Electron spin resonance (ESR) measurements are performed on field-induced charge carriers in high-mobility organic transistors of polycrystalline dioctylbenzothieno[2,3-b]benzothiophene (C8-BTBT) films. The angular dependences of the ESR spectra are well fitted by orthorhombic g values with the largest component of gY = 2.0110 nearly parallel to the normal direction of the substrate but tilted by 5°. The results indicate a highly organized end-on alignment of C8-BTBT molecules at the device interface. The ESR linewidth exhibits motional narrowing down to 4 K, providing microscopic evidence for high carrier mobilities within the crystalline domains of C8-BTBT.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2011 Aug 29|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics