| Citation: | FANG Xiang-ming, ZHANG Rong-ke, SUN Yu, WU Wei-yu, ZHU Jian-hua, YOU Xiu-fen, GAO Shi-yong. Bi2O3/Bi2S3 heterojunction composite preparation and photodetection performance[J]. Chinese Optics. doi: 10.37188/CO.2024-0218
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The Bi2O3/Bi2S3 heterojunction composite was prepared by thermal polymerization combined with room temperature solution method, and its micromorphology, crystal structure and elemental composition were characterized. The results demonstrate that the Bi2O3/Bi2S3 heterojunction composite exhibits a bulk morphology, accompanied by the presence of pores and a relatively rough surface. Based on the Bi2O3/Bi2S3 heterojunction composite, the photodetector was fabricated and its photodetection performance was measured under zero bias voltage. When exposed to ultraviolet (UV) light, the maximum photocurrent (0.32 μA) and response speed (65.65/80.56 ms) of the Bi2O3/Bi2S3 photodetector are significantly enhanced compared to those of the Bi2O3 photodetector. In addition, the device exhibits a wide photodetection band from the ultraviolet (UV) to the visible (Vis) spectrum, as well as fast and stable self-driven photodetection capability. This is mainly attributed the successful coupling of Bi2O3 and Bi2S3 with a narrow band gap, resulting in the formation of a heterojunction composite that exhibits a type II band structure. It is noteworthy that the photodetection performance of the device was measured by continuously alternating between blue light on and off for 100 times. This indicates that the Bi2O3/Bi2S3 photodetector exhibits excellent cycle stability.
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