Abstract
The exciton-phonon interaction in a two-dimensional (C 2 H 5 NH 3 ) 2 CdCl 4 single crystal was studied by investigating the low energy tail of the first exciton absorption band in the temperature range of 100–440 K. The tail spectrum for different temperatures obeys the Urbach rule with small steepness parameters. From the analysis of those tails, it is determined that the steepness coefficient σ 0 is 0.60 and the exciton-phonon coupling constant g is 2.1. These indicate that the exciton-phonon interaction in (C 2 H 5 NH 3 ) 2 CdCl 4 is strong and the free exciton relaxes to the self-trapped exciton state. The electronic nature of the excitonic transition is discussed on the basis of the results in the present work.
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