Abstract
This article was committed to synthesizing thin films of 4-tricyanovinyl-N,N-diethylaniline (TCVA) by the thermal evaporation technique. The UV light then irradiated these films for different exposure times. Infrared spectroscopy demonstrated that the evaporation method is a good one to get un-dissociated TCVA films, and these films have excellent radiation stability. The x-ray diffraction pattern at room temperature confirms TCVA films have a nanocrystalline structure. These films are transformed into the amorphous structure after UV irradiation, indicating the increase of the disorder in these films. The optical spectroscopy of TCVA films was recorded before and after irradiation. It was found that the optical band gap decreases from 1.56 to 1.49 eV, and Urbach's energy increases after UV irradiation. The electrical studies showed that the value of electrical conductivity increases and the value of activation energy decreases after UV irradiation.