Figure 4.

(a) Sizing curve of colloidal wz CIS QDs (In/Cu = 0.91 ± 0.11). The solid line is a fit based on a theoretical expression (eq 2) and is described by eq 3. (b) Sizing curve of colloidal cp CIS QDs. The symbols represent experimental data collected from previous reports.^{51,52,54−57} The In/Cu ratio of most samples is 1.0 ± 0.1 (see Supporting Information, Table S3, for the reported composition of all samples). The composition of the CIS QDs studied by Zhong etal.⁵⁵ and Li etal.⁵⁷ were reported to be size-dependent (In/Cu = 0.42 to 0.88 in the 3.6 to 7.6 nm size range⁵⁵ and 1.04 to 0.93 in the 2.2 to 3.3 nm size range,⁵⁷ respectively). The purple dashed line represents a calculation based on a finite depth-well effective mass approximation model.⁵⁵ The orange solid line is a fit based on a theoretical expression (eq 2) and is described by eq 4. The green data points circled by the dashed ellipsoidal line are derived from an empirical polynomial function reported by Booth etal. using their data⁵² and was not included in the fit (see text for further details). For convenience, sizing curves correlating the QD diameter with the wavelength of the first absorption peak are provided in the Supporting Information (Figure S9).