Počet záznamů: 1

Surface processes during growth of InAs/GaAs quantum dot structures monitored by reflectance anisotropy spectroscopy

  1. 1.
    0342088 - FZU-D 2011 RIV NL eng J - Článek v odborném periodiku
    Hospodková, Alice - Vyskočil, Jan - Pangrác, Jiří - Oswald, Jiří - Hulicius, Eduard - Kuldová, Karla
    Surface processes during growth of InAs/GaAs quantum dot structures monitored by reflectance anisotropy spectroscopy.
    Surface Science. Roč. 604, 3-4 (2010), 318-321 ISSN 0039-6028
    Grant CEP: GA AV ČR IAA100100719; GA ČR GA202/09/0676
    Výzkumný záměr: CEZ:AV0Z10100521
    Klíčová slova: low-pressure Metal–Organic Vapor Phase * InAs/GaAs quantum dots * reflectance anisotropy spectroscopy Surface reconstruction * surface reconstruction
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 2.010, rok: 2010

    The time resolved reflectance anisotropy spectroscopy (RAS) measurement at 4.2 eV was used for the optimization of technological parameters for Stranski-Krastanow quantum dot (QD) formation. RAS measurement helps us to study the MOVPE surface processes such as QD formation, dissolution of In from InAs QDs during the growth of GaAs capping layer or recovery of epitaxial surface from As deficiency, when As partial pressure is increased. We have shown, that the recovery of epitaxial surface from As deficiency is rather a slow process of the order of tens of seconds. For the first time was observed in situ the mechanism of In atoms migration from QDs during GaAs capping layer growth. First the GaAs layer is formed and then the In migration from QDs follows. These two processes do not start at the same time, the In dissolution is delayed. Conclusions extracted from RAS measurement are in agreement with photoluminescence results.
    Trvalý link: http://hdl.handle.net/11104/0184913