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Design and synthesis of thieno3,4-c]pyrrole-4,6-dione based conjugated copolymers for organic solar cells

Kotturappa, Chandrashekara G and Gopikrishna, Murali M and Rao, Arun D and Ramamurthy, Praveen C (2017) Design and synthesis of thieno3,4-c]pyrrole-4,6-dione based conjugated copolymers for organic solar cells. In: POLYMER INTERNATIONAL, 66 (8). pp. 1206-1213.

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Official URL: http://dx.doi.org/10.1002/pi.5377

Abstract

A new series of conjugated copolymers (PBDT-TPD, PBDT-Th-TPD, PBDT-TT-TPD) containing donor-acceptor (D-A) structure electron-rich benzo1,2-b:4,5-b]dithiophene (BDT) units with branched alkyl thiophene side chains and electron-deficient 5-(2-octyl)-4H-thieno3,4-c]pyrrole-4,6(5H)-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 -conjugated spacers such as thiophene and thieno3,2-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%. (c) 2017 Society of Chemical Industry

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
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Depositing User: Id for Latest eprints
Date Deposited: 29 Jul 2017 10:22
Last Modified: 29 Jul 2017 10:22
URI: http://eprints.iisc.ac.in/id/eprint/57495

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