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Title: Energy level alignment at the interfaces between typical electrodes and nucleobases: Al/adenine/indium-tin-oxide and Al/thymine/indium-tin-oxide

We investigated the interfacial electronic structures of Al/adenine/indium-tin-oxide (ITO) and Al/thymine/ITO using in situ ultraviolet and x-ray photoemission spectroscopy and density functional theory calculations. Adenine shows both an interface dipole and level bending, whereas thymine shows only an interface dipole in contact with ITO. In addition, thymine possesses a larger ionization energy than adenine. These are understood with delocalized {pi} states confirmed with theoretical calculations. For the interface between nucleobases and Al, both nucleobases show a prominent reduction of the electron injection barrier from Al to each base in accordance with a downward level shift.
Authors:
; ; ;  [1]
  1. Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemoon-gu, Seoul 120-749 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22089584
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 101; Journal Issue: 23; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ADENINES; ALUMINIUM; DENSITY FUNCTIONAL METHOD; DIPOLES; ELECTRODES; ELECTRON BEAM INJECTION; INDIUM ADDITIONS; INTERFACES; IONIZATION; PHOTOEMISSION; SEMICONDUCTOR MATERIALS; THYMINE; TIN OXIDES; ULTRAVIOLET RADIATION; X RADIATION; X-RAY PHOTOELECTRON SPECTROSCOPY