Relaxation of low-temperature negative photoconductivity in p-GaAs/Al0.5Ga0.5As: Be and deep traps near the heterointerfaceстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Relaxation to the dark state of the negative photoconductivity generated in p-GaAs/Al0.5Ga0.5As:Be heterostructures at liquid-helium temperatures under red illumination is investigated. The relaxation is studied at different temperatures in the range where the negative photoconductivity persists (T < 6 K) and under uniaxial compression of up to 1.7 kbar. It is demonstrated that a model assuming the existence of deep donorlike traps with a low thermal activation barrier E(B) = 2.0 ± 0.3 meV near the heterointerface offers a fairly good quantitative description of the relaxation processes.