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- W1965514356 abstract "Charge hopping and percolation in quantum dot (QD) solids has been widely studied, but the microscopic nature of the percolation process is not understood or determined. Here we present the first imaging of the charge percolation pathways in two-dimensional PbS QD arrays using Kelvin probe force microscopy (KPFM). We show that under dark conditions electrons percolate via in-gap states (IGS) instead of the conduction band, while holes percolate via valence band states. This novel transport behavior is explained by the electronic structure and energy level alignment of the individual QDs, which was measured by scanning tunneling spectroscopy (STS). Chemical treatments with hydrazine can remove the IGS, resulting in an intrinsic defect-free semiconductor, as revealed by STS and surface potential spectroscopy. The control over IGS can guide the design of novel electronic devices with impurity conduction, and photodiodes with controlled doping." @default.
- W1965514356 created "2016-06-24" @default.
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- W1965514356 date "2015-04-09" @default.
- W1965514356 modified "2023-09-27" @default.
- W1965514356 title "Charge Percolation Pathways Guided by Defects in Quantum Dot Solids" @default.
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- W1965514356 doi "https://doi.org/10.1021/acs.nanolett.5b00454" @default.
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