期刊
ACS APPLIED MATERIALS & INTERFACES
卷 2, 期 1, 页码 236-245出版社
AMER CHEMICAL SOC
DOI: 10.1021/am900660n
关键词
exciton generation; exciton diffusion; poly(p-phenylenevinylene); layer-by-layer assembly; organic solar cell
资金
- International Center for Integrated Research and Advanced Education in Materials Science
- Kyoto University
- Hitachi, Ltd.
- Mitsubishi Chemical Corp.
Solution-processed organic thin-him solar cells with triple-layered structures were fabricated by combining a hole-transporting layer made of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS), a light-harvesting layer assembled by layer-by-layer (LbL) deposition of poly(p-phenylenevinylene) (PPV) and PSS, and an electron-transporting layer of fullerene C-60 dispersed in a polystyrene film. The thickness of the light-harvesting layer was precisely designed and controlled on a scale of nanometers by the LbL deposition technique. The efficiency of exciton generation in the PPV/PSS LbL assembly was estimated for various layered structures by optical simulation considering optical interference effects. For the discussion on the efficiency of exciton diffusion, photoluminescence quenching was measured for the LbL assembly with various thicknesses and analyzed using the one-dimensional diffusion model. As a result, the exciton lifetime and diffusion constant were evaluated as 0.67 +/- 0.02 ns and 8 x 10(-4) cm(2) s(-1), respectively. On the basis of these analyses, the photocurrent generation In the solar cells was quantitatively explained in terms of the layered structure.
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