Correlating Nanomorphology with Charge‐Transport Anisotropy in Conjugated‐Polymer Thin Films

Anisotropic mobility in spin‐coated MEH‐PPV films is due to an interfacial layer of several nanometers at the film‐substrate interface with a higher electron density assisted by local chain alignment parallel to the substrate. This layer is formed via spin‐coating. The strength of this interface effect is dependent on the solvent used.