TFSA doped interlayer for efficient organic solar cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • Yubin Xiao
  • Shuang Zhou
  • Yaorong Su
  • Lei Ye
  • Fangyan Xie
  • Jianbin Xu

Detail(s)

Original languageEnglish
Pages (from-to)3702-3709
Journal / PublicationOrganic Electronics: physics, materials, applications
Volume15
Issue number12
Publication statusPublished - Dec 2014

Abstract

Organic solar cells based on bis(trifluoromethanesulfonyl)amide (TFSA, [CF3SO2]2NH) doped poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT) were fabricated to investigate the effect of molecular doping. By replacing poly(3,4-ethylenedioxythiophene) (PEDOT): poly(styrenesulfonate) (PSS) with a thin TFSA layer, we have found more efficient charge injection at anode/active interface enhanced photovoltaic performance. The doping effect is confirmed by photoemission spectroscopy that the Fermi level of doped PCDTBT shifts downward to its HOMO level and results in higher carrier concentration. The reduced injection barrier also evidented by impedance spectroscopy that the real impedance of the TFSA doped PCDTBT solar cell decreases more than 50%. Using the molecular doping approach, the overall power conversion efficiency (PCE) was largely increased from 4.70% to 5.98%. Our results suggest that TFSA functions not only as a surface doping molecule, but also an anode interfacial layer to replace the conventional PEDOT:PSS.

Research Area(s)

  • Charge injection, Interlayer, Molecular doping, OPVs

Citation Format(s)

TFSA doped interlayer for efficient organic solar cells. / Xiao, Yubin; Zhou, Shuang; Su, Yaorong; Ye, Lei; Tsang, Sai-Wing; Xie, Fangyan; Xu, Jianbin.

In: Organic Electronics: physics, materials, applications, Vol. 15, No. 12, 12.2014, p. 3702-3709.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review