Table 1 Relative concentration calculated from integrated peak intensity ratios extracted from XPS data.

Sample Te3d 5/2 TeO2/CdTe1 Te3d 5/2/Cd3d 5/2 Cd3d 5/2/S2p2 Te3d 5/2/S2p QY (%)
CdTe/TGA 0.21 0.34 1.58 0.55 23.4 ± 0.8
CdTe/MPA 0.84 0.61 1.69 1.03 18.0 ± 0.4
CdTe/MES 1.46 0.60 0.53 0.32 12.0 ± 0.4
CdTe/MPS 1.57 0.72 1.28 0.92 1.6 ± 0.1
1. 1TeO2/CdTe refers to ratio of bands related to TeO2 (Te4+ binding to O) and CdTe (Te2− binding to Cd2+); 2SO32− peaks were not taken into account.