Groesbeck Matthew, Liu Haoliang, Kavand Marzieh, Lafalce Evan, Wang Jingying, Pan Xin, Tennahewa Taniya Hansika, Popli Henna, Malissa Hans, Boehme Christoph, Vardeny Z Valy
Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.
Phys Rev Lett. 2020 Feb 14;124(6):067702. doi: 10.1103/PhysRevLett.124.067702.
We have experimentally tested whether spin-transport and charge-transport in pristine π-conjugated polymer films at room temperature occur via the same electronic processes. We have obtained the spin diffusion coefficient of several π-conjugated polymer films from the spin diffusion length measured by the technique of inverse spin Hall effect and the spin relaxation time measured by pulsed electrically detected magnetic resonance spectroscopy. The charge diffusion coefficient was obtained from the time-of-flight mobility measurements on the same films. We found that the spin diffusion coefficient is larger than the charge diffusion coefficient by about 1-2 orders of magnitude and conclude that spin and charge transports in disordered polymer films occur through different electronic processes.
