Electrical and photovoltaic properties of photosensitised ITO/a-Si:H p–i–n/TPyP/Au cells

The a-Si:H p–i–n photovoltaic cells photosensitized with an organic layer of 5,10,15,20-tetra (4-pyrydil) 21H,23H porphine (TPyP) have been prepared. The action spectrum of these cells was extended by approximately 30 nm to longer wavelengths, with respect to non-sensitized cells. The presence of the organic layer gives some modifications in the electrical and photovoltaic behavior of the cells, that is why an analysis of dark current–voltage characteristics of the cells at room temperature, is also presented.