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Type: Artigo de periódico
Title: Charge recombination in CuPc/PTCDA thin films
Author: Heutz, S
Nogueira, AF
Durrant, JR
Jones, TS
Abstract: The recombination kinetics of photogenerated charge carriers in perylene-3, 4, 9, 10-tetracarboxylic dianhydride (PTCDA) and copper phthalocyanine (CuPc) thin films grown by organic molecular beam deposition have been studied using transient absorption spectroscopy. Optical excitation is observed to generate long-lived polaron states, which exhibit power law recombination dynamics on time scales from microseconds to milliseconds. Studies as a function of excitation density and temperature, and comparison between heterostructures and PTCDA single layers, all indicate that this power law behavior results from trapping of PTCDA(-) polarons in localized states, with an estimated trap state density of similar to 6 x 10(17) polarons cm(-3). This recombination behavior is found to be remarkably similar to that previously observed for polymer/fullerene blends, suggesting that it may be generic to a range of semiconducting materials.
Country: EUA
Editor: Amer Chemical Soc
Citation: Journal Of Physical Chemistry B. Amer Chemical Soc, v. 109, n. 23, n. 11693, n. 11696, 2005.
Rights: fechado
Identifier DOI: 10.1021/jp0502981
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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