Remanent polarization in a cryptand-polyanion bilayer implemented in an organic field effect transistor
We investigate the possibility to maintain an electric polarization in an organic bilayer via ion trapping, i.e., without any external bias. In the cryptand-polyanion bilayer, ions of specific size can be strongly coordinated with organic macrocyclic molecules. Cations move from the polyanion layer to the cryptand layer upon applying a bias and are trapped in this layer. As a result, the voltage dependence of the polarization displays a hysteresis. The bilayer is then advantageously used as an electronic insulating layer in an organic field effect transistor. The ions trapping and de-trapping can be followed by the amplitude of the threshold voltage (V(th)) shift as well as its temporal evolution. ; Funding Agencies|Swedish Government||Swedish Foundation for Strategic Research||Brains and Bricks||Linkoping University||Knut and Alice Wallenberg Foundation||Onnesjo Foundation||