2013
DOI: 10.1063/1.4830028
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Polarized Raman scattering analysis of Cu2ZnSnSe4 and Cu2ZnGeSe4 single crystals

Abstract: The polarized Raman spectra of the Cu2ZnSnSe4 and Cu2ZnGeSe4 single crystals were measured for various in-plane rotation angles on the basal (1 1 2) crystal facet. The position of up to 15 (for Cu2ZnSnSe4) and 16 (for Cu2ZnGeSe4) Raman peaks was determined in the spectral region 50–300 cm−1. From the analysis of the experimental dependence of the intensity of the Raman peaks with the rotation angle, a symmetry assignment for most of the detected modes and an estimation of numerical values of Raman tensor eleme… Show more

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Cited by 71 publications
(75 citation statements)
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“…The band gap of these compounds is found to increase from ∼1.0 eV for Cu 2 ZnSnSe 4 (CZTSe) 8 to ∼1.4 eV for Cu 2 ZnGeSe 4 , 9,10 and both crystallize in the kesterite-type structure. 11,12 With synthesis of the solid solution CZTGeSe and tuning of the [Sn]/[Ge] ratio, the bandgap energy of the compounds can be varied almost linearly with composition. 10,13 This band-gap variation is expected to occur mainly by changes in the energy position of the conduction band minimum (CBM).…”
Section: Introductionmentioning
confidence: 99%
“…The band gap of these compounds is found to increase from ∼1.0 eV for Cu 2 ZnSnSe 4 (CZTSe) 8 to ∼1.4 eV for Cu 2 ZnGeSe 4 , 9,10 and both crystallize in the kesterite-type structure. 11,12 With synthesis of the solid solution CZTGeSe and tuning of the [Sn]/[Ge] ratio, the bandgap energy of the compounds can be varied almost linearly with composition. 10,13 This band-gap variation is expected to occur mainly by changes in the energy position of the conduction band minimum (CBM).…”
Section: Introductionmentioning
confidence: 99%
“…2 shows a typical Raman spectrum measured on S3 CZTSe sample, together with its fitting with lorentzian curves. All the observed peaks can be interpreted and all Raman active modes can be assigned to those of CZTSe semiconductor 14 and no modes related to possible secondary phases were detected. The low values of the full width on the half maximum ($5 cm À1 for the most of the peaks) support the high crystalline quality of the grown samples observed in the XRD analysis.…”
mentioning
confidence: 99%
“…The position of each Raman peak with the symmetry assignment is presented in Table I, which also contains theoretical calculations 17 and previously reported experimental data. 18 The symmetry assignment of Raman modes was done by comparing the experimentally obtained frequencies with the reported references as well as applying the rules 13 for the mode behavior to polarization measurements preformed on this sample. It can be concluded that peak positions in Table I are in good agreement with the previous work.…”
mentioning
confidence: 99%