TY - JOUR
T1 - Structure/function relationships in dyes for solar energy conversion
T2 - a two-atom change in dye structure and the mechanism for its effect on cell voltage
AU - O'Regan, Brian C.
AU - Walley, Kate
AU - Juozapavicius, Mindaugas
AU - Anderson, Assaf
AU - Matar, Farah
AU - Ghaddar, Tarek
AU - Zakeeruddin, Shaik M.
AU - Klein, Cedric
AU - Durrant, James R.
PY - 2009/3/18
Y1 - 2009/3/18
N2 - Recombination between injected electrons and iodine limits the photovoltage in dye-sensitized solar cells (DSSCs). We have recently suggested that many new dye molecules, intended to improve DSSCs, can accelerate this reaction, negating the expected improvement (J. Am. Chem. Soc. 2008, 130, 2907). Here we study two dyes with only a two-atom change in the structure, yet which give different ∨oc. Using a range of measurements we show conclusively that the change in ∨oc is due solely to the increase in the recombination rate. From the structure of the dyes, and literature values for iodine binding of similar compounds, we find that it is very likely that the change in ∨oc is due solely to the difference in iodine binding at the site of the two-atom change. Using the large amount of literature on iodine complexation, we suggest structures for dyes that might show improved ∨oc.
AB - Recombination between injected electrons and iodine limits the photovoltage in dye-sensitized solar cells (DSSCs). We have recently suggested that many new dye molecules, intended to improve DSSCs, can accelerate this reaction, negating the expected improvement (J. Am. Chem. Soc. 2008, 130, 2907). Here we study two dyes with only a two-atom change in the structure, yet which give different ∨oc. Using a range of measurements we show conclusively that the change in ∨oc is due solely to the increase in the recombination rate. From the structure of the dyes, and literature values for iodine binding of similar compounds, we find that it is very likely that the change in ∨oc is due solely to the difference in iodine binding at the site of the two-atom change. Using the large amount of literature on iodine complexation, we suggest structures for dyes that might show improved ∨oc.
UR - http://www.scopus.com/inward/record.url?scp=68149124873&partnerID=8YFLogxK
U2 - 10.1021/ja806869x
DO - 10.1021/ja806869x
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AN - SCOPUS:68149124873
SN - 0002-7863
VL - 131
SP - 3541
EP - 3548
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 10
ER -