Multi-functionality of macroporous tiO2 spheres in dye-sensitized and hybrid heterojunction solar cells

Ganapathy Veerappan, Dae Woong Jung, Jeong Kwon, Jeong Mo Choi, Nansra Heo, Gi Ra Yi, Jong Hyeok Park

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Micron-sized macroporous TiO2 spheres (MAC-TiO2) were synthesized using a colloidal templating process inside emulsions, which were then coated on a nanocrystalline TiO2 light absorption film to prepare a bilayered photoanode for liquid-based dye-sensitized solar cells (DSSC) and hybrid heterojunction solid-state solar cells. MAC-TiO2 layers can enhance light scattering as well as absorption, because their pore size and periodicity are comparable to light wavelength for unique multiple scattering and a porous surface can load dye more. Moreover, due to the bicontinuous nature of macropores and TiO2 walls, electrolyte could be transported much faster in between the TiO2 spheres rather than within the small TiO2 nonporous architectures. Electron transport was also facilitated along the interconnected TiO2 walls. In DSSCs with these MAC-TiO2 scattering layers, efficiency was higher than conventional DSSCs incorporating a commercial scattering layer. The unique geometry of MAC-TiO2 results in strong improvements in light scattering and infiltration of hole-transporting materials, thereby the MAC-TiO2-based solid-state device showed comparatively higher efficiency than the device with conventional nanocrystalline TiO2.

Original languageEnglish
Pages (from-to)3010-3018
Number of pages9
JournalLangmuir
Volume30
Issue number11
DOIs
Publication statusPublished - 2014 Mar 25

Fingerprint

Heterojunctions
heterojunctions
Solar cells
Coloring Agents
Dyes
solar cells
dyes
electromagnetic absorption
Light scattering
light scattering
scattering
Scattering
Solid state devices
solid state devices
Multiple scattering
infiltration
Emulsions
Infiltration
Light absorption
Electrolytes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Veerappan, Ganapathy ; Jung, Dae Woong ; Kwon, Jeong ; Choi, Jeong Mo ; Heo, Nansra ; Yi, Gi Ra ; Park, Jong Hyeok. / Multi-functionality of macroporous tiO2 spheres in dye-sensitized and hybrid heterojunction solar cells. In: Langmuir. 2014 ; Vol. 30, No. 11. pp. 3010-3018.
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Multi-functionality of macroporous tiO2 spheres in dye-sensitized and hybrid heterojunction solar cells. / Veerappan, Ganapathy; Jung, Dae Woong; Kwon, Jeong; Choi, Jeong Mo; Heo, Nansra; Yi, Gi Ra; Park, Jong Hyeok.

In: Langmuir, Vol. 30, No. 11, 25.03.2014, p. 3010-3018.

Research output: Contribution to journalArticle

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