Semicrystalline D鈥揂 Copolymers with Different Chain Curvature for Applications in Polymer Optoelectronic Devices

详细信息    查看全文

• 作者：Wonho Lee ; Gi-Hwan Kim ; Seo-Jin Ko ; Seungjib Yum ; Sungu Hwang ; Shinuk Cho ; Young-Han Shin ; Jin Young Kim ; Han Young Woo
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：March 11, 2014
• 年：2014
• 卷：47
• 期：5
• 页码：1604-1612
• 全文大小：606K
• 年卷期：v.47,no.5(March 11, 2014)
• ISSN：1520-5835

文摘

Thiophene- and thienothiophene-based donor鈥揳cceptor (D鈥揂) type semicrystalline copolymers with different backbone curvatures, PTBT14 and PTTBT14, were designed and synthesized. Both the polymers exhibit a nearly planar structure via noncovalent S路路路O and C鈥揌路路路N attractive interactions, etc., in the polymer chain. PTTBT14 is linear, whereas PTBT14 is curved owing to 160掳 bond angle of the thiophene linkage. PTTBT14 showed the higher degree of interchain ordering with edge-on orientation, resulting in efficient charge transport (0.26 cm² V^鈥? s^鈥? for PTTBT14 compared to 0.02 cm² V^鈥? s^鈥? for PTBT14) in PFETs with remarkable morphological stability and no deterioration in device properties at temperatures up to 250 掳C. On the other hand, the curved shape of PTBT14 attributed to its improved photovoltaic properties with a power conversion efficiency of 5.56%. The linear PTTBT14 showed much stronger self-interactions with negligible morphological changes and little miscibility with PC₆₁BM, showing the poor photovoltaic characteristics.