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. 2018 Aug 7;12(8):8350–8361. doi: 10.1021/acsnano.8b03641

Figure 2.

Figure 2

(a) In/Cu molar ratios of wz CIS QDs in a size range from 2.7 to 6.8 nm. (b) Perspective view of the single CIS QD model (Cu+ or In3+ has the same occupation probability). (c) In/Cu molar ratios of wz CIS QDs obtained from 5.5 nm template Cu2–xS NCs. Ten parallel batches of cation exchange reactions were performed by using different reaction times (20–200 min) and In/Cu feeding ratios (1–5), while keeping all other parameters constant (see SI, Table S2 for details). (d) The first excitonic transition energies of the wz CIS QDs extracted from absorption spectra of the samples mentioned in (c).