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- W2397474795 abstract "A fast and non-destructive method for probing the true signatures of 2D electron gas (2DEG) states in AlGaN/GaN heterostructures is presented. Two broad features superimposed with interference oscillations are observed in the low temperature photoluminescence (PL) spectrum. The two features are identified as the ground and excited 2DEG states which are confirmed by comparing the PL spectra of as-grown and top barrier layer etched samples. Broad PL features disappear at a certain temperature along with the associated interference oscillations. Furthermore, the two broad PL features depicts specific temperature and excitation intensity dependencies which make them easily distinguishable from the bandedge excitonic or defect related PL features. The presence of strong interference oscillations associated with the 2DEG PL features is explained by considering the localized generation of PL signal at the AlGaN/GaN heterointerface. Finally, a large value of the polarization induced electric field of ~1.01 MV cm−1 is reported from PL measurements for AlGaN/GaN HEMT structures. It became possible only when the true identification of 2DEG features was made possible by the proposed method." @default.
- W2397474795 created "2016-06-24" @default.
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- W2397474795 date "2016-05-26" @default.
- W2397474795 modified "2023-10-14" @default.
- W2397474795 title "An unambiguous identification of 2D electron gas features in the photoluminescence spectrum of AlGaN/GaN heterostructures" @default.
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- W2397474795 doi "https://doi.org/10.1088/0022-3727/49/26/265107" @default.
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