Subsurface Imaging of Coupled Carrier Transport in GaAs/AlGaAs Core–Shell Nanowires
We demonstrate spatial probing of carrier transport within GaAs/AlGaAs core–shell 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 dr...
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Published in: | Nano letters 2015-01, Vol.15 (1), p.75-79 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We demonstrate spatial probing of carrier transport within GaAs/AlGaAs core–shell 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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ISSN: | 1530-6984 1530-6992 |
DOI: | 10.1021/nl502995q |