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Two Acceptor One Donor Random Terpolymer Comprising of Thiophene and Phenyl Capped Diketopyrrolopyrrole for Organic Photovoltaics

Abstract

A series of random terpolymer comprised of two electron deficient phenyl (PDPP) and thiophene (ThDPP) capped diketopyrrolopyrrole (DPP) in conjugation with electron donating thiophene moiety were synthesised using stille coupling. Their optical properties, energy levels, hole mobility, crystallinity and solar cell device performance can be systematically fine-tuned by controlling the molar ratio between ThDPP/PDPP (30/70 ,50/50, 70/30, and 90/10) content in the polymer backbone. Herein, we find that the crystalline properties and the hole mobility of the terpolymer are enhanced by increasing ThDPP content in the polymer backbone. However, increasing PDPP content shows low hole mobility and weak crystalline features. These characteristic features afford remarkable effect on the solar cell device performance. Bulk heterojunction (BHJ) solar cells were constructed by taking these random terpolymer as a donor materials and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as an acceptor. The best device performances were obtained for the polymer P5T5P that acquire ThDPP/PDPP ratio of 50/50 with power conversion efficiency (PCE) of 2.9% due to balanced charge carrier mobility and optimized crystallinity results good miscibility and favorable surface morphology with fullerene acceptor. This work represents, the better control of crystallinity of polymer donor through structural engineering will greatly helps in improving device performance.

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Publication details

The article was received on 15 Jul 2018, accepted on 29 Oct 2018 and first published on 30 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ03536A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Two Acceptor One Donor Random Terpolymer Comprising of Thiophene and Phenyl Capped Diketopyrrolopyrrole for Organic Photovoltaics

    S. B, E. Varathan, V. Subramanian and N. Somanathan, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03536A

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