Abstract
The simple bilayer solar cells, composed of poly (3-hexylthiophene-2,5-diyl) (P3HT) and chromium doped titanium dioxide (Cr–TiO2) nanocrystal films, were fabricated by sol–gel method. The performances of structurally identical polymer–inorganic heterojunction solar cells Cu/Cr–TiO2/P3HT/FTO/Glass with various Cr3+ doping concentration were systematically investigated and compared. The results indicate that the samples’ open-circuit voltage is remarkably enhanced from 0.42V to 0.99V, and short-circuit photocurrent increases at first and then reduces, with the increase of Cr3+ doping concentration. The enhancement mechanism of photovoltaic properties is discussed in detail.
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