Design and synthesis of thieno[3,4‐ c ]pyrrole‐4,6‐dione based conjugated copolymers for organic solar cells

Kotturappa, Chandrashekara G.; Gopikrishna, Murali M.; Rao, Arun D.; Ramamurthy, Praveen C.

doi:10.1002/pi.5377

Title: Design and synthesis of thieno[3,4‐ c ]pyrrole‐4,6‐dione based conjugated copolymers for organic solar cells

Journal Article · Tue May 09 00:00:00 EDT 2017 · Polymer International

DOI:https://doi.org/10.1002/pi.5377· OSTI ID:1398069

^[1]; Gopikrishna, Murali M. ^[1]; Rao, Arun D. ^[1];

^[2]

Department of Materials Engineering Indian Institute of Science Bangalore India
Department of Materials Engineering Indian Institute of Science Bangalore India, Center for Nanoscience and Engineering Indian Institute of Science Bangalore India

Abstract A new series of conjugated copolymers ( PBDT‐TPD , PBDT ‐Th‐ TPD , PBDT‐TT‐TPD ) containing donor–acceptor (D − A) structure electron‐rich benzo[1,2‐ b :4,5‐ b ′]dithiophene ( BDT ) units with branched alkyl thiophene side chains and electron‐deficient 5‐(2‐octyl)‐4 H ‐thieno[3,4‐ c ]pyrrole‐4,6(5 H )‐dione (TPD) units was designed and synthesized. To tune the optical and electrochemical properties of the copolymers, the conjugation length of the copolymers was extended by introducing π‐conjugated spacers such as thiophene and thieno[3,2‐ b ]thiophene units. It was observed that PBDT‐TPD showed broader absorption spectra in the longer wavelength region and the absorption maximum was red‐shifted compared to that of PBDT‐Th‐TPD, PBDT‐TT‐TPD. Stokes shifts were calculated to be 52 nm for PBDT‐TPD, 153 nm for PBDT‐Th‐TPD and 146 nm for PBDT‐TT‐TPD. Further, PBDT‐TPD exhibited a deeper highest occupied molecular orbital energy level of −5.53 eV as calculated by cyclic voltammetry. Bulk heterojunction solar cells fabricated using PBDT‐TPD as donor material exhibited a power conversion efficiency of 1.92%. © 2017 Society of Chemical Industry

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Sponsoring Organization:: USDOE

OSTI ID:: 1398069

Journal Information:: Polymer International, Journal Name: Polymer International Vol. 66 Journal Issue: 8; ISSN 0959-8103

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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