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

Younjoo Lee, Hyunbok Lee, Soohyung Park, Yeonjin Yi

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17 Citations (Scopus)

Abstract

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 π 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.

Original languageEnglish
Article number233305
JournalApplied Physics Letters
Volume101
Issue number23
DOIs
Publication statusPublished - 2012 Dec 3

Bibliographical note

Funding Information:
This work was supported by Samsung Display Company, National Research Foundation (NRF) grant funded by the MEST (2012M3A7B4049801) and the KRCF through Basic Research Project managed by KRISS.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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