Abstract
-type GaAs 100 and the organic semiconductor copper phthalocyanine CuPc has been studied with ultraviolet photoemission spectroscopy and two-photon photoemission spectros-copy 2PPE . Spin-resolved 2PPE measurements show a highly efficient spin injection of hot electrons fromGaAs into CuPc, demonstrating that spin-polarized electrons originating from the GaAs substrate can beinjected into CuPc without any substantial spin-flip scattering at the interface. Furthermore, spin- and time-resolved 2PPE measurements are employed to study the temporal evolution of the spin polarization injectedinto the organic layer in the range up to 1 ps after injection from the GaAs substrate. The results show that thedegree of spin polarization of electrons injected through the GaAs/CuPc interface into molecular orbitals justabove the lowest unoccupied molecular orbital onset of CuPc is preserved longer than the spin polarization ofelectrons injected in energetically higher lying states.DOI: 10.1103/PhysRevB.78.075311 PACS number s : 79.60.Fr, 78.47.J , 72.25. b, 85.75. d
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