Abstract
UV absorption spectra near the fundamental edge of the amorphized mixed system of PbCl 2(1-x) Br 2x are measured and analyzed in the full range of x, to investigate effects of chemical disorder on localized states. By amorphization, all the extended states contributing to excitonic absorption are localized giving rise to a Gaussian absorption band. Its linewidth depends on x and has a maximum at x = 0.5 due to maximal chemical disorder despite the stoichiometric composition (PbClBr). The mixing-enhanced disorder reduces the oscillator strength for the Gaussian band, suggesting a decreased singlet component in the localized excited state.
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