The onset time of photocrystallization (PC) as a function of temperature in films designed for avalanche photodetectors is explored using Raman scattering experiments. The PC onset time is compared to the time-constant for irreversible photodarkening (IPD) studied in earlier work. Both and exhibit activated thermal behavior mediated by an energy barrier . We suggest that the formation kinetics of PC and IPD in are governed by the same energy surface and configuration changes, occurring via photoinduced defects during the primary stage of crystallization.
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2008
American Institute of Physics
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