Enhanced Electron Lifetimes in Dye-Sensitized Solar Cells Using a Dichromophoric Porphyrin: The Utility of Intermolecular Forces

Abstract

. (2015). Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces. ACS Applied Materials and Interfaces, 7 (39), 22078-22083. Enhanced electron lifetimes in dye-sensitized solar cells using a dichromophoric porphyrin: the utility of inter-molecular forces AbstractElectron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an organic dye, a 1:1 mixture of the two dyes and a di-chromophoric dye design consisting of the two dyes using a non-conjugated linker were measured, suggesting that the dispersion force of the organic dyes has a significant detrimental effect on the electron lifetime and that the di-chromophoric design can be utilized to control the effect of the dispersion force.Keywords electron, lifetimes, dye, sensitized, solar, enhanced, cells, forces, di, chromophoric, porphyrin, utility, inter, molecular Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsZhao, L., Wagner, P., van der Salm, H., Gordon, K. C., Mori, S. & Mozer, A. J. (2015). Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces. ACS Applied Materials and Interfaces, 7 (39), 22078-22083. Just Accepted "Just Accepted" manuscripts have been peer-reviewed and accepted for publication. They are posted online prior to technical editing, formatting for publication and author proofing. The American Chemical Society provides "Just Accepted" as a free service to the research community to expedite the dissemination of scientific material as soon as possible after acceptance. "Just Accepted" manuscripts appear in full in PDF format accompanied by an HTML abstract. "Just Accepted" manuscripts have been fully peer reviewed, but should not be considered the official version of record. They are accessible to all readers and citable by the Digital Object Identifier (DOI®). "Just Accepted" is an optional service offered to authors. Therefore, the "Just Accepted" Web site may not include all articles that will be published in the journal. After a manuscript is technically edited and formatted, it will be removed from the "Just Accepted" Web site and published as an ASAP article. Note that technical editing may introduce minor changes to the manuscript text and/or graphics which could affect content, and all legal disclaimers and ethical guidelines that apply to the journal pertain. ACS cannot be held responsible for errors or consequences arising from the use of information contained in these "Just Accepted" manuscripts. 1Enhanced electron lifetimes in dye-sensitized solar cells using a di-chromophoric porphyrin: the utility of inter-molecular forces 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 Electron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an orga...

Enhancement of dye regeneration kinetics in dichromophoric porphyrin–carbazole triphenylamine dyes influenced by more exposed radical cation orbitals

“…We have proposed that dye molecules increase local I 3 – concentrations due to electrostatic force caused by partial charge of dye molecules or dispersion force between dye and I 3 – . 20 , 21 Since the Cb-TPA moiety does not have any atoms with large partial charges, we expect that the faster regeneration kinetics was due to the dispersion force between the Cb-TPA and I – . On the other hand, since these forces are weak, the effect may not be so strong in the case of bulky Co complexes.…”

Effect of the second chromophore energy gap on photo-induced electron injection in di-chromophoric porphyrin-sensitized solar cells

“…The enhanced photovoltage of PorY- and PorO-sensitized solar cells is due to the employing of the non-conjugated linker between the organic chromophore and the porphyrin, adding steric effect thus increasing the electron lifetime [ 8 , 13 ]. This bulky effect might also be applicable in PorR-sensitized solar cells as compared to Por-sensitized solar cells; however, previous measurements under reduced dye loading condition suggest that the strong dispersion forces between the organic chromophore R and the redox couple in electrolyte contribute significantly to the longer electron lifetime of the former [ 9 ].…”

“…The change in photocurrent of these DSSCs has been analysed individually using the IPCE–LHE–APCE approach in our previous studies [ 9 , 13 ]. However, the impact of energy/electron transfer between the two chromophores on electron injection has not been studied.…”

“…Some other organic sensitizers with twisted structure also suggested an aggregation-free property [ 40 ]. As investigated by stepped-light induced measurements of photocurrent and photovoltage, the TiO 2 conduction band edge potential of PorR-sensitized DSSC was identical to that of Por-sensitized DSSC, which suggests that the driving forces for electron injection of the two systems are similar [ 9 ]. The fast recombination component at the dye-sensitized semiconductor surface is assigned to the strong coupling between the surface trap state and the oxidized dye [ 41 ], which should not be the cause in PorR-sensitized TiO 2 electrode because firstly, all the three di-chromophoric dyes PorY, PorO and PorR use the same porphyrin structure with typically less than 200 fs electron injection kinetics as coupling to the TiO 2 conduction band [ 39 ] and secondly, steady-state PL studies in figure 4 suggest similar PL intensity within the three di-chromophoric dyes, which may suggest similar excited state lifetime.…”

Application of stepped light‐induced transient measurements of photocurrent and photovoltage in charge‐transfer mechanism characterization

“…Similarly, factors that may affect electron lifetime are electron diffusion, conduction band edge potential, dye structure, and internal/solvent reorganization energies . Interesting ideas that emerged from these parameters are suggested to apply the SLIM‐PCV method by examining the voltage decay at open circuit condition.…”