期刊
NANO LETTERS
卷 9, 期 11, 页码 3848-3852出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl902062x
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资金
- National Science Foundation (NSF) [DMR-0819885]
- University of Minnesota (UMN)
- NSF
Efficient transport of both electrons and holes with high carrier densities is a requirement for obtaining light-emitting transistors from films of colloidal semiconductor nanocrystals. Such devices offer an approach to efficient electrically pumped nanocrystal lasers with tunable emission. Here, we report a low-voltage ambipolar thin-film transistor that features high carrier mobility and high induced carrier density by combining a PbSe nanocrystal film with a high-capacitance ion-gel gate dielectric layer (similar to 22 and similar to 9 mu F/cm(2) for electron and hole accumulation, respectively). At operation voltages below 2.5 V, electron and hole densities higher than similar to 10(14) carriers/cm(2) could be achieved in the PbSe nanocrystal film, which corresponds to similar to 3 electrons or holes per particle. Carrier mobilities were also dependent on charge density and were as high as 0.4 and 0.02 cm(2)/(V s) for electrons and holes, respectively.
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