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Issue 21, 2016
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Medium bandgap copolymers based on carbazole and quinoxaline exceeding 1.0 V open-circuit voltages

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Abstract

Open-circuit voltage (VOC) is an important parameter in determining the performance of polymer solar cells (PSCs). Given the desire for superior VOC values in PSCs, we have designed and synthesized a series of ‘medium bandgap’ donor–acceptor (D–A) copolymers containing carbazole (Cz) and quinoxaline (Qx) (PCzDT-Qx, PCzDT-fQx, and PCzDT-ffQx). As a result of their deep-lying HOMO levels (−5.45 to −5.61 eV), high VOC values are achieved in PSCs with the resulting copolymers, despite the expense of short-circuit current density (JSC) and fill factor (FF) parameters. In this study, in addition to the best power-conversion efficiency (PCE) of up to 4.03% from PCzDT-fQx-based on PSCs, we have demonstrated a VOC value exceeding 1.0 V with PSCs of PCzDT-ffQx, which is among the highest VOC values achieved to date. Moreover, a comprehensive investigation on the mechanism of charge recombination and transport characteristics can determine a clear structure–property correlation in this class of molecules, which is helpful for designing better materials with maximum VOC without scarifying other key photovoltaic parameters.

Graphical abstract: Medium bandgap copolymers based on carbazole and quinoxaline exceeding 1.0 V open-circuit voltages

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Publication details

The article was received on 26 Nov 2015, accepted on 02 Feb 2016 and first published on 03 Feb 2016


Article type: Paper
DOI: 10.1039/C5RA25088A
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2016,6, 17624-17631
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    Medium bandgap copolymers based on carbazole and quinoxaline exceeding 1.0 V open-circuit voltages

    K. C. Lee, T. Kim, S. Song, Y. Kim, Gitish. K. Dutta, D. S. Kim, J. Y. Kim and C. Yang, RSC Adv., 2016, 6, 17624
    DOI: 10.1039/C5RA25088A

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