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Chemical Visualization of a GaN p-n junction by XPS

Scientific Reports, ISSN: 2045-2322, Vol: 5, Issue: 1, Page: 14091
2015
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Article Description

We report on an operando XPS investigation of a GaN diode, by recording the Ga2p 3/2 peak position under both forward and reverse bias. Areal maps of the peak positions under reverse bias are completely decoupled with respect to doped regions and allow a novel chemical visualization of the p-n junction in a 2-D fashion. Other electrical properties of the device, such as leakage current, resistivity of the domains are also tapped via recording line-scan spectra. Application of a triangular voltage excitation enables probing photoresponse of the device.

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