Stimulated emission of thin Cu(In,Ga)Se₂ films irradiated by protons

Spontaneous and stimulated emission (SE) of thin Cu(In,Ga)Se₂ films, deposited on sodium-containing glass substrates and irradiated by protons with an energy of 2.5 keV and doses of 10¹⁴—10¹⁷ cm^-2, were investigated upon excitation by nanosecond laser pulses with the power density from 5 to 100 kW/cm². An increase in the intensity and a decrease in the SE threshold appearance were found for the films, irradiated by protons with doses of 10¹⁴—10¹⁵ cm^-2, in comparison with non-irradiated films. An increase in the SE threshold and a decrease in the intensity of SE and spontaneous emission were observed at the irradiation dose of 10¹⁶ cm^-2. After a dose of 10¹⁷ cm^-2 the intensity of emission decreased sharply and the SE threshold was not reached. Possible reasons of the observed effects are discussed.

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