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- W2809312830 abstract "In semiconductors, increasing mobility with decreasing temperature is a signature of charge carrier transport through delocalized bands. Here, we show that this behavior can also occur in nanocrystal solids due to temperature-dependent structural transformations. Using a combination of broadband infrared transient absorption spectroscopy and numerical modeling, we investigate the temperature-dependent charge transport properties of well-ordered PbS quantum dot (QD) solids. Contrary to expectations, we observe that the QD-to-QD charge tunneling rate increases with decreasing temperature, while simultaneously exhibiting thermally activated nearest-neighbor hopping behavior. Using synchrotron grazing-incidence small-angle X-ray scattering, we show that this trend is driven by a temperature-dependent reduction in nearest-neighbor separation that is quantitatively consistent with the measured tunneling rate." @default.
- W2809312830 created "2018-06-29" @default.
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- W2809312830 date "2018-06-21" @default.
- W2809312830 modified "2023-10-02" @default.
- W2809312830 title "Inverse Temperature Dependence of Charge Carrier Hopping in Quantum Dot Solids" @default.
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- W2809312830 doi "https://doi.org/10.1021/acsnano.8b01643" @default.
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