Stepwise Structural Evolution of a DTS-F2BT Oligomer and Influence of Structural Disorder on Organic Field Effect Transistors and Organic Photovoltaic Performance

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• 作者：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 ChuangChien-Lung Wang
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 27, 2016
• 年：2016
• 卷：28
• 期：24
• 页码：8980-8987
• 全文大小：510K
• ISSN：1520-5002

文摘

An A–D–A oligomer, DTS(F₂BT)₂, was synthesized; its structural evolution was studied with DSC, POM, 2D-WAXD, and in-situ GI-XRD. The structural evolution of DTS(F₂BT)₂ is stepwise and kinetically slow. Both rapid drying and the presence of PC₇₁BM trapped DTS(F₂BT)₂ in a less ordered nematic (N) phase. PDMS-assisted crystallization enabled a pristine DTS(F₂BT)₂ thin film to attain a more ordered equilibrium phase, and enhanced the OFET mobility of DTS(F₂BT)₂. In OPV devices, DIO additive drove the DTS(F₂BT)₂ domains in the DTS(F₂BT)₂:PC₇₁BM 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.