S/In molar ratio effect on the photoconductivity of the sprayed β-In2S3 thin films

In2S3 thin films have been deposited onto glass substrates at 340 degrees C using an inexpensive spray pyrolysis method (CSP) via the reaction between high purity indium chloride and thiourea. Structural, optical and photoconductive properties of thin films have been investigated by adjusting S/In molar ratio. The X-ray diffraction results revealed that In2S3 films are polycrystalline and exhibited a cubic structure. The optical and morphological properties are discussed. The photoconductive performances were conducted by DC electrical characterization. The best photosensitivity was obtained for the film matching S/In = 2 molar ratio. In addition, photocurrent versus light intensity and bias voltage follows a power law and linear trend, respectively. Furthermore, some critical parameters such as responsivity and detectivity were determined to evaluate photosensitive properties of In2S3 thin films.

Automated summary

In this study, In2S3 thin films were successfully deposited on glass substrates using a spray pyrolysis method, and their photoconductive properties were investigated by adjusting the S/In ratio. The best photosensitivity was achieved when the S/In ratio was 2. The relationship between photocurrent and light intensity follows a power law, while the relationship with bias voltage is linear.