Journal
NANO LETTERS
Volume 15, Issue 1, Pages 75-79Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl502995q
Keywords
Electron beam induced current (EBIC); subsurface imaging; scanning probe microscopy; heterostructured nanowire; core-shell nanowire
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Funding
- National Science Foundation [DMR 0907381, DMR 1124696]
- Nanoscale Research Initiative of the Semiconductor Research Corporation
- US Dept. of Education GAANN-RETAIN program [P200A100117]
- NSF
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1124696] Funding Source: National Science Foundation
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We demonstrate spatial probing of carrier transport within GaAs/AlGaAs coreshell nanowires with nanometer lateral resolution and subsurface sensitivity by energy-variable electron beam induced current imaging. Carrier drift that evolves with applied electric field is distinguished from a coupled drift-diffusion length. Along with simulation of injected electron trajectories, combining beam energy tuning with precise positioning for selective probing of core and shell reveals axial position- and bias-dependent differences in carrier type and transport along parallel conduction channels. These results indicate how analysis of transport within heterostructured nanomaterials is no longer limited to nonlocal or surface measurements.
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