Cu - As - S thin films were deposited using the thermal evaporation technique. Optical transmission spectra of Cu0,1As2,1S3,1 thin films were measured within the temperature range 77 - 300 K. Temperature behaviour of absorption edge inherent to Cu0,1As2,1S3,1 thin films was studied. Temperature and compositional dependences of optical parameters in Cu - As - S thin films have been analyzed. It has been revealed that the energy pseudogap decrease and Urbach energy increase with the copper content increase take place in Cu - As - S thin films. The influence of order-disorder processes on optical properties of Cu - As - S thin films has been discussed.

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