Poly-n-epoxypropylcarbazole complexes photocapacitive detectors

In this study a device based on a mixture of photosensitive organic semiconductors poly-N-epoxypropylcarbazole (PEPC) and Copper Phthalocyanine (CuPc) is investigated as a photocapacitive detector. We deposit thin films of the PEPC-CuPc from their solution in toluene or dioxane on a conductive glass (CG) to fabricate CG/PEPC-CuPc/Ag photocapacitive detectors. It is observed that under filament lamp illumination of up to 2000 lx the capacitance of the CG/PEPC-CuPc/Ag photoca-pacitive detectors increases by 8 time with respect to dark conditions when the concentration of CuPc in the polymer is equal to 85 wt.%. The photoconductivity of the detectors increases with illumination. It is assumed that the photocapacitive response of the detectors is associated with polarization occurring due to the transfer of photo-generated electrons and holes.