Figure 8: Comparison of orientation from GIXD and NEXAFS.
From: Molecular origin of high field-effect mobility in an indacenodithiophene–benzothiadiazole copolymer
The average orientation of the conjugated plane calculated from GIXD (
θπ
GIXD) as a function of the angle between the (010) reflection and the conjugated plane normal for (a) C16IDT-BT, (b) fast-dried, non-annealed P3HT and (c) fast-dried, non-annealed DPPT-T. The solid lines are guides to the eye. The upper and lower bounds of the pink areas in a denote the average orientation of the conjugated plane based on the corrected NEXAFS spectra (θπNEXAFS) of top and buried interfaces, respectively. The pink areas in b and c are artificially broadened in the vertical direction to match that of a, because P3HT and DPPT-T exhibit smaller differences between top and buried interfaces in NEXAFS. The light blue areas highlight the conjugated plane tilt range between 20° and 30°, that is, the most probable conjugated plane tilt range for alkylated polythiophenes.
