The study of solvent additive effects in efficient polymer photovoltaics via impedance spectroscopy

En Ping Yao, Chun Chao Chen, Jing Gao, Yongsheng Liu, Qi Chen, Min Cai, Wei Chou Hsu, Ziruo Hong, Gang Li, Yang Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

72 Citations (Scopus)


1, 8-Diiodooctane (DIO) has been known for its role of improving the polymer morphology and enhancing performance of polymer bulk heterojunction (BHJ) solar cell. In this work, the impedance spectroscopy was used to investigate the interface of poly(4,8-bis-alkyloxybenzo(1,2-b:4,5-b′) dithiophene-2,6-diyl-alt- (alkyl thieno(3,4-b) thiophene-2-carboxylate)-2,6- diyl) (PBDTTT-C):PC70BM in BHJ with DIO as additive. Based on our results, we were able to simulate the device into an equivalent circuit model, which allows us to conveniently analyze the organic/organic interfacial contact in the organic photovoltaic (OPV) device. Thus, we demonstrate that the impedance spectroscopy can an effective approach in characterizing the donor/acceptor interfaces, such that a direct correlation can be established between the morphology and the device performance of BHJ devices.
Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalSolar Energy Materials and Solar Cells
Publication statusPublished - 1 Jan 2014
Externally publishedYes


  • Bulk heterojuction
  • Impedance spectroscopy
  • Interface
  • OPV

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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