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. (c) 2005 Elsevier B.V. All rights reserved.