• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.68.2-68.2
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• 2010

Dye-sensitized solar cells (DSSC) show great promise as an inexpensive alternative to conventional p-n junction solar cells. Investigations into the various factors influencing the photovoltaic efficiency have recently been intensified. The conventional absorber electrode in DSSC is composed of compacted or sintered $TiO_2$ nanopowder that carries an anchored organic dye. The absorbance of incident light in the DSC is realized by specifically engineered dye molecules placed on the semiconductor electrode surface ($TiO_2$). The dye absorbs light at wavelengths up to about 920nm, the energy of the exited state of the molecule should be about 1.35eV above the electronic ground state corresponding to the ideal band gap of a single band gap solar cell. The dye molecules ar adhered onto the nanostrutured $TiO_2$ electrode by immersing the sintered electrode into a dye solution, typically 3mM in alcohol, for a long enough period to fully impregnate the electrode. However, the concentrations of the dye is slightly changed due to the evaporation of the alcohol. The dye is more expensive than other materials in DSSC and related to the efficiency of DSSC. Therefore, the concentrations of the dye should be carefully measured. In this study, we investigated to the dye loading on fired $TiO_2$ powder as a function of temperature by the TG-DTA and the dye solution by UV-visible spectroscopy after the impregnation process. The dye loading is related to the porosity of the nanostructured $TiO_2$ electrode.

• 한국진공학회지
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• 제19권5호
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• pp.377-384
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• 2010

본 연구에서는 수직 가열로(vertical furnace)를 이용하여 $1150^{\circ}C$의 온도에서 섬유형태의 고순도 단일벽 탄소나노튜브(singlewalled carbon nanotubes)를 합성하였다. 탄소나노튜브의 구조에 영향을 미치는 실험 변수인 페로센(ferrocene)의 농도, 혼합용액의 주입 속도, 싸이오펜(thiophene)의 농도, 수소($H_2$)의 주입 양을 조절하여 고순도의 단일벽 탄소나노튜브 섬유의 최적화 된 대량 합성 조건을 확립하였다. 또한 각 요인들이 탄소나노튜브의 생성에 미치는 영향에 대해 논의하였다. 분석 결과, 최적화 된 조건에서 1.16~1.64 nm의 직경을 가진 고순도의 단일벽 탄소나노튜브가 다발(bundle) 구조로 정렬되어 있음을 확인할 수 있었다.