| 학회 |
한국재료학회 |
| 학술대회 |
2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 |
19권 2호 |
| 발표분야 |
C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 |
Visible light absorption in carbon doped TiO2 nanotube arrays |
| 초록 |
The nanoscale oxide semiconductors are used for various applications. Among many metal oxides fabricated in nm scale, particularly TiO2 has attracted a great interest for optically functional devices such as solar cell, photocatalysis, and optical sensor. The multiple advantages of TiO2 are environment friendly, ambient-stable, cheap and non-toxic. It was established that TiO2 nanotube arrays (TNTAs) with the large surface area can be made by anodization method feasibly. However, tuning of electronic structure of TNTA is needed for the improved visible light absorption but the uniform and easy doping technique to TNTA is very challenging. In this presentation, we report that visible absorption in TNTA significantly increases with carbon doping by quick-term anneal process on TNTAs surface, resulting in the surface bandgap tuning. The doping of carbon to TNTA surface reduces its band gap to 1.7 eV from 3.2 eV. XPS analysis confirms the carbon existence at the interstitial or substitutional of TiO2 lattice, which forms the localized energy state in bandgap. This bandgap reduction gives a rise to the increased visible absorption at 400~700 nm of wavelength by 350% against the undoped TNTA. |
| 저자 |
이영안1, 이미경1, Sajith Kurian2, 전형탁2, 서형탁1
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| 소속 |
1아주대, 2한양대 |
| 키워드 |
TiO2 nanotube; solar cell; anodization; bandgap tuning; oxide semiconductor
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| E-Mail |
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