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Spin properties of interfaces with organic semiconductors studied by spin- and time-resolved two-photon photoemission

We review our recent work in the field of organic spintronics, and show that the spin- and time-resolved two-photon photoemission (STR-2PPE) technique can be used to obtain quantitative information about the spin-dependent properties of hybrid organic-inorganic interfaces, as well as about the spin-dependent transport in organic semiconductors. In addition, we present STR-2PPE measurements performed on the Co-copper phthalocyanine (CuPc) system at different temperatures to investigate the microscopic processes repsonsible for the spin-polarization decay in organic semiconductors and at interfaces with such materials. We found no significant temperature dependence of the spin-injection efficiency across the Co-CuPc interface as well as of the spin-polarization decay length in CuPc.