Binary Solvent Additives Treatment Boosts the Efficiency of PTB7:PCBM Polymer Solar Cells to Over 9.5%

Yifan Zheng, Gang Wang, Di Huang, Jaemin Kong, Teng Hooi Goh, Wei Huang, Junsheng Yu, André D. Taylor

Research output: Contribution to journalArticle

Abstract

In this work, a 9.5% of power conversion efficiency (PCE) is obtained in the thieno [3,4-b] thiophene/benzodithiophene (PTB7): (6,6)-phenyl-C70-butyric acid methyl ester (PC70BM) based polymer solar cell (PSC) by using a novel binary solvent additive of diphenyl ether (DPE): 1,8-diiodoctane (DIO). We find that this binary solvent additive approach increases the PTB7 donor crystallinity using DPE and enhances the PC70BM dispersion using DIO. This amended aggregation results in a better donor/acceptor phase separation. We show that the improved crystallization and face-on orientation preference of PTB7 contributes to higher light absorption and charge transport efficiency in the active layer. Moreover, a better D/A phase separation provides more efficient charge extraction and suppresses the charge recombination, leading to an improved FF >70%.

Original languageEnglish (US)
Article number1700144
JournalSolar RRL
Volume2
Issue number4
DOIs
StatePublished - Apr 1 2018

Keywords

  • DIO
  • DPE
  • PTB7
  • binary solvent additives
  • polymer solar cells

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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  • Cite this

    Zheng, Y., Wang, G., Huang, D., Kong, J., Goh, T. H., Huang, W., Yu, J., & Taylor, A. D. (2018). Binary Solvent Additives Treatment Boosts the Efficiency of PTB7:PCBM Polymer Solar Cells to Over 9.5%. Solar RRL, 2(4), [1700144]. https://doi.org/10.1002/solr.201700144