1 research outputs found
Stepwise Structural Evolution of a DTS‑F<sub>2</sub>BT Oligomer and Influence of Structural Disorder on Organic Field Effect Transistors and Organic Photovoltaic Performance
No full textAn A–D–A oligomer,
DTSÂ(F<sub>2</sub>BT)<sub>2</sub>, was synthesized; its structural
evolution was studied with DSC,
POM, 2D-WAXD, and in-situ GI-XRD. The structural evolution of DTSÂ(F<sub>2</sub>BT)<sub>2</sub> is stepwise and kinetically slow. Both rapid
drying and the presence of PC<sub>71</sub>BM trapped DTSÂ(F<sub>2</sub>BT)<sub>2</sub> in a less ordered nematic (N) phase. PDMS-assisted
crystallization enabled a pristine DTSÂ(F<sub>2</sub>BT)<sub>2</sub> thin film to attain a more ordered equilibrium phase, and enhanced
the OFET mobility of DTSÂ(F<sub>2</sub>BT)<sub>2</sub>. In OPV devices,
DIO additive drove the DTSÂ(F<sub>2</sub>BT)<sub>2</sub> domains in
the DTSÂ(F<sub>2</sub>BT)<sub>2</sub>:PC<sub>71</sub>BM blended film
from the N phase toward the equilibrium phase, and resulted in enhanced
OPV performances. These results reveal the slow ordering process of
the A–D–A oligomer, and the importance of monitoring
the degree of structural evolution of the active thin films in organic
optoelectronics
