Direct determination of the electronic structure of the poly(3-hexylthiophene):phenyl-[6,6]-C61 butyric acid methyl ester blend

Ze Lei Guan, Jong Bok Kim, He Wang, Cherno Jaye, Daniel A. Fischer, Yueh Lin Loo, Antoine Kahn

Research output: Contribution to journalArticle

184 Citations (Scopus)

Abstract

This article focuses on the electronic structure of the poly(3-hexylthiophene):phenyl-[6,6]-C61 butyric acid methyl ester (P3HT:PCBM) blend, widely used in bulk heterojunction (BHJ) solar cells. Given the fact that the surface of the blend film is a nearly pure P3HT wetting layer, we use a lift-off method to access the originally buried surface, which is rich in both P3HT and PCBM and thus representative of the BHJ. The combination of direct and inverse photoemission spectroscopy on this surface leads to a determination of the energy gap between the lowest unoccupied molecular orbital (LUMO) of the acceptor and the highest occupied molecular orbital (HOMO) of the donor. The gap is ∼1.4 eV, which implies a 0.5-0.6 eV interface dipole barrier between the two materials. The energy gap is found to be stable versus in situ annealing up to 100 °C.

Original languageEnglish (US)
Pages (from-to)1779-1785
Number of pages7
JournalOrganic Electronics: physics, materials, applications
Volume11
Issue number11
DOIs
StatePublished - Nov 1 2010
Externally publishedYes

Fingerprint

Butyric acid
butyric acid
Electronic structure
esters
Esters
Molecular orbitals
electronic structure
Heterojunctions
heterojunctions
molecular orbitals
Energy gap
Photoelectron spectroscopy
wetting
Wetting
Solar cells
photoelectric emission
solar cells
Annealing
dipoles
annealing

Keywords

  • Blend
  • Bulk heterojunction
  • Electronic structure
  • Interface dipole
  • P3HT
  • PCBM

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Direct determination of the electronic structure of the poly(3-hexylthiophene):phenyl-[6,6]-C61 butyric acid methyl ester blend. / Guan, Ze Lei; Kim, Jong Bok; Wang, He; Jaye, Cherno; Fischer, Daniel A.; Loo, Yueh Lin; Kahn, Antoine.

In: Organic Electronics: physics, materials, applications, Vol. 11, No. 11, 01.11.2010, p. 1779-1785.

Research output: Contribution to journalArticle

Guan, Ze Lei ; Kim, Jong Bok ; Wang, He ; Jaye, Cherno ; Fischer, Daniel A. ; Loo, Yueh Lin ; Kahn, Antoine. / Direct determination of the electronic structure of the poly(3-hexylthiophene):phenyl-[6,6]-C61 butyric acid methyl ester blend. In: Organic Electronics: physics, materials, applications. 2010 ; Vol. 11, No. 11. pp. 1779-1785.
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