Effect of extended defects on photoluminescence of gallium oxide and aluminum gallium oxide epitaxial films

被引：25
|
作者：
Cooke, Jacqueline [1 ]
Ranga, Praneeth [1 ]
Jesenovec, Jani [4 ,5 ]
McCloy, John S. [4 ,5 ]
Krishnamoorthy, Sriram [3 ]
Scarpulla, Michael A. [1 ,2 ]
Sensale-Rodriguez, Berardi [1 ]
机构：
[1] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA
[2] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA
[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
[4] Washington State Univ, Inst Mat Res, Pullman, WA 99164 USA
[5] Washington State Univ, Mat Sci & Engn Program, Pullman, WA 99164 USA
来源：
SCIENTIFIC REPORTS | 2022年 / 12卷 / 01期
关键词：
DOPED BETA-GA2O3 LAYERS; THIN-FILMS; GROWTH; LUMINESCENCE; TRANSPARENT;
D O I：
10.1038/s41598-022-07242-z
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
In this work, a systematic photoluminescence (PL) study on three series of gallium oxide/aluminum gallium oxide films and bulk single crystals is performed including comparing doping, epitaxial substrates, and aluminum concentration. It is observed that blue/green emission intensity strongly correlates with extended structural defects rather than the point defects frequently assumed. Bulk crystals or Si-doped films homoepitaxially grown on (010) beta-Ga2O3 yield an intense dominant UV emission, while samples with extended structural defects, such as gallium oxide films grown on either (-201) beta-Ga2O3 or sapphire, as well as thick aluminum gallium oxide films grown on either (010) beta-Ga2O3 or sapphire, all show a very broad PL spectrum with intense dominant blue/green emission. PL differences between samples and the possible causes of these differences are analyzed. This work expands previous reports that have so far attributed blue and green emissions to point defects and shows that in the case of thin films, extended defects might have a prominent role in emission properties.
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页数：10
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