Uniform Decoration of Linker-Free Quantum Dots onto Mesoporous TiO2 Using Liquid Carbon Dioxide

Title
Uniform Decoration of Linker-Free Quantum Dots onto Mesoporous TiO2 Using Liquid Carbon Dioxide
Authors
장원호김대진김재훈민병권유기풍
Keywords
Supercritical Fluids; Quantum Dots; Solar Cell
Issue Date
2010-08
Publisher
Chemistry of materials
Citation
VOL 22, NO 15, 4350-4352
Abstract
In conclusion, we successfully demonstrated that stoichiometric CuS, PbS, or CdS QDs can be deposited uniformly throughout the mesoporous TiO2 film by coating the metal chalcogenide precursors dissolved in l-CO2 followed by reacting the absorbed precursors with H2S gas. The extremely low surface tension and the low viscosity of l-CO2 resulted in a uniform concentration profile of the QDs throughout themesoporous TiO2 film with 15 μmthickness. The size of the QDs was 2.5-4.5 nm in diameter. Thus, it is possible to overcome one of the major barriers to achieving highly efficient QDSSCs, uniform deposition of QDs onto the meso/nanostructured oxide film, by using the l-CO2 coating and the subsequent reaction technique.
URI
http://pubs.kist.re.kr/handle/201004/37763
ISSN
0897-4756
Appears in Collections:
KIST Publication > Article
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