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Measuring Reduced C 60 Diffusion in Crosslinked Polymer Films by Optical Spectroscopy
Author(s) -
Fischer Florian,
Hahn Tobias,
Bässler Heinz,
Bauer Irene,
Strohriegl Peter,
Köhler Anna
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201401153
Subject(s) - polyfluorene , materials science , diffusion , polymer , photoluminescence , quenching (fluorescence) , organic semiconductor , spectroscopy , fullerene , organic solar cell , semiconductor , molecule , analytical chemistry (journal) , chemical engineering , chemical physics , nanotechnology , optoelectronics , fluorescence , optics , organic chemistry , composite material , copolymer , thermodynamics , chemistry , physics , quantum mechanics , engineering
The diffusion of fullerenes such as C 60 and PCBM in organic semiconductors is a key factor in controlling the efficiency of organic solar cells, though it is challenging to measure and to control. A simple optical method based on photoluminescence quenching is developed to assess the diffusion of a quencher molecule such as C 60 through a semiconducting polymer film, in this case made with the polymer polyfluorene. When the mobility of the polymer chains is reduced by chemical crosslinking, the diffusion coefficient of C 60 can be reduced by up to three orders of magnitude.