Fig. 2: Formation of a Cd(O,S,Se,Te) region in Cd(Se,Te) solar cells.

a, d Cross-sectional HAADF-STEM images; (b, e) overlaid EDS mappings for (green) Te, (blue) Se, and (red) S; (c, f) elemental line profiles extracted from the EDS maps for the devices with CdSe and Cd(O,Se).