Photocurrent Spectra and Fast Kinetic Studies of P3HT/PCBM Mixed with a Dye for Photoconversion in the Near-IR Region
作者： Erik M. J. Johansson , Arkady Yartsev , Håkan Rensmo , Villy Sundström
DOI: 10.1021/JP808610F
关键词:
摘要: Photoconversion properties are demonstrated for a device based on small dye molecule, absorbing light in the near-IR region, mixed with two organic charge transport materials and together forming dye-sensitized bulk heterojunction. The phthalocyanine (1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine), blend of poly(3-hexylthiophene) (P3HT) 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C-61 (PCBM), shows photoconversion spectrum extended more than 150 nm toward longer wavelengths, as compared to without such sensitization. In region maximum infernal quantum efficiency was estimated 40%. With higher concentrations internal decreases. Transient laser spectroscopy measurements show that after excitation there is an electron transfer from PCBM subsequent hole P3HT, which results long-lived (P3HT(+)/dye/PCBM-) charge-separated state.
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