Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-07-12
APL 91, 142120 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The values of binding energy changed from previous versions because of a better understanding for the dielectric permittivity.
Scientific paper
10.1063/1.2794012
A doping series of AlAs (001) quantum wells with Si delta-modulation doping on both sides reveals different dark and post-illumination saturation densities, as well as temperature dependent photoconductivity. The lower dark two-dimensional electron density saturation is explained assuming deep binding energy of Delta_DK = 65.2 meV for Si-donors in the dark. Persistent photoconductivity (PPC) is observed upon illumination, with higher saturation density indicating shallow post-illumination donor binding energy. The photoconductivity is thermally activated, with 4 K illumination requiring post-illumination annealing to T = 30 K to saturate the PPC. Dark and post-illumination doping efficiencies are reported.
Abstreiter Gerhard
Bichler Martin
Dasgupta Subhajit
Grayson Matt
Knaak C.
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