All-inorganic perovskite CsPbBr3 microstructures growth via chemical vapor deposition for high-performance photodetectors

Abstract

Perovskite cesium lead halide (CsPbBr₃) has attracted considerable attention due to its excellent optoelectronic properties and superior stability against moisture, oxygen, light, and heat. In this work, the micro-environment controlled chemical vapor deposition (CVD) method has been adopted to synthesize high-quality single-crystalline CsPbBr₃ microstructures, including microwires, microplates and triangular pyramids. Moreover, the structure–activity relationship between the material microstructures and the device properties is illustrated. The results show that photodetectors based on a single horizontal CsPbBr₃ microwire exhibit a high responsivity (312.2 A W⁻¹) and a fast response time of 5.8 ms. Photodetectors based on a single CsPbBr₃ microplate exhibit a responsivity of 1.74 A W⁻¹ and a response of 10 ms. These results indicate that the CsPbBr₃ microwire photodetector is characterized by a higher photodetector performance when compared to the microplate due to its excellent crystallization quality and the Fabry–Pérot cavity effect in the microwire. Furthermore, the flexible CsPbBr₃ microwire photodetector was demonstrated on a mica substrate. The results show that the photocurrent can be maintained at 90% after 3000 cycles at a bending radius of 2.5 mm. This work demonstrates the structure–activity photodetector performance, which is essential to develop a full understanding about high-performance optoelectronic devices based on all-inorganic lead halide perovskite materials.