Photovoltaic and spectral properties of conjugated polymer poly(3-octylthiophene) doped with various acceptor materials

Tsung Hsien Lee, Wei Hsin Chen, Mu Ting Su, Tzay Shing Lai, Wei Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We propose a novel approach for enhancement of efficiency of polymer-based photovoltaic devices by means of a low-molar-mass liquid crystal as a dopent. The active layers of the photovoltaic cells are primarily fabricated from the conjugated polymer poly(3-octylthiophene) as well as various acceptor substances including single-wall carbon nanotubes, buckminsterfullerene and the nematic liquid crystal E7 for comparison. The current-voltage characteristics are measured in dark and under green light illumination at wavelength of 514.5 nm. The power conversion efficiency for the active layer doped with E7 is the best among all cells in the simplest monolayer cell structure. Owing to the superior miscibility and orientational order of the nematic liquid crystal, E7 molecules may have promoted a composite film with fewer defects and locally helped the macromolecules align more orderly and consequently improved the charge-carrier transport, leading to the higher photocurrent and power conversion efficiency.

Original languageEnglish
Article number081601
JournalJapanese Journal of Applied Physics
Volume49
Issue number8 PART 1
DOIs
StatePublished - 1 Aug 2010

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