Polymer solar cells with enhanced open-circuit voltage and efficiency

Hsiang Yu Chen, Jianhui Hou, Shaoqing Zhang, Yongye Liang, Guanwen Yang, Yang Yang, Luping Yu, Yue Wu, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2999 Citations (Scopus)


Following the development of the bulk heterojunction structure, recent years have seen a dramatic improvement in the efficiency of polymer solar cells. Maximizing the open-circuit voltage in a low-bandgap polymer is one of the critical factors towards enabling high-efficiency solar cells. Study of the relation between open-circuit voltage and the energy levels of the donor/acceptor in bulk heterojunction polymer solar cells has stimulated interest in modifying the open-circuit voltage by tuning the energy levels of polymers. Here, we show that the open-circuit voltage of polymer solar cells constructed based on the structure of a low-bandgap polymer, PBDTTT, can be tuned, step by step, using different functional groups, to achieve values as high as 0.76V. This increased open-circuit voltage combined with a high short-circuit current density results in a polymer solar cell with a power conversion efficiency as high as 6.77%, as certified by the National Renewable Energy Laboratory.
Original languageEnglish
Pages (from-to)649-653
Number of pages5
JournalNature Photonics
Issue number11
Publication statusPublished - 1 Nov 2009
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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