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Nam, Sungho,Hahm, Suk Gyu,Khim, Dongyoon,Kim, Hwajeong,Sajoto, Tissa,Ree, Moonhor,Marder, Seth R.,Anthopoulos, Thomas D.,Bradley, Donal D. C.,Kim, Youngkyoo American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.15
<P>Three triple bond-conjugated naphthalene diimide (NDI) copolymers, poly{[<I>N</I>,<I>N</I>′-bis(2-R<SUB>1</SUB>)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-<I>alt</I>-[(2,5-bis(2-R<SUB>2</SUB>)-1,4-phenylene)bis(ethyn-2,1-diyl)]} (PNDIR<SUB>1</SUB>-R<SUB>2</SUB>), were synthesized via Sonogashira coupling polymerization with varying alkyl side chains at the nitrogen atoms of the imide ring and 2,5-positions of the 1,4-diethynylbenzene moiety. Considering their identical polymer backbone structures, the side chains were found to have a strong influence on the surface morphology/nanostructure, thus playing a critical role in charge-transporting properties of the three NDI-based copolymers. Among the polymers, the one with an octyldodecyl (OD) chain at the nitrogen atoms of imide ring and a hexadecyloxy (HO) chain at the 2,5-positions of 1,4-diethynylbenzene, P(NDIOD-HO), exhibited the highest electron mobility of 0.016 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>, as compared to NDI-based copolymers with an ethylhexyl chain at the 2,5-positions of 1,4-diethynylbenzene. The enhanced charge mobility in the P(NDIOD-HO) layers is attributed to the well-aligned nano-fiber-like surface morphology and highly ordered packing structure with a dominant edge-on orientation, thus enabling efficient in-plane charge transport. Our results on the molecular structure-charge transport property relationship in these materials may provide an insight into novel design of n-type conjugated polymers for applications in the organic electronics of the future.</P> [FIG OMISSION]</BR>
Nielsen, Christian B.,Sohn, Eun-Ho,Cho, Dong-Jun,Schroeder, Bob C.,Smith, Jeremy,Lee, Mongryong,Anthopoulos, Thomas D.,Song, Kigook,McCulloch, Iain American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.5
<P>A benzotrithiophene polymer with a new thermally cleavable ketal substituent is reported. It is shown how this functional group can be used to facilitate solvent processing and, subsequently, how it can be removed by a thermal annealing process to generate a structurally ordered and crystalline thin film with significantly improved field-effect transistor properties.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-5/am303138q/production/images/medium/am-2012-03138q_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am303138q'>ACS Electronic Supporting Info</A></P>
Random benzotrithiophene-based donor–acceptor copolymers for efficient organic photovoltaic devices
Nielsen, Christian B.,Ashraf, Raja Shahid,Schroeder, Bob C.,D’Angelo, Pasquale,Watkins, Scott E.,Song, Kigook,Anthopoulos, Thomas D.,McCulloch, Iain The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.47
<P>A series of benzotrithiophene-containing random terpolymers for polymer solar cells is reported. Through variations of the two other components in the terpolymers, the absorption profile and the frontier energy levels are optimized and maximum power conversion efficiencies are nearly doubled (5.14%) relative to the parent alternating copolymer.</P> <P>Graphic Abstract</P><P>A series of benzotrithiophene-containing random terpolymers show greatly improved efficiencies in organic photovoltaic devices compared to the parent alternating copolymer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc31934a'> </P>