Bulk Heterojunction Tandem Photoelectric Cell Based on p-Si and Phthalocyanine

An organic-inorganic (p-Si and phthalocyanine) hybrid tandem heterojunction Ag/p-Si/AlPc:H2Pc/ITO photoelectric cell was fabricated by pressing technology using preliminary vapor deposited heterojunction films of mixed aluminum-phthalocyanine (AlPc) and metal free phthalocyanine (H2Pc) on p-Si substrate and on ITO coated plastic substrate. By keeping organic films face to face both substrates were pressed and fixed together by adhesive at elevated temperature. Total thickness of the AlPc and H2Pc films were equal to 300 nm. On the back side of p-Si substrate the Ag film was deposited. The device architecture was the following: Ag/p-Si/AlPc:H2Pc/ITO. The morphology of the organic semiconductors film was investigated by AFM. The optical properties of the AlPc:H2Pc film were studied by UV-visible spectroscope. Current-Voltage characteristics were measured in dark and also illumination conditions. Under illumination of 296 W/m(2) the values of V-oc, I-SC, FF and efficiency were equal to 0.5 V, 4 mA, 0.45 and 0.61 %, respectively. The I-V and P-V characteristics of the solar cell were simulated by using Shockley equation and its Newton Raphson solution, respectively for dark and illumination conditions. The obtained simulated results were in good agreement with the experimental results.