Influence of Acid Modification Multiwall Carbon Nanotube Counter Electrodes on the Glass and Flexible Dye-Sensitized Solar Cell Performance

Table 1

Summary of the peak positions and the O/C area ratio of U-CNTs and M-CNTs from XPS measurement.

Sample	Relative amount of elements (%)			Binding energy (eV)
	O	C	O/C	Peak 1; C–C	Peak 2; –C–OH	Peak 3; C–O–C	Peak 4; –C=O
Unmodified-CNTs; (U-CNTs)	57	43	0.75	284.1	286	288	—
Modified-CNTs; (M-CNTs)	53	47	0.89	284.2	285.5	287.6	289.3