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 photocapacitive 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 photogenerated electrons and holes.