Figure 2

XPS analysis on cathode interlayer: (a) carbon (285.2 eV (C1s)); (b) Zinc (1023.0 eV (2p_3/2) and 1046.0 eV (2p_1/2));(c) Indium (444.6 eV (2d_5/2) and 452.4 eV (2d_3/2)); (d) Oxygen (531 eV (O 1s)) BE; and (e) depth profiles of the atom ratios C/Zn and In/Zn in InZnO and InZnO-BisC60.