Influence of Annealing on the Optical Properties of Polyacrylonitrile Thin Films

In this paper, a polyacrylonitrile polymer was prepared and study its optical properties with different temperatures a films clear change from light brown to very dark brown at a temperature range (25- 280⁰C), although the polymer is characterized by high transparency and analyzing the absorbance spectrum of the prepared films, the direct energy gap was calculated, which was in the range of 4.01eV for without annealing films to decrease to 1.63eV for films annealing at a temperature of 280⁰C with these changes in properties, these films can be used in optical applications such as solar cells and photodetectors.