Quantitative Evaluation of Electron Injection Efficiency in Dye-Sensitized TiO2 Films

Quantitative Evaluation of Electron Injection Efficiency in Dye-Sensitized TiO2 Films

The efficiency of electron injection (Φinj) in dye-sensitized nanocrystalline films was studied through transient absorption (TA) and time-resolved microwave conductivity (TRMC) measurements. Here, I show the absolute value of Φinj for several dye-sensitized nanocrystalline films and discuss the rel...

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Veröffentlicht in:Ambio 2012-03, Vol.41 (Suppl 2), p.143-148
1. Verfasser: Katoh, Ryuzi
Format: Artikel
Sprache:eng
Schlagworte:
absorption
Absorption spectra
Absorption spectroscopy
Atmospheric Sciences
Dyes
Earth and Environmental Science
Ecology
Electrolytes
Electron transfer
Electrons
Environment
Environmental Engineering/Biotechnology
Environmental Management
Free energy
Injection
Microwaves
Nanocrystals
Photovoltaic cells
Physical chemistry
Physical Geography
Semiconducting films
Solar cells
Solar energy
Spectrum analysis
Titanium dioxide
Wavelengths
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Zusammenfassung:The efficiency of electron injection (Φinj) in dye-sensitized nanocrystalline films was studied through transient absorption (TA) and time-resolved microwave conductivity (TRMC) measurements. Here, I show the absolute value of Φinj for several dye-sensitized nanocrystalline films and discuss the relationship between Φinj and the free energy change (−ΔG inj) for the injection process. Some systems exhibited lower Φinj values even when −ΔG inj was sufficiently large to promote electron injection. Recent experimental findings are used to propose possible explanations for this phenomenon. Quantitative evaluation of Φinj using TA and TRMC will give us new insights for developing high-performance solar cell devices.
ISSN:0044-7447
1654-7209
DOI:10.1007/s13280-012-0277-2