, geological exploration, space communication, and chemical and pharmaceutical analyses. − Compared to photodetectors based on rigid substrates, flexible devices can be better shaped and adapted to different curved surfaces. Moreover, the lightweight and portability of flexible photodetectors enable them for new applications in wearable electronics and other high-tech areas. − For example, Zhou et al.…”

Switchable biexcitons in perovskite-like RbCu2Br3 crystals driven by thermally induced phase transition

“…However, the current research on them has obvious limitations, mainly focusing on the basic representation, and the comprehensive exploration of the phenomenon and the explanation of the underlying physical mechanism are insufficient. 2,26–29 According to the first-principles calculations conducted by Yin et al on CHPs, still a large number of potential phase-stable materials are there to be discovered. 30…”

“…However, the current research on them has obvious limitations, mainly focusing on the basic representation, and the comprehensive exploration of the phenomenon and the explanation of the underlying physical mechanism are insufficient. 2,[26][27][28][29] According to the first-principles calculations conducted by Yin et al on CHPs, still a large number of potential phase-stable materials are there to be discovered. 30 Herein, we first successfully grew one-dimensional electronic structure RbCu 2 Br 3 crystals with large size and high quality characteristics directly through a liquid-phase method applied to RbBr and CuBr.…”