期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 14, 期 41, 页码 14196-14201出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp41359k
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资金
- Dutch Polymer Institute [518]
- NSF-SOLAR
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1035480] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0843934] Funding Source: National Science Foundation
We show that the method we have developed for measuring the singlet exciton diffusion length in blends with [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) can be applied not only to polymeric materials, but also to small molecule organic semiconductors. Small organic molecules have a large potential for molecular re-organization upon thermal annealing. Here we show that the exciton diffusion length is decreased upon annealing from 9 to 3 nm in a thin film of a diketopyrrolopyrrole derivative. Such a variation is attributed to exciton delocalization effects in the crystalline domains that are formed during the annealing process as well as to the exciton quenching at grain boundaries.
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