期刊
NATURE MATERIALS
卷 8, 期 8, 页码 665-671出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT2475
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资金
- Korea Institute of Science and Technology (KIST)
- Ministry of Information and Economy (MIK) [2006-N-PV12-P-05]
- Korea Science and Engineering Foundation (KOSEF) [2008-05103]
- National Research Council of Science & Technology (NST), Republic of Korea [2E20980] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2008-2000092] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although sequential adsorption of dyes in a single TiO2 electrode is ideal to extend the range of light absorption in dye-sensitized solar cells, high-temperature processing has so far limited its application. We report a method for selective positioning of organic dye molecules with different absorption ranges in a mesoporous TiO2 film by mimicking the concept of the stationary phase and the mobile phase in column chromatography, where polystyrene-filled mesoporous TiO2 film is explored for use as a stationary phase and a Bronsted-base-containing polymer solution is developed for use as a mobile phase for selective desorption of the adsorbed dye. By controlling the desorption and adsorption depth, yellow, red and green dyes were vertically aligned within a TiO2 film, which is confirmed by an electron probe micro-analyser. The external quantum efficiency (EQE) spectrum from a solar cell with three selectively positioned dyes reveals the EQE characteristics of each single-dye cell.
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