Controlled p-doping of zinc phthalocyanine by coevaporation with tetrafluorotetracyanoquinodimethane: A direct and inverse photoemission study

Weiying Gao, Antoine Kahn

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295 Scopus citations

Abstract

P-doping of zinc phthalocyanine (ZnPc) with tetrafluorotetracyanoquinodimethane (F4-TCNQ) is investigated with ultraviolet and x-ray photoemission spectroscopy, inverse photoemission spectroscopy, and in situ current-voltage (I-V) measurements. The electron affinity of F4-TCNQ (5.24 eV) is found to be equal, within experimental error, to the ionization energy of ZnPc (5.28 eV), consistent with efficient host-to-dopant electron transfer. As a result, the Fermi level in doped ZnPc drops from near midgap to 0.18 eV above the leading edge of the highest occupied molecular orbital and a narrow space-charge layer (<32 Å) is formed at the interface with the Au substrate. In situ I-V measurements show a seven orders of magnitude doping-induced increase in hole current.

Original languageEnglish (US)
Pages (from-to)4040-4042
Number of pages3
JournalApplied Physics Letters
Volume79
Issue number24
DOIs
StatePublished - Dec 10 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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