%0 Journal Article
%T Long spin diffusion lengths in doped conjugated polymers due to enhanced exchange coupling
%J -
%D 2019
%R https://doi.org/10.1038/s41928-019-0222-5
%X Carbon-based semiconductors such as conjugated organic polymers are of potential use in the development of spintronic devices and spin-based information processing. In particular, these materials offer a low spin¨Corbit coupling strength due to their relatively light constituent chemical elements, which should, in principle, favour long spin diffusion lengths. However, organic polymers are relatively disordered materials and typically have a carrier mobility that is orders of magnitude lower than crystalline inorganic materials. As a result, small spin diffusion lengths of around 50£¿nm have typically been measured using vertical organic spin valves. Here, we report measuring spin diffusion lengths in doped conjugated polymers using a lateral spin transport device architecture, which is based on spin pumping injection and inverse spin Hall detection. The approach suggests that long spin diffusion lengths of more than 1£¿¦Ìm and fast spin transit times of around 10£¿ns are possible in conjugated polymer systems when they have a sufficiently high spin density (around 1020£¿cm£¿3). We explain these results in terms of an exchange-based spin diffusion regime in which the exchange interactions decouple spin and charge transport
%U https://www.nature.com/articles/s41928-019-0222-5