Optical characterisation of Ge islands grown on Si(110)
The growth of Ge islands on Si(110) substrates by low pressure chemical vapour deposition has been studied. Atomic force microscopy images reveal that multifaceted dome shaped islands appear on samples where the two-dimensional (2D) to three-dimensional (3D) growth mode changeover has occurred. Photoluminescence (PL) spectroscopy was used to investigate the growth as a function of the Ge coverage. The excitation power dependence of island PL spectra allowed one to point out a band filling effect and to determine the efficiency of radiative recombinations. In addition, island PL peak evolution with temperature underlined a good hole confinement.
ge islands si(110) low pressure chemical vapour deposition atomic force microscopy photoluminescence