We have demonstrated significant photoconductance in indium sulfide thin films prepared by thermal vacuum evaporation ofIn2$3 powders synthesized in-house by chemical precipitation ofInCl3 or In(CH3COO)3, and (NH4)2S or Na2S. The Delta G lambda/Gdark values have been as high as 0.1 in the initial unoptimized films. Excess sulfur (via a mixture of polysulfide and sulfide ions in the synthesis bath) appears to be important in achieving reproducible and large photoconductivities. In2S3 is particularly attractive as a lower toxicity alternative to CdS in optoelectronic applications such as photovoltaic and photoconductive cells.
Barber, Chris; Engelken, Robert; Kemp, Brandon; Aleem, Wasim; Khan, Imran; Edrington, Chris; Buck, Michael; Workman, Clayton; Thapa, Anup; and Jakobs, Tom
"Preparation of Powder Precursors and Evaporation of Photoconductive Indium Sulfide Films,"
Journal of the Arkansas Academy of Science: Vol. 51
, Article 5.
Available at: http://scholarworks.uark.edu/jaas/vol51/iss1/5