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