Photovoltaic characteristics of Pd doped amorphous carbon film/SiO2/Si

The Pd doped amorphous carbon (a-C:Pd) films were deposited on n-Si substrates with or without a native SiO2 layer using magnetron sputtering. The photovoltaic characteristics of the a-C:Pd/SiO2/Si and a-C:Pd/Si junctions were studied. It is found that under light illumination of 15 mW/cm(2) at room temperature, the a-C:Pd/SiO2/Si solar cell fabricated at 350 degrees C has a high power conversion efficiency of 4.7%, which is much better than the a-C/Si junctions reported before. The enhanced conversion efficiency is ascribed to the Pd doping and the increase in sp(2)-bonded carbon clusters in the carbon film caused by the high temperature deposition. (C) 2010 American Institute of Physics. [doi:10.1063/1.3478230]