A photoemission study of interfaces between organic semiconductors and Co as well as Al2O3/Co contacts

M. Grobosch; C. Schmidt; W.J.M. Naber; Wilfred Gerard van der Wiel; M. Knupfer

doi:10.1016/j.synthmet.2009.09.014

A photoemission study of interfaces between organic semiconductors and Co as well as Al₂O₃/Co contacts

M. Grobosch, C. Schmidt, W.J.M. Naber, Wilfred Gerard van der Wiel, M. Knupfer

Research output: Contribution to journal › Article › Academic › peer-review

15 Citations (Scopus)

Abstract

We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission spectroscopy. Our results demonstrate that the work function under these conditions is smaller than in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy measurements rule out chemical reactions.

Original language	Undefined
Pages (from-to)	238-243
Number of pages	6
Journal	Synthetic metals
Volume	160
Issue number	3-4
DOIs	https://doi.org/10.1016/j.synthmet.2009.09.014
Publication status	Published - Feb 2010

Keywords

EWI-19217
Spintronics
Pentacene
METIS-275825
IR-75547
Energy-level alignment
Rubrene
Photoemission spectroscopy

Access to Document

10.1016/j.synthmet.2009.09.014

http://eprints.eemcs.utwente.nl/secure2/19217/01/Grobosch_Synth__Metals_(2010)_-_A_photoemission_study_of_interfaces_between_organic_semiconductors_and_Co_as_well_as_Al2O3-Co_contacts.pdf

Cite this

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title = "A photoemission study of interfaces between organic semiconductors and Co as well as Al2O3/Co contacts",

abstract = "We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission spectroscopy. Our results demonstrate that the work function under these conditions is smaller than in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy measurements rule out chemical reactions.",

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author = "M. Grobosch and C. Schmidt and W.J.M. Naber and {van der Wiel}, {Wilfred Gerard} and M. Knupfer",

note = "10.1016/j.synthmet.2009.09.014 ",

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T1 - A photoemission study of interfaces between organic semiconductors and Co as well as Al2O3/Co contacts

AU - Grobosch, M.

AU - Schmidt, C.

AU - Naber, W.J.M.

AU - van der Wiel, Wilfred Gerard

AU - Knupfer, M.

N1 - 10.1016/j.synthmet.2009.09.014

PY - 2010/2

Y1 - 2010/2

N2 - We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission spectroscopy. Our results demonstrate that the work function under these conditions is smaller than in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy measurements rule out chemical reactions.

AB - We have studied the energy-level alignment of ex situ, acetone cleaned Co and Al2O3/Co contacts to the organic semiconductors pentacene and rubrene by combined X-ray and ultraviolet photoemission spectroscopy. Our results demonstrate that the work function under these conditions is smaller than in the in situ cleaned, atomically clean case. Moreover, the studied interfaces are characterized by very small, short range interfaces dipoles and substantial injection barriers for holes. This represents essential information in view of their use in organic spintronic devices. Our core-level photoemission spectroscopy measurements rule out chemical reactions.

KW - EWI-19217

KW - Spintronics

KW - Pentacene

KW - METIS-275825

KW - IR-75547

KW - Energy-level alignment

KW - Rubrene

KW - Photoemission spectroscopy

U2 - 10.1016/j.synthmet.2009.09.014

DO - 10.1016/j.synthmet.2009.09.014

M3 - Article

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EP - 243

JO - Synthetic metals

JF - Synthetic metals

SN - 0379-6779

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