Remarkable effect of π-skeleton conformation in finitely conjugated polymer semiconductors. Issue 26 (17th June 2020)

• Record Type: Journal Article
• Authors: Chen, Zhihui; Zhang, Weifeng; Zhou, Yankai; Wei, Xuyang; Li, Chenyu; Wang, Liping; Yu, Gui
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 26(2020)
• Page Start: 9055
• Page End: 9063
• Publication Date: 2020-06-17
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc01303j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The remarkable effect of π-skeleton conformation in finitely conjugated polymers based on tetrafluoroethylene units was studied. Abstract : The structure–property relationship of finitely conjugated polymer semiconductors is underdeveloped to date. Herein, we report three novel tetrafluoroethylene-containing finitely conjugated polymers, PNBDO-T, PNBDO-BiT and PNBDO-TriT, containing electron-donating units of thiophene (T ), 2, 2′-bithiophene (BiT ), or 2, 2′:5′, 2′′-terthiophene (TriT ), respectively. All three polymers showed ambipolar charge transport characteristics under ambient conditions. PNBDO-BiT with a centrosymmetric BiT unit exhibited a maximum electron mobility of 4.15 cm 2 V −1 s −1, much higher than the mobilities of 1.01 × 10 −2 and 0.052 cm 2 V −1 s −1 of PNBDO-T and PNBDO-TriT, respectively, with axisymmetric T or TriT units. Meanwhile, PNBDO-BiT formed more ordered and crystalline molecular aggregation than the other two polymers. We attributed the differences to their π-skeleton conformations induced by the centrosymmetric or axisymmetric electron-donating units in these polymers. The results show that the construction of linear π-skeletons is of great importance in the development of high-performance finitely conjugated polymer semiconductors.