| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
G. 나노/박막 재료 분과 |
| 제목 |
Multipurpose and modifiable Electrical Properties of Doped Defect Free Graphene Flakes Using Alkali Metal Chlorides |
| 초록 |
With the quick growth of wearable and flexible devices, graphene has been intensively studied for the transparent, hole transport electrode layer (HTL) of field-effect transistors, light-emitting diodes, and organic photovoltaic (OPV) cells. To regulate the sheet resistance and the work function of graphene as a HTL, the surface doping is multipurpose while maintaining high transparency. In this work, we used a chemical doping method to control the charge carrier density, band gap, and work function of graphene with minimizing the damage of the carbon network, for which metal chlorides (NaCl, KCl, and AuCl3) were used as chemical dopants. The high-quality graphene flakes were produced with large length and width sizes of more than 5 μm using ternary graphite intercalation compounds. Interestingly, the AuCl3-doped graphene flake film with a film thickness of about 20 nm showed the lowest reported sheet resistance of ∼249 Ω/sq with ∼75% transmittance. Furthermore, it could control the work function from 4.32 to 5.1 eV. The interfacial dipole complexes of metal cations with a low work function and the reactive radicals such as −OH were discussed to explain this result. For the practical application, an OPV device using the AuCl3-doped graphene flake film as the HTL was fabricated and it demonstrated enhanced power conversion fficiency while maintaining high optical transparency in visible light. |
| 저자 |
Junyong Yang1, Bo Hyun Kim2, Kwang Hyun Park3, Chengai Li4, Nam Chul Kim1, Kwang Young Jeong2, Sung Ho Song3
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| 소속 |
1Division of Advanced Materials Engineering, 2Kongju National Univ., 3Chungnam, 4Republic of Korea |
| 키워드 |
Graphene; chemical doping; electrical conductivity; work function; transparent electrode
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| E-Mail |
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