Semicrystalline D-A copolymers with different chain curvature for applications in polymer optoelectronic devices
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- Semicrystalline D-A copolymers with different chain curvature for applications in polymer optoelectronic devices
- Lee, Wonho; Kim, Gi-Hwan; Ko, Seo-Jin; Yum, Seungjib; Hwang, Sungu; Cho, Shinuk; Shin, Young-Han; Kim, Jin Young; Woo, Han Young
- Attractive interactions; Device properties; Morphological changes; Morphological stability; Photovoltaic characteristics; Photovoltaic property; Polymer optoelectronics; Power conversion efficiencies
- Issue Date
- AMER CHEMICAL SOC
- MACROMOLECULES, v.47, no.5, pp.1604 - 1612
- Thiophene- and thienothiophene-based donor-acceptor (D-A) 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···O and C-H···N attractive interactions, etc., in the polymer chain. PTTBT14 is linear, whereas PTBT14 is curved owing to ∼160° 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-1 s-1 for PTTBT14 compared to 0.02 cm2 V-1 s-1 for PTBT14) in PFETs with remarkable morphological stability and no deterioration in device properties at temperatures up to 250 °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 PC 61BM, showing the poor photovoltaic characteristics.
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