Side-chain architectures of 2,7-carbazole and quinoxaline-based polymers for efficient polymer solar cells

Ergang Wang, Lintao Hou, Zhongqiang Wang, Zaifei Ma, Stefan Hellstrom, Wenliu Zhuang, Fengling Zhang, Olle Inganas, Mats R. Andersson

    Research output: Contribution to journalArticlepeer-review

    120 Citations (Scopus)

    Abstract

    Three polymers bearing a common carbazole-thiophene-quinoxaline-thiophene backbone, but different side chains, were designed and synthesized in order to investigate the effect of side chains on their photovoltaic performance. Their photophysical, electrochemical, and photovoltaic properties were investigated and compared. The polymer EWC3, with the largest amount of side chains, showed the highest power conversion efficiency of 3.7% with an open-circuit voltage (Voc) of 0.92 V. The atomic force microscopy images of the active layers of the devices showed that the morphology was highly influenced by the choice of the solvent and processing additive. It is worth noting that polymer solar cells (PSCs) fabricated from EWC3, with branched side chains on the carbazole units, gave a much higher V oc than the devices made from EWC1, which bears the same electron-deficient segment as EWC3 but straight side chains on carbazole units. This study offered a useful and important guideline for designing 2,7-carbazole-based polymers for high-performance PSCs.

    Original languageEnglish
    Pages (from-to)2067-2073
    Number of pages7
    JournalMacromolecules
    Volume44
    Issue number7
    DOIs
    Publication statusPublished - 12 Apr 2011

    Fingerprint Dive into the research topics of 'Side-chain architectures of 2,7-carbazole and quinoxaline-based polymers for efficient polymer solar cells'. Together they form a unique fingerprint.

    Cite this