High performance photodetectors based on In2S3, In2S1.5Se1.5 and In2Se3 nanostructures

Abstract

One-dimensional (1D) nanostructures, including nanofibers, nanocubes, and nanoplates of In₂S₃, In₂S_1.5Se_1.5, and In₂Se₃ semiconductors, were synthesized using a hydrothermal technique for studying their photodetector behaviour. Photocurrent measurements demonstrate that semiconducting In₂Se₃ 1D nanofibers display an exceptional response to white light, with a photo responsivity of 185.8 mA W⁻¹ and a detectivity of 22.6 × 10⁹ Jones, which is four times greater than that of In₂S₃ and In₂S_1.5Se_1.5 nanostructures. The response times of the In₂Se₃ photodetectors are impressively short, measuring only 8.8 seconds. The superior responsivity detectivity and faster response time of the 1D In₂Se₃ nanofibers can be attributed to their large surface area, which boosts light absorption and facilitates efficient charge transfer, thereby enhancing the overall device performance.