Organic semiconductor solar cells with a heterojunction

Solar cells with an SnO2/CuPc/BP/Ag heterojunction are investigated. When the cell was illuminated with white light (E=750 W/m2) through the SnO2, a photoelectric emf of 0.47 V was generated, the short-circuit current was 5 A/m2, and the maximum efficiency for the absorbed light η=0.66%. The barrier capacitance of the heterojunction Cb=1.3·10−3 F/m2; the width of the barrier in the CuPc and BP is W1=7 nm and W2=27 nm, respectively. The photosensitivity range is 400–800 nm. It is concluded that a heterojunction is present at the boundary of the p-CuPc (Eg=2.0 eV) and n-BP (Eg=0.8 eV).