The long-term relaxation and build-up transient of photoconductivity in Si1-xGex/Si quantum wells

Abstract
The long-term relaxation and build-up transient of photoconductivity has been observed in Si1-xGex/Si quantum wells. The long-term relaxation behaviour of photoconductivity can be described by a stretched-exponential function, Ipc(t)=Ipc(0) exp(=(t/ tau )beta )(0< beta 1-xGex/Si quantum wells.