Abstract
Stretched-exponential decay of persistent photoconductivity (PPC) has been observed in Al0.3Ga0.7As in the temperature region T<90 K. The decay time constant and exponent have been measured at different temperatures. Experimental results show that the thermal activated capture of electrons at the DX centers becomes negligible at T<40 K. However, a transition from a thermally activated to a nearly-temperature-independent tunneling capture at a temperature on the order of 40 K has been observed for the first time for Al0.3Ga0.7As, which is consistent with the multiphonon-emission model for DX centers of large lattice relaxation.
Original language | English |
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Pages (from-to) | 5855-5858 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 42 |
Issue number | 9 |
DOIs | |
State | Published - 1990 |