Liquid carbon dioxide coating of CdS quantum-dots on mesoporous TiO 2 film for sensitized solar cell applications

Wonho Jang, Eduardus Budi Nursanto, Jaehoon Kim, Se Jin Park, Byoung Koun Min, Ki Pung Yoo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

CdS quantum dots (QDs) were uniformly deposited on mesoporous TiO 2 films by high-pressure coating with liquid carbon dioxide (l-CO 2) as a coating solvent. The size and coverage of CdS QDs over the TiO 2 surface were controlled by the number of l-CO 2 coating cycles applied at a fixed precursor concentration. The formation of CdS QDs on the mesoporous TiO 2 film was confirmed by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM). In addition, depth profiling investigation revealed that CdS QDs were uniformly deposited throughout the ∼15 μm-thick mesoporous TiO 2 film. The energy conversion efficiency of a CdS QD-sensitized solar cell (QDSSC) was observed to increase up to ∼1.33% under standard conditions (1.5 AM, 100 mW cm -2) with an increase in the number of coating cycles to six. Meanwhile, a further increase in the number of coating cycles to ten caused a decrease in the cell performance, which may be attributed to the hindrance of electrolyte infiltration into the mesoporous TiO 2 electrode caused by the blocking of the pores with the coated CdS. The cell performance of the l-CO 2-coated CdS-QDSSC is slightly higher than that of the l-CO 2-coated CdS-QDSSC prepared by a conventional successive ionic layer absorption and reaction (SILAR) method with ethanol as the solvent (1.16%).

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalJournal of Supercritical Fluids
Volume70
DOIs
Publication statusPublished - 2012 Oct 1

Fingerprint

Carbon Dioxide
Semiconductor quantum dots
carbon dioxide
Carbon Monoxide
Carbon dioxide
Solar cells
solar cells
quantum dots
coatings
Coatings
Liquids
liquids
cycles
Depth profiling
energy conversion efficiency
infiltration
High resolution transmission electron microscopy
cells
Energy conversion
Infiltration

Keywords

  • CdS
  • Coating
  • Liquid carbon dioxide
  • Quantum dot
  • Sensitized solar cells

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Liquid carbon dioxide coating of CdS quantum-dots on mesoporous TiO 2 film for sensitized solar cell applications. / Jang, Wonho; Nursanto, Eduardus Budi; Kim, Jaehoon; Park, Se Jin; Min, Byoung Koun; Yoo, Ki Pung.

In: Journal of Supercritical Fluids, Vol. 70, 01.10.2012, p. 40-47.

Research output: Contribution to journalArticle

Jang, Wonho ; Nursanto, Eduardus Budi ; Kim, Jaehoon ; Park, Se Jin ; Min, Byoung Koun ; Yoo, Ki Pung. / Liquid carbon dioxide coating of CdS quantum-dots on mesoporous TiO 2 film for sensitized solar cell applications. In: Journal of Supercritical Fluids. 2012 ; Vol. 70. pp. 40-47.
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AB - CdS quantum dots (QDs) were uniformly deposited on mesoporous TiO 2 films by high-pressure coating with liquid carbon dioxide (l-CO 2) as a coating solvent. The size and coverage of CdS QDs over the TiO 2 surface were controlled by the number of l-CO 2 coating cycles applied at a fixed precursor concentration. The formation of CdS QDs on the mesoporous TiO 2 film was confirmed by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM). In addition, depth profiling investigation revealed that CdS QDs were uniformly deposited throughout the ∼15 μm-thick mesoporous TiO 2 film. The energy conversion efficiency of a CdS QD-sensitized solar cell (QDSSC) was observed to increase up to ∼1.33% under standard conditions (1.5 AM, 100 mW cm -2) with an increase in the number of coating cycles to six. Meanwhile, a further increase in the number of coating cycles to ten caused a decrease in the cell performance, which may be attributed to the hindrance of electrolyte infiltration into the mesoporous TiO 2 electrode caused by the blocking of the pores with the coated CdS. The cell performance of the l-CO 2-coated CdS-QDSSC is slightly higher than that of the l-CO 2-coated CdS-QDSSC prepared by a conventional successive ionic layer absorption and reaction (SILAR) method with ethanol as the solvent (1.16%).

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