真空科学与技术学报
真空科學與技術學報
진공과학여기술학보
JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY
2001年
2期
125-128
,共4页
祝传刚%徐彭寿%李伟刚%郭红志%陆尔东%徐发强%潘海斌
祝傳剛%徐彭壽%李偉剛%郭紅誌%陸爾東%徐髮彊%潘海斌
축전강%서팽수%리위강%곽홍지%륙이동%서발강%반해빈
界面%半导体%同步辐射
界麵%半導體%同步輻射
계면%반도체%동보복사
利用同步辐射光电子能谱技术详细研究了Fe/GaAs(100)的界面反应和电子结构。在界面处,Fe与As形成稳定的化学键,而Ga则溶解到Fe薄膜中形成合金,但反应只能在界面处发生,形成窄的反应层。Fe沉积后改变了GaAs表面的电子结构,重新钉扎了费米能级位置,引起费米能级向价带顶移动0.27 eV。另外,Fe的生长模式在沉积过程中发生改变,而且存在As和Ga的扩散现象,同步辐射价带谱也证实了这一点。
利用同步輻射光電子能譜技術詳細研究瞭Fe/GaAs(100)的界麵反應和電子結構。在界麵處,Fe與As形成穩定的化學鍵,而Ga則溶解到Fe薄膜中形成閤金,但反應隻能在界麵處髮生,形成窄的反應層。Fe沉積後改變瞭GaAs錶麵的電子結構,重新釘扎瞭費米能級位置,引起費米能級嚮價帶頂移動0.27 eV。另外,Fe的生長模式在沉積過程中髮生改變,而且存在As和Ga的擴散現象,同步輻射價帶譜也證實瞭這一點。
이용동보복사광전자능보기술상세연구료Fe/GaAs(100)적계면반응화전자결구。재계면처,Fe여As형성은정적화학건,이Ga칙용해도Fe박막중형성합금,단반응지능재계면처발생,형성착적반응층。Fe침적후개변료GaAs표면적전자결구,중신정찰료비미능급위치,인기비미능급향개대정이동0.27 eV。령외,Fe적생장모식재침적과정중발생개변,이차존재As화Ga적확산현상,동보복사개대보야증실료저일점。
Interface reactions and the electronic structures at Fe/GaAs(100) interface were studied by synchrotron radiation photo-emission.We found that Ga diffuses into Fe film to form some kind of alloy and that Fe and As atoms form stable chemical bond.The reaction takes place only at the interface,resulting in the formation of a narrow interface layer.Fe deposition alters the surface electronic structures of GaAs,re-pinning the Fermi level,which shifts 0.27 eV downwards to the valence band.Fe growth mode varies in Fe deposition;diffusion of Ga and As was also observed. These observations were confirmed by the valence band spectra of synchrotron radiation photo-emission.