Photoconductivity of sensitized poly( N-ethyl carbazole)methane with 2,4,7-trinitrofluorenone

Abstract

Photoconductivity of poly( N-ethyl carbazolyle)methane was greatly enhanced in the visible region by the addition of a small amount of 2,4,7-trinitrofluorenone having a molar ratio of monomer:dopant from 1:0.06 to 1:0.3. The current-voltage characteristics were studied in the visible wavelength range, and the current increased superlinearly with the increase of doping level. The activation energies for dark and photoconductivity are 0.244–0.202 eV and 0.238–0.194 eV, respectively, at different doping levels. The photoresponse shows two charge transfer bands corresponding to two transitions of the complex.