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- W2000515138 abstract "In this work, an atomic force microscope (AFM) with conductive tip was applied to investigate the local photoconductive behavior of lithographically processed GaAs/AlAs heterostructures. Photocurrent images and current vs. voltage (IV) curves were recorded under different tip-sample voltage and tip force conditions. It is found that the AFM tip-sample contact is strongly dependent on the thickness of the native oxide layer on the sample surface. Therefore, the photocurrents increase if a successively increasing tip-sample force is applied, which leads to a gradual penetration of the surface oxide layer. The force dependence of the Schottky barrier height was applied to build a laser free AFM feedback for photocurrent spectroscopy. This feedback system was used to record photocurrent vs. wavelength spectra at a constant tip-sample force." @default.
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- W2000515138 date "2008-03-01" @default.
- W2000515138 modified "2023-10-01" @default.
- W2000515138 title "Force and bias dependent contrast in photocurrent imaging on GaAs–AlAs heterostructures" @default.
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- W2000515138 doi "https://doi.org/10.1016/j.physe.2007.08.086" @default.
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