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Interface formation between tris(8-hydroxyquinoline) aluminum and ZnO nanowires and film
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The energy level alignments at the interface between tris(8-hydroxyquinoline) aluminum and ZnOnanowires and thin film were studied with in situx-ray and ultraviolet photoemission spectroscopy. The changes of work functions, highest occupied molecular orbitals, and core levels were measured with step-by-step deposition of on each ZnO substrate. Although both substrates show similar electronic structures, a larger interface dipole is induced at the interface between and ZnOnanowires. This results in the reduction of the electron injection barrier at the interface of nanowires. Thus, the ZnOnanowire substrate is expected to show better performance than that of ZnOfilm when used as a cathode. We discussed the different interface dipole formation at each interface.
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