PVP-assisted synthesis and photoresponse property of Bi2S3 microflowers

Bi2S3 has attracted wide attention due to its application in photoelectric converter, but its preparation conditions are relatively complicated. The Bi2S3 microflowers, which are self-assembled from nanowires and have high photoelectric responsiveness, were synthesized by using polyvinylpyrrolidone (PVP) as structure guide under ethylene glycol solvent heat condition. The effects of different types of surfactants and different reaction time on the morphology of the products were also studied. In addition, a prototype device with photoconductive structure of visible light detection was assembled by using Bi2S3 microflowers and gold fork finger electrode as substrate. The photoresponse properties show that the photocurrent under simulated sunlight is about two orders of magnitude higher than the dark current, and the response time and decay time are 142 ms and 151 ms, respectively, indicating the photodetector has excellent photoelectric responsiveness; the light current is not attenuated by the periodic opening and closing of the photodetector, indicating that the photodetector has good stability.