Kumar, B. Sambath and Kumar, P. Shyam Vinod and Deepakrao, F. Shantanu and Iyer, S. Sundar Kumar and Subramanian, V. and Datt, Ram and Gupta, Vinay and Chand, Suresh and Somanathan, N. (2016) Two Donor-One Acceptor Random Terpolymer Comprised of Diketopyrrolopyrrole Quaterthiophene with Various Donor pi-Linkers for Organic Photovoltaic Application. Journal of Physical Chemistry C, 120 (47). 26609-26619 . ISSN 1932-7447

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Abstract

A series of terpolymers based on diketopyrrolopyrrole (DPP) and quaterthiophene (QT) connected randomly using various electron-donating pi-linkers such as fluorene (P4TFDPP), thiophene (P5TDPP), phenyl (P4TPDPP), and vinyl (P4TVDPP) have been designed and synthesized via Suzuki and Stile polymerization. In this work we studied the influence of the pi-linker and the effect on their photophysical properties, and energy levels, band gap, packing nature, surface morphology, carrier mobility, and photovoltaic behavior were analyzed using various techniques and correlated with quantum chemical calculation. Bulk hetero-junction (BHJ) solar cells were fabricated using these polymers as donor materials and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as an acceptor. A high molecular weight with larger absorption coefficient and high hole mobility were achieved for copolymer P4TFDPP compared to other copolymers. The best photovoltaic performances were achieved for the polymer P4TFDPP with a power conversion efficiency (PCE) of 4.9%, with V-oc = 0.88 V, J(sc) = 9.4 mA/cm(2), and FF = 59%, which is the highest PCE, J(sc), and FF for the fluorene-DPP copolymeric system compared to that previously reported in the literature, while P5TDPP, P4TVDPP, and P4TPDPP show a PCE of 4.1%, 2.9%, and 3.9%, respectively. This work exhibits the importance of selecting a proper pi-linker in the random terpolymer to provide an efficient approach for enhancing the PCE in polymer solar cells.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Chemical Society.
Subjects:	Chemistry > Physical Chemistry Materials Science Nanoscience/ Nanotechnology
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	23 Apr 2018 12:08
Last Modified:	23 Apr 2018 12:08
URI:	http://npl.csircentral.net/id/eprint/2403

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