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- W2281990003 abstract "Abstract This study proposes the use of InGaN/GaN superlattices grown beneath InGaN multiple quantum wells (MQWs) and designed with different well widths to act as an electron emitter layer (EEL). Cross-sectional transmission electron microscopy reveals strong indium segregation in the underlying superlattices with a 5-nm-thick In0.1Ga0.9N well, thus corrupting the crystalline perfection of the resulting LEDs, and also increasing their leakage current. It was also found that the depth of the localized states increases with the well width of the underlying superlattices. In the proposed LEDs, variation in the biaxial strains of the superlattice EELs with different well widths results in an increase in indium incorporation of InGaN MQWs, thus obtaining a redshifted photoluminescence emission with respect to that of normal LED. Furthermore, the presence of relatively strong carrier localization and the alleviation of electron leakage from the InGaN MQWs results in improved light output performance from the proposed LEDs grown with a narrow In0.1Ga0.9N well in the underlying superlattices. Although growth in a wide In0.1Ga0.9N well (~3.5 nm) containing underlying superlattices suffers from poor crystalline quality due to partial strain relaxation, it resulted in improved roll-off behavior in terms of light intensity. This may be due to the improved hot electron cooling capacity mitigating the extent of carrier leakage." @default.
- W2281990003 created "2016-06-24" @default.
- W2281990003 creator A5073622193 @default.
- W2281990003 date "2016-06-01" @default.
- W2281990003 modified "2023-09-24" @default.
- W2281990003 title "Effects of underlying InGaN/GaN superlattice structures on the structural and optical properties of InGaN LEDs" @default.
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- W2281990003 doi "https://doi.org/10.1016/j.jlumin.2016.01.033" @default.
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