2004 Fiscal Year Final Research Report Summary
Elucidation of electrical conductivity of DNA polyion-complexes and the applications for optoelectronic devices
| Project/Area Number |
15350138
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer/Textile materials
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| Research Institution | Chitose Institute of Science and Thchnology |
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Principal Investigator |
IMAI Toshiro Chitose Institute of Science and Technology, Department of Photonics Materials Science, Associate Professor, 光科学部, 助教授 (80184802)
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| Co-Investigator(Kenkyū-buntansha) |
ADACHI Chihaya Chitose Institute of Science and Thchnology, Department of Photonics Materials Science, Professor, 光科学部, 教授 (30283245)
KOYAMA Tamami Showa Denko KK, Principle researcher, 研究開発センター, 主席研究員
SASABE Hiroyuki Chitose Institute of Science and Thchnology, Department of Photonics Materials Science, Professor, 光科学部, 学長(教授) (20015126)
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| Project Period (FY) |
2003 – 2004
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| Keywords | DNA / Conductivity / DNA-CTMA / OLED / Time of Flight / Mobility |
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| Research Abstract |
DNA forms a double helix structure that contains four bases (adenine (A), cytosine (C), guanine (G), and thymine (T). It is basically an abundance of πelectrons. Because a regular sequence of the four bases in DNA can be assumed to be a conducting wire, we can create novel electronic device applications with advanced functions using DNA as an electrically active material.
In this study, we evaluated fundamental conductivity of the DNA-CTMA thin film. The J-V characteristics of DNA-CTMA single and double layer devices combined with unipolar hole (TPD) and electron (POXD) transport layers clearly demonstrated electrical conductivity of DNA-CTMA. We observed that the current density of J=590mA/cm^2 with the DNA-CTMA single layer device, J=11mA/cm^2 with the DNA-CTMA double layer device combined with TPD and J=0.02mA/cm^2 with the DNA-CTMA double layer device combined with POXD at an applied voltage of 10V. These results clearly suggest that the DNA-CTMA layer basically has bipolar carrier transport characteristics.
We further evaluated fundamental conductivity of the vacuum deposited thin films of the four bases. We observed that the current density of J=180mA/cm^2 with Adenine, J=0.35mA/cm^2 with Cytosine, J=10mA/cm^2 with Guanine and J=2.3mA/cm^2 with Thymine at an applied voltage of 10V. Further, we confirmed charge carrier transport characteristics of the four bases by using them in electrophosphorescence OLEDs. Theη_<ext>-J characteristics of OLEDs with four bases as HTL were investigated. Adenine, Cytosine and Guanine as HTL demonstrated maximumη_<ext>〜8.0±0.2% demonstrating that the vacuum deposited films of the four bases are useful as a HTL in OLED.
Our results dearly demonstrated that DNA double helix intrinsically have semiconducting characteristics and the DNA-CTMA and the vacuum deposited base films have potential for semiconductor applications.
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Research Products
(2 results)
