Nondispersive hole transport in carbazole- and anthracene-containing polyspirobifluorene copolymers studied by the charge-generation layer time-of-flight technique

Laquai, Frédéric; Wegner, Gerhard; Im, Chan; Bässler, Heinz; Heun, Susanne

doi:doi:10.1063/1.2168590

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Comparison of blended versus layered structures for poly(p-phenylene vinylene)-based polymer photovoltaics

We characterize and compare blended and bilayered heterojunctions of polymer photovoltaic devices using poly[oxa-1,4-phenylene-1,2-(1-cyano)-ethenylene-2,5-dioctyloxy-1,4-phenylene-1,2-(2-cyano)-ethenylene-1,4-phenylene] (CN-ether-PPV) and poly[2,5-dimethoxy-1,4-phenylene-1,2-ethenylene-2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene-1,2-ethenylene] (M3EH-PPV) as electron- and hole-transporting polymers, respectively. We find that both blended and bilayered structures have substantially improved cu...

Electronic properties of H-terminated diamond in electrolyte solutions

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Nondispersive hole transport in two polyspirobifluorene copolymers containing either 10% anthracene or 10% carbazole was studied in detail by the charge-generation layer time-of-flight (TOF) technique over a wide range of electric fields and temperatures. The TOF transients of both polymers showed a clear plateau indicating nondispersive transport of charge carriers. Zero-field mobilities were found to be in the order of 10⁻⁶ cm²/V s at room temperature. Results were analyzed within the framework of the Gaussian disorder model to extract the parameters of the charge-carrier transport. The width of the transport density of states was determined to be 83 meV for the polyspirobifluorene-anthracene copolymer and 89 meV for the polyspirobifluorene-carbazole copolymer. At lower temperatures a change of slope in the temperature dependence of the zero-field mobility was observed. At higher temperatures the TOF transients were modified by a cusp. Both phenomena can be explained within the framework of the Gaussian disorder model.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
CONCLUSIONS

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KEYWORDS and PACS

Keywords

hole mobility, polymer blends, time of flight spectra

PACS

72.20.Fr

Low-field transport and mobility; piezoresistance
71.20.Rv

Polymers and organic compounds

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http://dx.doi.org/10.1063/1.2168590

PUBLICATION DATA

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0021-8979 (print)

1089-7550 (online)

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American Institute of Physics

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