Investigation on the Interface Modification of TiO2 Surfaces by Functional Co-Adsorbents for High-Efficiency Dye-Sensitized Solar Cells.

Abstract

The influence of interface modification of sensitized TiO2 surfaces by co-adsorbents on photovoltaic performance is detailed. We investigated different functional groups of co-adsorbents, such as carboxylic (4-guanidino butyric acid, chenodeoxycholic acid), phosphinic (dineohexyl phosphinic acid), and phosphonic (dodecyl phosphonic acid), to better highlight their influence on the device performance and accurately classify them into de-aggregating agents or agents with both de-aggregating and co-adsorbing properties. By optimizing the type of co-adsorbent and its concentration in the dye solution, we reached an efficiency of 11.0 % using 4-guanidino butyric acid or dineohexyl phosphinic acid, compared to 10.6 % when the benchmark chenodeoxycholic acid was used. The presence of co-adsorbents on the TiO2 surface was studied using ATR-FTIR spectroscopy. The role of these co-adsorbents on the band edge shift versus the recombination resistance is discussed.

DOI: 10.1002/cphc.201700486

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Cite this paper

@article{Chandiran2017InvestigationOT, title={Investigation on the Interface Modification of TiO2 Surfaces by Functional Co-Adsorbents for High-Efficiency Dye-Sensitized Solar Cells.}, author={Aravind Kumar Chandiran and Shaik Mohammed Zakeeruddin and Robin Humphry-Baker and Mohammad Khaja Nazeeruddin and Michael Gr{\"a}tzel and Frederic Sauvage}, journal={Chemphyschem : a European journal of chemical physics and physical chemistry}, year={2017}, volume={18 19}, pages={2724-2731} }