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• W2517173245 abstract "We have studied the effect of continuous illumination with above band gap energy on the emission intensity of polar (Al)GaN bulk layers during the photoluminescence experiments. A temporal change in emission intensity on time scales from seconds to hours is based on the modification of the semiconductor surface states and the surface recombination by the incident light. The temporal behavior of the photoluminescence intensity varies with the parameters such as ambient atmosphere, pretreatment of the surface, doping density, threading dislocation density, excitation power density, and sample temperature. By means of temperature-dependent photoluminescence measurements, we observed that at least two different processes at the semiconductor surface affect the non-radiative surface recombination during illumination. The first process leads to an irreversible decrease in photoluminescence intensity and is dominant around room temperature, and the second process leads to a delayed increase in intensity and becomes dominant around T = 150–200 K. Both processes become slower when the sample temperature decreases from room temperature. They cease for T &lt; 150 K. Stable photoluminescence intensity at arbitrary sample temperature was obtained by passivating the analyzed layer with an epitaxially grown AlN cap layer." @default.
• W2517173245 created "2016-09-16" @default.
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• W2517173245 date "2016-09-07" @default.
• W2517173245 modified "2023-09-27" @default.
• W2517173245 title "Temperature and doping dependent changes in surface recombination during UV illumination of (Al)GaN bulk layers" @default.
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• W2517173245 doi "https://doi.org/10.1063/1.4962319" @default.
• W2517173245 hasPublicationYear "2016" @default.
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