Abstract
To experimentally identify the character of radiative transitions in trigonal Cu2BaSnS4, we conduct temperature and excitation intensity dependent photoluminescence (PL) measurements in the temperature range of 15–300 K. The low-temperature near band edge PL spectrum is interpreted as the free exciton at 2.11 eV and the bound exciton at 2.08 eV, coupled with associated phonon-assisted transitions. In the low energy region, we assign the dominant defect emission at 1.96 eV to donor–acceptor-pair recombination and the weak broad emission at 1.6 eV to the free-to-bound transition. The activation energies and temperature shift for the radiative transitions are determined and discussed. Above 90 K, the free exciton recombination becomes the dominant radiative transition, with its energy shift mainly governed by the contribution of optical phonons.
Highlights
Scitation.org/journal/apm differences were noted in the photoluminescence properties between the samples with and without NaCl added to the solution
Temperature may alter the energy of exciton transitions, but it has a negligible effect on the current transitions at least up to 80 K and cannot account for the observed differences between our results and those reported in Ref. 9
A closer inspection of the PL spectrum at 15 K reveals that the near band edge PL exhibits several additional weak transitions labeled by arrows in Fig. 1(a): at 2.046 and 2.055 eV on the high energy side of the 1.96 eV defect PL band and at 2.07 eV on the low energy side of the BE emission
Summary
Scitation.org/journal/apm differences were noted in the photoluminescence properties between the samples with and without NaCl added to the solution.
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