2013 Fiscal Year Final Research Report
Ambipolar Carrier Injection towards organic semiconductor lasers
| Project/Area Number |
24651128
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Nanomaterials/Nanobioscience
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| Research Institution | Tohoku University |
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Principal Investigator |
TANIGAKI Katsumi 東北大学, 原子分子材料科学高等研究機構, 教授 (60305612)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 有機半導体 / M-I接合 / 仕事関数 / 両極性伝導 / 電界発光素子 |
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| Research Abstract |
The metal-semiconductor (MS) contact between a metal electrode and an organic semiconductor is generally in the Schottky limit, and the barrier height against carrier injection from an electrode is greatly dependent on the work function of the electrodes. Consequently, metals with air-unstable low workfunctions such as Ca are necessary for electron injection. Here, we report that the Schottky limit can be converted to the Bardeen limit and the carrier injection barrier height can become be independent of the electrode work function. This is exemplified using tetracontane as a surface modification layer on a SiO2 dielectric gate insulator and the unambiguously evidences are given from the experiments of temperature dependence of FETs and photoemission spectroscopy. Based on this finding we demonstrate an air-stable light-emitting organic field-effect transistor using Au electrodes for both hole and electron injection.
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Research Products
(17 results)
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[Journal Article] Theoretical Analysis on the Optoelectronic Properties of Single Crystals of Thiophene-furan-phenylene Co-Oligomers : Efficient Photoluminescence due to Molecular Bending2013
Author(s)
Hiroyuki Tamura, Ikutaro Hamada, Hui Shang, Kazuaki Oniwa, Md. Akhtaruzzaman, Tienan Jin, Naoki Asao, Yoshinori Yamamoto, hangavel Kanagasekaran, Hidekazu Shimotani, Susumu Ikeda and Katsumi Tanigaki
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Journal Title
Journal of Physical Chemistry C
Volume: 117
Pages: 8072-8078
Peer Reviewed
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