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Effect of structural isomerism in BODIPY based donor-acceptor co-polymers on their photovoltaic performance

Tarafdar, Gourav and Sengupta, Sanchita and Pandey, Upendra K and Ramamurthy, Praveen C (2019) Effect of structural isomerism in BODIPY based donor-acceptor co-polymers on their photovoltaic performance. In: SOLAR ENERGY, 186 . pp. 215-224.

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Official URL: https://dx.doi.org/10.1016/j.solener.2019.04.093


Borondipyrromethene or BODIPY can be incorporated into the polymer backbone through either the alpha (or 2,6) positions or the beta (3,5) positions and hence resulting in polymers exhibiting structural isomerism. In this work two pairs of such isomeric D-A polymers formed by copolymerization of BODIPY with benzodithiophene (P1 and P2) and fluorene (P3 and P4) separately are reported along with structure property correlation. Depending on the positions of attachment of the BODIPY unit in the isomeric polymers, the geometry of the polymer backbone is either coiled or linear which in turn affects physical properties such as thermal stability, solubility and absorption, electronic properties such as delocalization of molecular orbitals, HOMO-LUMO energy levels and band gap. Though the charge carrier mobility seems to remain unaffected due to the isomerism of the polymer backbone, the alpha connected polymers perform better than the beta connected polymers when used as electron acceptor along with P3HT in all polymer solar cells. This is also the first instance of application of BODIPY copolymers as electron acceptor in organic solar cells.

Item Type: Journal Article
Publication: SOLAR ENERGY
Publisher: ELSEVIER
Additional Information: copyright for this article belongs to ELSEVIER
Department/Centre: Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 02 Dec 2019 10:20
Last Modified: 02 Dec 2019 10:20
URI: http://eprints.iisc.ac.in/id/eprint/63207

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