Thienothiophene-benzoxadiazole based conjugated copolymer for organic photovoltaic application

Kottokkaran, Ranjith and A, Vishnumurthy and Kesavan, Arul Varman and NV, Vinila and Ramamurthy, Praveen C (2017) Thienothiophene-benzoxadiazole based conjugated copolymer for organic photovoltaic application. In: Materials Today Communications, 11 . pp. 132-138. ISSN 23524928

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Abstract

In present study a novel conjugated polymer of alternating thienothiophene and benzoxadiazole based units (poly(TT-alt-DTOT)) is synthesized and characterized. The polymer shows excellent thermal stability, good solubility and exhibit an optical band gap of ∼1.81 eV. Density functional theory (DFT) calculation of poly(TT-alt-DTOT) indicates that highest occupied molecular orbital (HOMO) is completely delocalized throughout the polymer and the lowest unoccupied molecular orbital (LUMO) is localized mainly along its acceptor part. Furthermore bulk heterojunction solar cells were fabricated using poly(TT-alt-DTOT) as donor and fullerene derivative (PC60BM and PC70BM) as the acceptors. Preliminary device study of the fabricated device shows a power conversion efficiency of 2.06% with a short circuit current density of 8.8 mA cm−2, an open circuit voltage of 0.76 V. This polymer can be further optimized for efficient photovoltaic material.

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Bulk heterojunction; Conducting polymer; Copolymer; Organic solar cells
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Jun 2022 05:01
Last Modified:	01 Jun 2022 05:01
URI:	https://eprints.iisc.ac.in/id/eprint/72875

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