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We have experimentally tested the hypothesis of free charge carrier mediatedspin-transport in the small molecule organic semiconductor Alq3 at roomtemperature. A spin current was pumped into this material by pulsedferromagnetic resonance of an adjacent NiFe layer, while a charge currentresulting from this spin current via the inverse spin-Hall effect (ISHE) wasdetected in a Pt layer adjacent on the other side of the Alq3 layer, confirminga pure spin current through the Alq3 layer. Charge carrier spin states in Alq3,were then randomized by simultaneous application of electron paramagneticresonance (EPR). No influence of the EPR excitation on the ISHE current wasfound, implying that spin-transport is not mediated by free charge-carriers inAlq3.

Spin-transport in an organic semiconductor without free charge carrier involvement