https://scholars.lib.ntu.edu.tw/handle/123456789/580607
標題: | Biaxial strain effects on photoluminescence of Ge/strained GeSn/Ge quantum well | 作者: | CHEE-WEE LIU Lin C.-Y Ye H.-Y Lu F.-L Lan H.S CHEE-WEE LIU |
關鍵字: | Chemical vapor deposition; Chlorine compounds; Photoluminescence; Semiconductor alloys; Tensile strain; Tin compounds; Biaxial strain effect; Biaxial tensile strain; Empirical pseudopotential method; Photoluminescence measurements; Photoluminescence spectrum; Single quantum well; Theoretical calculations; Type i band alignments; Semiconductor quantum wells | 公開日期: | 2018 | 卷: | 8 | 期: | 9 | 起(迄)頁: | 2795-2802 | 來源出版物: | Optical Materials Express | 摘要: | A Ge/GeSn/Ge single quantum well with 5% Sn content was grown by chemical vapor deposition on a Si substrate using Ge2H6 and SnCl4 precursors. External biaxial tensile strain was mechanically applied to the Ge/Ge0.95Sn0.05/Ge quantum well for the photoluminescence measurement. Note that the Ge0.95Sn0.05 layer is still under compressive strain due to the large internal compressive strain of the GeSn, although the external bending produces the tensile strain. The direct emission of tensily strained Ge buffer shifts toward lower energy, while the direct emission of pseudomorphic Ge0.95Sn0.05 quantum well does not have significant shift. The strain-induced energy changes of heavy holes and light holes in the Γ valley are extracted by fitting the photoluminescence spectra. Based on the nonlocal empirical pseudopotential method and the model-solid theory, a type-I band alignment is used for the fitting of photoluminescence spectra. The experimentally extracted band edge shifts from the photoluminescence measurement have good agreement with theoretical calculation. ? 2018 Optical Society of America. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85052639234&doi=10.1364%2fOME.8.002795&partnerID=40&md5=8d6dee7f0d5217026003de3c324d7e8c https://scholars.lib.ntu.edu.tw/handle/123456789/580607 |
ISSN: | 21593930 | DOI: | 10.1364/OME.8.002795 |
顯示於: | 電機工程學系 |
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