Effect of air annealing on the optical electrical and structural properties of carbazole thin films

Thin films of carbazole films have been prepared using vacuum sublimation technique. Post-evaporation annealing is done for various periods of time. The optical absorption spectrum is recorded and the band gap is calculated from the observed spectrum. The current–voltage characteristics are studied for the sandwiched structure of carbazole thin films with silver electrodes. From the J–V characteristics trap density and number of thermally generated charge carriers are determined. Their structure and grain size have been determined from the X-ray diffraction studies.