TY - JOUR
T1 - Chemistry and electronic properties of metal contacts on an organic molecular semiconductor
AU - Hirose, Y.
AU - Wu, C. I.
AU - Aristov, V.
AU - Soukiassian, P.
AU - Kahn, Antoine
N1 - Funding Information:
This work was supportedp rimarily by the MR-SEC program of the National Science Foundation under Award Number DMR-9400362. It is based in part upon research conducted at the Synchrotron Radiation Center of the University of Wisconsin in Madison, which is supportedb y the National Science Foundation (DMR-92-12652). We thank P. Burrows and S.R. Forrest for providing purified PTCDA.
PY - 1997/4
Y1 - 1997/4
N2 - This paper gives a brief review of the electronic properties of the surface of an organic molecular semiconductor, i.e. PTCDA, and of the chemical and electrical properties of its contacts with to metals, i.e. Ti and Au. The combination of direct and inverse photoemission spectroscopies demonstrates that correlation effects are small in PTCDA. Synchrotron radiation photoemission spectroscopy shows that the Ti/PTCDA interface is reacted and that chemistry-induced electronic states in the PTCDA band gap lead to an Ohmic contact. The Au/PTCDA interface, on the other hand, is unreacted and abrupt and the Au/PTCDA contact is rectifying. This duality, which applies also to other metal/PTCDA interfaces, suggests the overwhelming importance of chemistry in defining electrical properties of contacts to organic molecular thin films.
AB - This paper gives a brief review of the electronic properties of the surface of an organic molecular semiconductor, i.e. PTCDA, and of the chemical and electrical properties of its contacts with to metals, i.e. Ti and Au. The combination of direct and inverse photoemission spectroscopies demonstrates that correlation effects are small in PTCDA. Synchrotron radiation photoemission spectroscopy shows that the Ti/PTCDA interface is reacted and that chemistry-induced electronic states in the PTCDA band gap lead to an Ohmic contact. The Au/PTCDA interface, on the other hand, is unreacted and abrupt and the Au/PTCDA contact is rectifying. This duality, which applies also to other metal/PTCDA interfaces, suggests the overwhelming importance of chemistry in defining electrical properties of contacts to organic molecular thin films.
KW - Contact
KW - Organic semiconductor
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U2 - 10.1016/S0169-4332(96)00886-0
DO - 10.1016/S0169-4332(96)00886-0
M3 - Article
AN - SCOPUS:0031547186
SN - 0169-4332
VL - 113-114
SP - 291
EP - 298
JO - Applied Surface Science
JF - Applied Surface Science
ER -