Xd. Wang et al., Effect of InxGa1-xAs (0 <= x <= 0.4) capping layer on self-assembled 1.3 mu m wavelength InAs/GaAs quantum islands, J CRYST GR, 223(3), 2001, pp. 363-368
We report the effect of InchiGa1-chiAs (0 less than or equal to chi less th
an or equal to0.4) capping layer on photoluminescence (PL) properties of 1.
3 mum wavelength self-assembled InAs quantum islands, which are formed via
depositing 3.5 monolayers (ML) InAs on GaAs (1 0 0) substrate by molecular
beam epitaxy (MBE). Compared with the InchiGa1-chiAs capping layer containi
ng a larger In mole fraction chi greater than or equal to0.2 and the GaAs c
apping layer (chi = 0), the InAs islands covered by the In0.1Ga0.9As layer
show PL with lower emission energy, narrower full-width at half-maximum (FW
HM), and quite stronger intensity. The PL peak energy and FWHM become more
temperature dependent with the increase of In content in the InchiGa1-chiAs
capping layer (chi greater than or equal to0.2), while the InAs islands co
vered by the In0.1Ga0.9As layer is much less temperature sensitive. In addi
tion, the InAs islands covered by the In0.1Ga0.9As capping layer show room
temperature PL wavelength at about 1.3 mum. (C) 2001 Published by Elsevier
Science B.V.