Počet záznamů: 1  

Comparison of MOVPE grown GaAs, InGaAs and GaAsSb covering layers for different InAs/GaAs quantum dot applications

  1. 1.
    0474047 - FZU-D 2018 RIV NL eng J - Článek v odborném periodiku
    Zíková, Markéta - Hospodková, Alice - Pangrác, Jiří - Oswald, Jiří - Hulicius, Eduard
    Comparison of MOVPE grown GaAs, InGaAs and GaAsSb covering layers for different InAs/GaAs quantum dot applications.
    Journal of Crystal Growth. Roč. 464, Apr (2017), s. 59-63. ISSN 0022-0248
    Grant CEP: GA MŠk LO1603
    Institucionální podpora: RVO:68378271
    Klíčová slova: MOVPE * quantum dot * strain reducing layer * InAs * GaAsSb * InGaAs
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
    Impakt faktor: 1.742, rok: 2017

    InAs/GaAs QD HS with different covering layers (CLs) prepared by MOVPE are compared. The recombination energy of a structure covered only by GaAs depends nonlinearly on CL thickness. Experimental data of PL were supported by theoretical simulations. These simulations prove that the strain plays a major role. Due to the strain reduction, the recombination energy is decreased, so the structure has longer PL wavelength. By theoretical simulations it was shown that for high content of In in InGaAs covering layer (45% and more), the heterostructure is type II, which would normally be unreachable for flat layers. For the structure with GaAsSb SRL, the band alignment is highly dependent on the SRL composition. The type I/type II transition occurs for approximately 15% of Sb, this value also slightly depends on the QD size. All structures were also studied by HRTEM to show different behavior of the CLs on the interface with InAs which highly influences the structure quality.
    Trvalý link: http://hdl.handle.net/11104/0271146