End Capping Does Matter: Enhanced Order and Charge Transport in Conjugated Donor-Acceptor Polymers

Unsal Koldemir, Sreenivasa Reddy Puniredd, Manfred Wagner, Sefaattin Tongay, Tracy D. McCarley, George Dimitrov Kamenov, Klaus Müllen, Wojciech Pisula, John R. Reynolds

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Optimized microstructure through control of both intra- and intermolecular interactions in organic semiconductors is critical for enhancing and optimizing charge transport for the realization of next-generation low-cost, mechanically flexible, and easy to process high performance, organic field effect transistors (OFETs). Herein, we report donor-acceptor alternating copolymers of dithienogermole (DTG) with 2,1,3-benzothiadiazole (BTD) and probe the importance of end groups on the control of molecular order and microstructure as it relates to the enhancement of charge carrier transport. Partial end-capping reactions, confirmed by 1H NMR and matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) analyses, on the DTG-BTD copolymer provided significant improvement in grazing incidence wide angle X-Ray scattering (GIWAXS) determined polymer ordering in thin films. Consequently, OFETs exhibited charge-carrier mobilities up to 0.60 cm2/(Vs) for the end-capped copolymer, which are an order of magnitude higher in comparison to the non-end-capped analogue, which displayed a mobility of 0.077 cm2/(Vs). We emphasize that a simple synthetic approach, the introduction of end-capping groups which remove reactive functionalities, can be effective in the development of next-generation OFET and solar materials by promising better control of the polymer organization.

Original languageEnglish (US)
Pages (from-to)6369-6377
Number of pages9
Issue number18
StatePublished - Sep 22 2015

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Organic Chemistry


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