Table 1. Cu/In Ratios of CIS NCs after Different Washing Procedures Determined with Three Different Techniques.

	EDS	ICP	XPS
unwashed	0.45 ± 0.004		0.18 ± 0.01
ethanol	0.94 ± 0.006	0.63 ± 0.01	0.46 ± 0.03
methanol/butanol	0.59 ± 0.003	0.61 ± 0.01	0.49 ± 0.03
acetone	0.68 ± 0.002	0.59 ± 0.02	0.58 ± 0.04