Please use this identifier to cite or link to this item: https://doi.org/10.3390/computation1010001
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dc.titleEffect of isotopic substitution on elementary processes in dye-sensitized solar cells: Deuterated amino-phenyl acid dyes on TiO 2
dc.contributor.authorManzhos, S
dc.contributor.authorSegawa, H
dc.contributor.authorYamashita, K
dc.date.accessioned2020-10-30T02:02:24Z
dc.date.available2020-10-30T02:02:24Z
dc.date.issued2013
dc.identifier.citationManzhos, S, Segawa, H, Yamashita, K (2013). Effect of isotopic substitution on elementary processes in dye-sensitized solar cells: Deuterated amino-phenyl acid dyes on TiO 2. Computation 1 (1) : 1-15. ScholarBank@NUS Repository. https://doi.org/10.3390/computation1010001
dc.identifier.issn20793197
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/182056
dc.description.abstractWe present the first computational study of the effects of isotopic substitution on the operation of dye-sensitized solar cells. Ab initio molecular dynamics is used to study the effect of deuteration on light absorption, dye adsorption dynamics, the averaged over vibrations driving force to injection (?G i ) and regeneration (?Gr), as well as on promotion of electron back-donation in dyes NK1 (2E,4E-2-cyano-5-(4-dimethylaminophenyl)penta- 2,4-dienoic acid) and NK7 (2E,4E-2-cyano-5-(4-diphenylaminophenyl)penta-2,4-dienoic acid) adsorbed in monodentate molecular and bidentate bridging dissociative configurations on the anatase (101) surface of TiO 2 . Deuteration causes a red shift of the absorption spectrum of the dye/TiO 2 complex by about 5% (dozens of nm), which can noticeably affect the overlap with the solar spectrum in real cells. The dynamics effect on the driving force to injection and recombination (the difference between the averaged <?G i,r > and ?G i,r equil at the equilibrium configuration) is strong, yet there is surprisingly little isotopic effect: the average driving force to injection <?G i > and to regeneration <?G r > changes by only about 10 meV upon deuteration. The nuclear dynamics enhance recombination to the dye ground state due to the approach of the electron-donating group to TiO 2 , yet this effect is similar for deuterated and non-deuterated dyes. We conclude that the nuclear dynamics of the C-H(D) bonds, mostly affected by deuteration, might not be important for the operation of photoelectrochemical cells based on organic dyes. As the expectation value of the ground state energy is higher than its optimum geometry value (by up to 0.1 eV in the present case), nuclear motions will affect dye regeneration by recently proposed redox shuttle-dye combinations operating at low driving forces. © 2013 by the authors.
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.sourceUnpaywall 20201031
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.3390/computation1010001
dc.description.sourcetitleComputation
dc.description.volume1
dc.description.issue1
dc.description.page1-15
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