TITLE

Light-induced charge transfer in hybrid composites of organic semiconductors and silicon nanocrystals

AUTHOR(S)
Dietmueller, Roland; Stegner, Andre R.; Lechner, Robert; Niesar, Sabrina; Pereira, Rui N.; Brandt, Martin S.; Ebbers, André; Trocha, Martin; Wiggers, Hartmut; Stutzmann, Martin
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p113301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Charge transfer between silicon nanocrystals (Si-nc) and organic semiconductors has been investigated via light-induced electron spin resonance (LESR). Composites of Si-nc with the hole conductor poly(3-hexylthiophene) (P3HT) and with the electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) have been investigated. The LESR measurements allow one to quantify light-induced charge transfer between Si-nc and P3HT, which results in positive P3HT polarons. PCBM, in contrast, acts as an electron acceptor in composites with Si-nc, and after illumination, negative PCBM radicals are created. These results are discussed in terms of light-induced generation and separation of charge carriers in the hybrid composites.
ACCESSION #
43230405

 

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