Author/Authors :
M.D Efremov، نويسنده , , V.A. Volodin، نويسنده , , V.A Sachkov، نويسنده , , V.V Preobrazhenskii، نويسنده , , B.R Semyagin، نويسنده , , D.V Marin، نويسنده , , R.S Matvienko، نويسنده , , N.N. Ledentsov 1، نويسنده , , I.P Soshnikov، نويسنده , , D Litvinov، نويسنده , , A Rosenauer، نويسنده , , D Gerthsen، نويسنده ,
Abstract :
(3 1 1)A GaAs/AlAs corrugated superlattices (CSLs) and satellite (3 1 1)B and (1 0 0) SLs were studied using Raman spectroscopy, high-resolution transmittance electron microscopy (HRTEM) and photoluminescence (PL). The thickness of GaAs layers was varied from View the MathML source (ML) to View the MathML source, the thickness of AlAs barriers was View the MathML source in (3 1 1) direction. The strongest modification of the Raman spectra is found for the case of partial View the MathML source GaAs filling of the AlAs surface. The calculated and experimental Raman spectra demonstrated a good agreement for both complete View the MathML source and partial View the MathML source GaAs filling of the AlAs surface. According to Raman and HRTEM data, in the case of partial filling of (3 1 1)A AlAs surface, GaAs forms quantum well wires of finite length (quantum dots). A drastic difference of PL from grown side-by-side (3 1 1)A and (3 1 1)B SLs was observed. A strong room temperature PL in the green–yellow spectral region was observed in GaAs/AlAs (3 1 1)A CSLs containing GaAs type-II quantum dots.
