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- W2562943061 abstract "Abstract Here we present the observation of a unique phenomenon of converting electrical conductivity types in surface atomic-ligand exchanged of PbS quantum dots (QDs), while tuning the gate voltage of PbS QD-based thin film field-effect transistors (TFTs). The synthesized PbS-QD thin films showed different conductivity (n- or p-) types depending on the direction of gate voltage sweeping. When increasing gate voltage from negative to positive voltage, the TFT devices produced n-channel characteristics with a typical mobility on the order of μ n = 10 −1 cm 2 V −1 s −1 . By contrast, the devices showed p-channel characteristics with similar mobility when sweeping the gate voltage from positive to negative. The studies based on density functional theory (DFT) theoretical calculations and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the band gap of ligand exchanged PbS-QDs changes upon gate voltage sweeping, affecting the surface states of the QDs due to the adhered Br − and therefore altering the conductivity type of the materials. These findings signify the carrier type switching behavior via gate voltage tuning in atomic-ligand exchange QD thin films, suggesting great application potential of QD for advanced new-generation nano-electronic devices." @default.
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- W2562943061 date "2017-03-01" @default.
- W2562943061 modified "2023-10-17" @default.
- W2562943061 title "Converting electrical conductivity types in surface atomic-ligand exchanged PbS quantum dots via gate voltage tuning" @default.
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- W2562943061 doi "https://doi.org/10.1016/j.jallcom.2016.12.389" @default.
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