Fig. 5. Energy-level diagrams of PEDOT:PSS/C60 and DMSO-PEDOT:PSS/C60. EF, EVAC, Ψ, eD, IE, LUMO, and HOMO denote the Fermi level, vacuum level, work function, interface dipole, ionization energy, lowest unoccupied molecular orbital, and highest occupied molecular orbital, respectively.
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