Tandem Heterojunction Photoelectric Cell Based on Organic-Inorganic Hybrid of AlPc-H2Pc and n-Si

The tandem heterojunction photoelectric cell has been fabricated on the basis of organic-inorganic hybrid of AlPc-H2Pc (aluminium phthalocyanine-metal free phthalocyanine) and n-Si using pressing technique along with vapor deposition. Initially, the AlPc-H2Pc heterojunction films of thickness 150 nm were deposited on the ITO coated glass and the n-Si substrates as well by vapor deposition. Both the substrates (ITO glass and n-Si) were pressed and fixed together by keeping the deposited heterojunction films face to face. The pressing was done at elevated temperature (60-80 degrees C), while fixing was carried out by using adhesive. A 100 nm thick silver (Ag) film was deposited on the back of n-Si substrate. The complete architecture of the device was as ITO/AlPc:H2Pc/n-Si/Ag. The AFM and UV-visible spectroscopy were used to investigate the morphology and optical properties of the organic (AlPc-H2Pc) films, respectively. The cell was characterized for current-voltage behavior in dark and also under illumination. The values of I-SC, V-oc, fill factor (FF) and efficiency under illumination of 290 W/m(2) were equal to 0.7 V, 2.17 mA/cm(2), 0.33 and 1.1%, respectively.