| Summary: | We have fabricated infrared active hybrid solar cells composed of mesoporous SnO 2 sensitized with PbS nanoparticles and infiltrated with organic hole-transporters, 2,2',7,7'-tetrakis(N,N-di-p-methoxypheny-amine)-9,9'-spirobifluorene(spiro-OMeTAD) or poly(3-hexylthiophene). We observe photo-action to 1100nm, peak quantum-efficiency over 20%, open-circuit voltages up to 0.5V and power conversion efficiencies of over 0.5% under simulated sun light. As compared to solar cells composed of mesoporous TiO 2 sensitized with the same PbS nanoparticles, the SnO 2 based devices generate 4 times the photocurrent density under simulated sun light. © 2011.
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