We report a new class of molecular insulators that electronically passivate the surface of nanocrystalline titania films for high performance dye sensitized solar cells (DSC). Using electrical impedance measurements we demonstrate that co-adsorption of dineohexyl bis-(3,3-dimethyl-butyl)-phosphinic acid (DINHOP), along with the amphiphilic ruthenium sensitizer Z907Na increased substantially the power output of the cells mainly due to a retardation of interfacial recombination of photo-generated charge carriers. The use of phosphinates as anchoring groups opens up new avenues for modification of the surface by molecular insulators, sensitizers and other electro-active molecules to realize the desired optoelectronic performance of devices based on oxide junctions. © 2009 The Royal Society of Chemistry.
|Original language||English (US)|
|State||Published - 2009|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the Stanford University KAUST center of Excellency and a grant from the United State Airforce. X. Li thanks the Chinese National Natural Science Foundation (50672041) for a grant to support a 6 months leave at the EPFL during which time his contribution to this work was performed. We thank Dr. Robin Humphry-Baker for fruitful discussions and Pascal Comte for the TiO2 film preparations.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.