This paper describes a new organic thin film (OTF) (50 nm) which was deposited by spin coated at room temperature. OTF has been constructed from chemically synthesized poly(pentachlorophenyl methacrylate-co-glycidyl methacrylate). Optical properties of the obtained poly(pentachlorophenyl methacrylate-co-glycidyl methacrylate) in solution were tested by ultraviolet-visible absorption spectroscopy. The analysis of the optical absorption data revealed an existence of a direct and indirect transition optical band gap (E-g). The electrical properties of ITO/PEDOT:PSS/OTF/Al heterojunction structure has been investigated by forward and reverse bias current-voltage (I-V) measurements at room temperature. The main electrical parameters such as barrier height (I broken vertical bar(Bo)), ideality factor (n) and reverse saturation current (I-o) have been calculated by applying thermionic emission theory as 0.80 eV, 3.69, 1.86 x 10(-8) A respectively. Additionally, series resistance (R-s), I broken vertical bar(Bo) and n were calculated from the forward bias I-V data using the methods of Cheung and Cheung with Norde and showed that these methods can be applied successfully for this structure.