Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 4, Issue 8, Pages 4419-4427Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am301090a
Keywords
3D TCO; 3D FTO; nanoparticles; Core-shell; conformal; DSSC
Funding
- National Science Foundation [CBET-1150617]
- NIU-Argonne Nanoscience Fellowship via InSET
- Electron Microscopy Center for Materials Research at Argonne National Laboratory, a U.S. Department of Energy Office of Science Laboratory [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science, and Office of Basic Energy Science [DE-AC02-06CH11357]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1150617] Funding Source: National Science Foundation
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The semiconducting metal oxide-based photoanodes in the most efficient dye-sensitized solar cells (DSSCs) desires a low doping level to promote charge separation, which, however, limits the subsequent electron extraction in the slow diffusion regime. These conflicts are mitigated in a new photoanode design that decouples the charge separation and extraction functions. A three-dimensional highly doped fluorinated SnO2 (FTO) nanoparticulate film serves as conductive core for low-resistance and drift-assisted charge extraction while a thin, low-doped conformal TiO2 shell maintains a large resistance to recombination (and therefore long charge lifetime). EIS reveals that the,electron transit time is reduced by orders of magnitude, whereas the recombination resistance remains in the range of traditional nanoparticle TiO2 photoeledrodes.
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