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

doi:10.1016/j.orgel.2010.07.023

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

Journal article

Peer reviewed

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 and Antoine Kahn

Organic electronics, Vol.11(11), pp.1779-1785

2010

DOI: https://doi.org/10.1016/j.orgel.2010.07.023

Abstract

Interface dipole

Electronic structure

P3HT

PCBM

Bulk heterojunction

Blend

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.

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Collaboration types: Domestic collaboration
Citation topics: 2 Chemistry; 2.114 Organic Semiconductors; 2.114.61 Organic Solar Cells
Web Of Science research areas: Materials Science, Multidisciplinary; Physics, Applied
ESI research areas: Physics

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Details

Title: Direct determination of the electronic structure of the poly(3-hexylthiophene):phenyl-[6,6]-C61 butyric acid methyl ester blend
Creators: Ze-Lei Guan - Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
Jong Bok Kim - Department of Chemical Engineering, Princeton University, Princeton, NJ 08544, USA
He Wang - Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
Cherno Jaye - Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Daniel A Fischer - Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
Yueh-Lin Loo - Department of Chemical Engineering, Princeton University, Princeton, NJ 08544, USA
Antoine Kahn - Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA
Publication Details: Organic electronics, Vol.11(11), pp.1779-1785
Publisher: Elsevier B.V
Academic Unit: College of A&S; A&S - Physics
Language: English
Resource Type: Journal article
Record Identifier: 991031561059902976