Highly efficient solar cell polymers developed via fine-tuning of structural and electronic properties

Yongye Liang, Danqin Feng, Yue Wu, Szu Ting Tsai, Gang Li, Claire Ray, Luping Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1227 Citations (Scopus)

Abstract

This paper describes synthesis and photovoltaic studies of a series of new semiconducting polymers with alternating thieno[3,4-b]thiophene and benzodithiophene units. The physical properties of these polymers were finely tuned to optimize their photovoltaic effect. The substitution of alkoxy side chains to the less electron-donating alkyl chains or introduction of electron-withdrawing fluorine into the polymer backbone reduced the HOMO energy levels of polymers. The structural modifications optimized polymers' spectral coverage of absorption and their hole mobility, as well as miscibility with fulleride, and enhanced polymer solar cell performances. The open circuit voltage, Voc, for polymer solar cells was increased by adjusting polymer energy levels. It was found that films with finely distributed polymer/fulleride interpenetrating network exhibited improved solar cell conversion efficiency. Efficiency over 6% has been achieved in simple solar cells based on fluorinated PTB4/PC61BM films prepared from mixed solvents. The results proved that polymer solar cells have a bright future.
Original languageEnglish
Pages (from-to)7792-7799
Number of pages8
JournalJournal of the American Chemical Society
Volume131
Issue number22
DOIs
Publication statusPublished - 10 Jun 2009
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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