Stepwise Structural Evolution of a DTS-F 2 BT Oligomer and Influence of Structural Disorder on Organic Field Effect Transistors and Organic Photovoltaic Performance

Chi Feng Huang, Sin Hong Huang, Chou Ting Hsieh, Yi Hsiang Chao, Chia Hua Li, San Lien Wu, Yi Fan Huang, Chen Yang Hong, Chain-Shu Hsu, Wei Tsung Chuang*, Chien-Lung Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

An A-D-A oligomer, DTS(F 2 BT) 2 , was synthesized; its structural evolution was studied with DSC, POM, 2D-WAXD, and in-situ GI-XRD. The structural evolution of DTS(F 2 BT) 2 is stepwise and kinetically slow. Both rapid drying and the presence of PC 71 BM trapped DTS(F 2 BT) 2 in a less ordered nematic (N) phase. PDMS-assisted crystallization enabled a pristine DTS(F 2 BT) 2 thin film to attain a more ordered equilibrium phase, and enhanced the OFET mobility of DTS(F 2 BT) 2 . In OPV devices, DIO additive drove the DTS(F 2 BT) 2 domains in the DTS(F 2 BT) 2 :PC 71 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.

Original languageEnglish
Pages (from-to)8980-8987
Number of pages8
JournalChemistry of Materials
Volume28
Issue number24
DOIs
StatePublished - 27 Dec 2016

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