Slow relaxation of an excited state of an arsenic donor impurity in germanium
Pokrovskii Ya. E. , Smirnova O. I. , Khval'kovskii N. A.
There are long-lived excited impurity states in germanium, as in diamond and silicon. In the case of an arsenic donor impurity, a long-lived excited state is manifested in a slow (3X 10"5 s) relaxation of the impurity photoconductivity when a microwave bias voltage is applied. © 1995 American Institute of Physics.