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Determination of electron affinity of electron accepting molecules
Authors:Kaname Kanai   Kouki Akaike   Kiichirou Koyasu   Kentaro Sakai   Toshio Nishi   Yasunori Kamizuru   Tatsuhiko Nishi   Yukio Ouchi  Kazuhiko Seki
Affiliation:(1) Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan;(2) Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
Abstract:The unoccupied π * states of the solid film of electron accepting organic molecules, 7,7,8,8-tetracyanoquinodimethane (TCNQ), fluorinated TCNQ derivatives, 11,11,12,12-tetracyanonaphtho-2,6-quinodimethane (TNAP), C60, and 6,6-phenyl-C61-butyric acid methyl ester (PCBM) have been studied by inverse photoemission spectroscopy. The assignment of the π * affinity levels of these typical electron accepting molecules provides the basic information for the organic electronics and the new electronic functional molecular design. The comparison with density functional theory calculations enables understanding how the electron affinity evolves in terms of molecular orbitals. The correlation between the film morphology and the irradiation damage on the TCNQ derivative samples by electron impact during the inverse photoemission measurements is also discussed.
Keywords:  KeywordHeading"  >PACS 71.22.+1  73.20.At  79.60.Fr
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