Effect of branched alkyl side chains on the performance of thin‐film transistors and photovoltaic cells fabricated with isoindigo‐based conjugated polymers. Issue 10 (21st February 2015)

• Record Type: Journal Article
• Authors: Park, Gi Eun; Shin, Jicheol; Lee, Dae Hee; Cho, Min Ju; Choi, Dong Hoon
• Is Part Of: Journal of polymer science. Volume 53:Issue 10(2015:May)
• Page Start: 1226
• Page End: 1234
• Publication Date: 2015-02-21
• Subjects: 547
• DOI: 10.1002/pola.27555
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>New isoindigo and di(thienyl)ethylene‐containing π‐extended conjugated polymers with different branched side chains were synthesized to investigate their physical properties and device performance in thin‐film transistors and photovoltaic cells. 11‐Butyltricosane (S3) and 11‐heptyltricosane (S6) groups were used as side‐chain moieties tethered to isoindigo units. The linking groups between the polymer backbone and bifurcation point in the branched side chain differ in the two polymers (i.e., <bold>PIDTE‐S3</bold> and <bold>PIDTE‐S6</bold>). The polymers bearing S6 side chains showed much better charge transport behavior than those with S3 side chains. Thermally annealed <bold>PIDTE‐S6</bold> film exhibited an outstanding hole mobility of 4.07 cm² V⁻¹ s⁻¹ under ambient conditions. Furthermore, bulk heterojunction organic photovoltaic cells made from a blend film of <bold>PIDTE‐S3</bold> and (6, 6)‐phenyl C61‐butyric acid methyl ester demonstrated promising device performance with a power conversion efficiency in the range of 4.9–5.0%. © 2015 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem <bold>2015</bold>, <italic>53</italic>, 1226–1234</p> </abstract>