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Interfacial electronic structures of molecules on a K-doped CuPc surface
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The evolution of interfacial electronic structures of on a K-doped CuPc surface is studied via synchrotron-radiation photoemission spectroscopy. Layer-by-layer growth has been identified. As the heterointerface formed, the K diffuses into the overlayer, and transfers negative charge into the lowest unoccupied molecular orbital (LUMO) of , resulting in a significant interfacial dipole potential. With K doping, increased photon absorption, due to the existence of gap states, and an enhanced energy-level difference between the LUMO of and the highest occupied molecular orbital of CuPc could possibly improve the efficiency of organic photovoltaicdevices.
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