Selective positioning of organic dyes in a mesoporous inorganic oxide film

Kyungtae Lee, Se Woong Park, Min Jae Ko, Kyungkon Kim, Nam Gyu Park

Research output: Contribution to journalArticlepeer-review

244 Scopus citations

Abstract

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 Brønsted-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.

Original languageEnglish
Pages (from-to)665-671
Number of pages7
JournalNature Materials
Volume8
Issue number8
DOIs
StatePublished - Aug 2009

Bibliographical note

Funding Information:
This work was supported by the Korea Institute of Science and Technology (KIST) internal project and the Ministry of Information and Economy (MIK) new and renewable energy project under contract 2006-N-PV12-P-05. The authors also acknowledge financial support from the Pioneer Research Program of the Korea Science and Engineering Foundation (KOSEF) under contract No. 2008-05103.

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