Fig. 5: Thickness dependence of the surface potential of the CuPc layer (X nm) with different bottom electrode layers. | Nature Communications

Fig. 5: Thickness dependence of the surface potential of the CuPc layer (X nm) with different bottom electrode layers.

From: Organic thermoelectric device utilizing charge transfer interface as the charge generation by harvesting thermal energy

Fig. 5

The electrode materials of Au, ITO, AZO, Ti, Fe, Cu, and Al were used. When the electrode work function values are closed to the Fermi energy (−4.5 eV) of a CuPc layer, almost no significant change of the surface potentials was observed. On the other hand, Al (−4.20 eV) and ITO (−5.0 eV) and Au (−5.3 eV) resulted in a large appearance of the surface potential shift to negative and positive, respectively, indicating the charge carrier injection for the electrodes into the CuPc layers due to the Fermi energy alignment.

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