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Reverse electron transfer at the interface of semiconductor film in dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
29038 44113 2006 8 PDF Available
Title
Reverse electron transfer at the interface of semiconductor film in dye-sensitized solar cells
Abstract

The photovoltaic performance of dye-sensitized solar cells (DSCs) based on nanocrystalline TiO2 films with co-absorbed [NBu4]2[cis-Ru(Hdcbiq)2(NCS)2] (BQ; [NBu4]+ = tetrabutyl ammonium cation; H2dcbiq = 4,4′-dicarboxy-2,2′-biquinoline) and [NBu4]2[cis-Ru(Hdcbpy)2(NCS)2] (N719; H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) has been investigated. The excited state (Eox*) of BQ is more positive than that of N719 and is comparable to the conduction band edge (Ecb) of the TiO2. The short circuit photocurrent density (Jsc) and open circuit photovoltage (Voc) decreased with increasing adsorbed BQ on the TiO2 when N719 and BQ were co-adsorbed on the TiO2. The dark current of DSCs with co-absorbed BQ and N719 increased with increasing adsorbed BQ on the TiO2. Therefore, we propose that an electron injected from N719 to TiO2 and then trapped by BQ subsequently reacted with I2. The photovoltaic performance of DSCs with co-adsorbed N719 and BQ can be explained by reverse electron transfer from TiO2 to I2 through BQ.

Keywords
Dye-sensitized solar cell; Ruthenium complex; Nanocrystalline TiO2; Reverse electron transfer; Electron transport
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 182, Issue 3, 10 September 2006, Pages 288–295
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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