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. 2015 Apr 24;5:9945. doi: 10.1038/srep09945

Table 1. Relative atomic percentage of elements in ligand-exchanged QD films determined by XPS.

Treatment C N I Cl Pb S O Cd Pb:S Pb:I Pb:Cl (Pb+Cd):(S+I+Cl)
PbI2 2.5 * 26.9 * 45.7 19.3 5.3 0.3 2.1 2.1   1.0
TBAI 26.7 1.3 19.2 * 34.3 16.4 1.7 0.4 2.1 1.8   1.0
MPA 27.3 * * 7.0 28.4 19.7 16.6 1.0 1.4   4.1 1.1
NH4SCN 21.0 2.9 * 4.0 37.8 27.3 7.0 0.2 1.4   9.5 1.2

*values below detection limit