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Investigation on the Interface Modification of TiO 2 Surfaces by Functional Co‐Adsorbents for High‐Efficiency Dye‐Sensitized Solar Cells
Author(s) -
Chandiran Aravind Kumar,
Zakeeruddin Shaik M.,
HumphryBaker Robin,
Nazeeruddin Mohammad Khaja,
Grätzel Michael,
Sauvage Frédéric
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201700486
Subject(s) - adsorption , chenodeoxycholic acid , butyric acid , chemistry , surface modification , fourier transform infrared spectroscopy , dye sensitized solar cell , chemical engineering , carboxylic acid , nuclear chemistry , inorganic chemistry , organic chemistry , biochemistry , electrode , engineering , electrolyte , cholesterol
The influence of interface modification of sensitized TiO 2 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 TiO 2 surface was studied using ATR‐FTIR spectroscopy. The role of these co‐adsorbents on the band edge shift versus the recombination resistance is discussed.