염료감응 태양전지의 전극 물질로 금속산화물인 이산화티타늄$(TiO_2)$를 사용하고, 감응제로 malachite green oxalate, basic blue3, rhodamine B, bromocresol purple 염료를 사용할 때 광전환 효율을 높이고 안정성을 향상시키기 위하여 갖추어야될 염료의 전기화학적 특성과 분광학적 특성을 조사하였다. 기준전극에 대한 염료의 산화전위와 흡수파장을 전자볼트 단위로 환산한 값을 더하여 들뜬 상태를 얻었다. $TiO_2$전극의 평활전위$(E_{fb})$를 결정하여 전도띠 끝 준위$(E_{c,s})$를 계산하였으며, 이를 염료의 들뜬 상태와 비교함으로써 합선 전류$(J_{sc})$를 향상시킬 수 있도록 염료가 갖추어야 할 특성을 알아내었다. 또한 폴리피롤전도성 고분자를 입혀 $TiO_2$의 결함자리에서 전도띠에 있는 전자가 산화된 염료와 재결합하는 것과 $TiO_2$필름의 균열에 의한 염료의 전극반응을 방지함으로써 광전류의 안정성을 향상시킨 결과를 얻었다.
염료감응 태양전지의 전극 물질로 금속산화물인 이산화티타늄$(TiO_2)$를 사용하고, 감응제로 malachite green oxalate, basic blue3, rhodamine B, bromocresol purple 염료를 사용할 때 광전환 효율을 높이고 안정성을 향상시키기 위하여 갖추어야될 염료의 전기화학적 특성과 분광학적 특성을 조사하였다. 기준전극에 대한 염료의 산화전위와 흡수파장을 전자볼트 단위로 환산한 값을 더하여 들뜬 상태를 얻었다. $TiO_2$전극의 평활전위$(E_{fb})$를 결정하여 전도띠 끝 준위$(E_{c,s})$를 계산하였으며, 이를 염료의 들뜬 상태와 비교함으로써 합선 전류$(J_{sc})$를 향상시킬 수 있도록 염료가 갖추어야 할 특성을 알아내었다. 또한 폴리피롤 전도성 고분자를 입혀 $TiO_2$의 결함자리에서 전도띠에 있는 전자가 산화된 염료와 재결합하는 것과 $TiO_2$필름의 균열에 의한 염료의 전극반응을 방지함으로써 광전류의 안정성을 향상시킨 결과를 얻었다.
A solar cell based on dye-sensitized photoelectric conversion was studied by electrochemical and spec-trofluorometric methods for the purposes of enhancing its efficiency and stability of $TiO_2$ solar cells. Nanocrystalline $TiO_2$ was used to prepare photoelectrodes, and phot...
A solar cell based on dye-sensitized photoelectric conversion was studied by electrochemical and spec-trofluorometric methods for the purposes of enhancing its efficiency and stability of $TiO_2$ solar cells. Nanocrystalline $TiO_2$ was used to prepare photoelectrodes, and photosensitizing dyes such as malachite green oxalate, basic blue3, rhodamine B, and bromocresol purple were chosen as sensitizers. Electrochemical oxidation potentials and absorption and emission wavelengths of dyes were used to determine energy levels of the dyes. By comparing excited energy levels of the dyes with the conduction band edge potential $(E_{c,s})\;of\;TiO_2$ calculated by using the flat-band potential $(E_{fb})\;of\;TiO_2$, properties of a dye required to fabricate a high efficient photosensitizing solar cell with high short-circuit current $(J_{sc})$ were suggested. Enhanced stability of photocurrent was obtained by coating a $TiO_2|ITO$ electrode with Polypyrrole that Possibly Prevented the recombination between the conduction band electrons and oxidized dyes and suppressed the direct electrode redox reactions of dyes on ITO.
A solar cell based on dye-sensitized photoelectric conversion was studied by electrochemical and spec-trofluorometric methods for the purposes of enhancing its efficiency and stability of $TiO_2$ solar cells. Nanocrystalline $TiO_2$ was used to prepare photoelectrodes, and photosensitizing dyes such as malachite green oxalate, basic blue3, rhodamine B, and bromocresol purple were chosen as sensitizers. Electrochemical oxidation potentials and absorption and emission wavelengths of dyes were used to determine energy levels of the dyes. By comparing excited energy levels of the dyes with the conduction band edge potential $(E_{c,s})\;of\;TiO_2$ calculated by using the flat-band potential $(E_{fb})\;of\;TiO_2$, properties of a dye required to fabricate a high efficient photosensitizing solar cell with high short-circuit current $(J_{sc})$ were suggested. Enhanced stability of photocurrent was obtained by coating a $TiO_2|ITO$ electrode with Polypyrrole that Possibly Prevented the recombination between the conduction band electrons and oxidized dyes and suppressed the direct electrode redox reactions of dyes on ITO.
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