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 SM ISO690:2012BOGDANOV, E., ILIEVSKY, A., KRAAK, W., MININA, N.. Photoconductivity in p-GaAs/Al0.5Ga0.5As and deep donor like states at heterointerface. In: Moldavian Journal of the Physical Sciences, 2005, nr. 4(4), pp. 459-463. ISSN 1810-648X. |
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| Moldavian Journal of the Physical Sciences | ||||||
| Numărul 4(4) / 2005 / ISSN 1810-648X /ISSNe 2537-6365 | ||||||
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| Pag. 459-463 | ||||||
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Thermoactivated negative photoconductivity has been observed and investigated in
p-GaAs/Al0.5Ga0.5As heterostructures under illumination with the red light in the temperature
interval 1.5 – 20 K. Uniaxial compression up to 4.4 kbar was used as an additional parameter
changing the energy spectrum of 2D holes. Temperature dependences of the 2D hole
concentration and mobility in the thermoactivated photoconductivity state can be described by
a model with deep donor like traps in the vicinity of the heterointerface below the Fermi level,
if a barrier EB = 6 meV between the ground and excited states is introduced. These traps are
supposed to be in the spacer at the distance 7 – 48 nm from the heterointerface.
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