Studies of Ag photodoping in glassyGexSe1−xfilms by electron-energy-loss spectroscopy

We have studied both the single-particle and collective electronic excitations in pure and Ag-photodoped ${\mathrm{Ge}}_x{\mathrm{Se}}_{1-x}$ glassy films by high-energy transmission electron-energy-loss spectroscopy. Changes of electronic structures as a result of Ag photodoping are observed. The most prominent changes are exhibited in the form of changing interband-transition structures, broadening of the collective plasmon peak, and shifting of Se core edges.