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• W3122171034 abstract "The nanoscale resistive switching characteristics of gallium phosphide (GaP) thin films directly grown on Si are investigated as a function of incident light. Firstly, as-grown GaP films show a high RON/ROFF (~10^4), shown to arise from the formation of conductive channels along the grain boundaries. It is proposed that point defects (most likely Ga interstitials) and structural disorder at the grain boundaries provide the ideal environment to enable the filamentary switching process. Next, we explored if such defects can give rise to mid-gap states, and if so could they be activated by photonic excitation. Both first-principles calculations as well as UV-vis and photoluminescence spectroscopy strongly point to the possibility of mid-gap electronic states in the polycrystalline GaP film. Photoconductive atomic force microscopy (phAFM), a scanning probe technique, is used to image photocurrents generated as a function of incident photon energy (ranging from sub band-gap to above band-gap) on the GaP film surface. We observe photocurrents even for incident photon energies lower than the band-gap, consistent with the presence of mid-gap electronic states. Moreover the photocurrent magnitude is found to be directly proportional to the incident photon energy with a concomitant decrease in the filament resistance. This demonstrates GaP directly integrated on Si can be a promising photonic resistive switching materials system." @default.
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• W3122171034 date "2021-01-16" @default.
• W3122171034 modified "2023-09-27" @default.
• W3122171034 title "Optical Tuning of Resistance Switching in Polycrystalline Gallium Phosphide Thin Films." @default.
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