Optical Studies of poly (N-carbazole) (PVK) Blending With Polyvinylpyrrolidone (PVP) Using Tauc/Davis-Mott Model

摘要

The optical absorption spectra of blended poly (N-carbazole) (PVK) with polyvinylpyrrolidone (PVP) in various compositions are investigated. A doctor blade technique was used to coat the blended polymer on a quartz substrate. The electronic parameters such as absorption edge (E_e), allowed direct band gap (E_d), allowed indirect band gap (E_i), Urbach edge (E_u) and steepness parameter (γ) were calculated using Tauc/Davis-Mott Model. The results reveal that the E_e, Ed and E_i increase with increasing of PVP ratio. There also have variation changing in Urbach energy and steepness parameter.