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Detecting ZnSe secondary phase in Cu2ZnSnSe4 by room temperature photoluminescence
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Image of FIG. 1.
FIG. 1.

(a) Ternary phase diagram showing composition of samples A(x) and B(+) (adapted from Ref. ). (b) Normalized Raman spectra of sample A taken at 514.5 nm (shown in green; average spectrum of a 15 m line scan) and 457.9 nm (shown in blue; single point measurement) excitation wavelengths. Reference peak positions for CZTSe (blue; see Ref. ) and ZnSe (orange; see Ref. ) are also included.

Image of FIG. 2.
FIG. 2.

Spectra of PL (514.5 nm excitation wavelength) ((a) and (b): different spectral ranges) and Raman (457.9 nm excitation wavelength) ((c) normalized to the reflected laser beam, (d) normalized to the main peak) from two representative points on sample A taken at room temperature. Insets show 80 × 80 m maps of spectrally integrated signals of the following energy ranges: (a) 1.0–1.6 eV (ZnSe), (b) 0.77–1.05 eV (CZTSe), (c) 230–260 cm(ZnSe—shown in gray), and (d) 160–175 cm (CZTSe—shown in gray). The intensities are given in arbitrary units with increasing intensity from blue over yellow to red. The contour from the inset of Figure 2(a) is plotted in the insets of Figures 2(b) to 2(d) as a guide to the eye.

Image of FIG. 3.
FIG. 3.

Micro RT-PL spectrum taken on sample B (black). A fit of the luminescence attributed to Zn Se is shown in red. The rest spectrum, i.e., the signal related to CZTSe is shown in blue.

Image of FIG. 4.
FIG. 4.

Normalized micro Raman measurements taken at the same depth of sample B at different excitation wavelengths (green for 514.5 nm excitation, blue for 457.9 nm excitation). ZnSe (red) and CZTSe (black) peak positions are marked.

Image of FIG. 5.
FIG. 5.

Evolution PL (black) and Raman (blue) signal intensities as a function of depth. For the Raman peak intensity, the ratio of the intensities (I(250 cm)–I(235 cm))/I(235 cm) is plotted.


Generic image for table
Table I.

PCC (see Ref. ) for the integrated signals shown in the insets of Figure 2 .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Detecting ZnSe secondary phase in Cu2ZnSnSe4 by room temperature photoluminescence