Effect of coadsorbent properties on the photovoltaic performance of dye-sensitized solar cells

Lim, Jongchul; Kwon, Young Soo; Park, Jin Young

doi:10.1039/c0cc04999a

Cited by 88 publications

(88 citation statements)

References 15 publications

(24 reference statements)

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“…One of the reason for poor long-term stability of DSSCs is weakly bound dye molecules on TiO 2 surface12. Recently, the long-term stability of DSSCs has been improved through molecular engineering of a sensitizer in conjunction with the use of a nonvolatile electrolyte13141516.…”

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confidence: 99%

Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Heo

Jun

Park

2013

Sci Rep

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The widespread commercialization of dye-sensitized solar cells remains limited because of the poor long-term stability. We report on the influence of dye-molecules added in liquid electrolyte on long-term stability of dye-sensitized solar cells. Dye-desorption from the TiO2 surface during long-term cycling is one of the decisive factors that degrade photocurrent densities of devices which in turn determine the efficiencies of the devices. For the first time, desorption of dye from the TiO2 surface could be suppressed by controlling thermodynamic equilibrium; by addition of dye molecules in the electrolyte. The dye molecules in the electrolyte can suppress the driving forces for the adsorbed dye molecules to be desorbed from TiO2 nanoparticles. As a result, highly enhanced device stabilities were achieved due to the reduction of dye-desorption although there was a little decrease in the initial efficiencies.

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confidence: 99%

Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Heo

Jun

Park

2013

Sci Rep

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“…N719 was desorbed from the TiO 2 film by immersing the sensitized electrodes into 0.1 M KOH aqueous solutions. 30 The absorption intensity reached 14% at a concentration 10 times higher (3.0 mM).…”

Section: Dye and Coadsorbent Adsorption Behaviormentioning

confidence: 95%

Enhanced performance of dye-sensitized solar cells with dual-function coadsorbent: reducing the surface concentration of dye–iodine complexes concomitant with attenuated charge recombination

Mazloum-Ardakani

Khoshroo

2015

Phys. Chem. Chem. Phys.

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In this paper, we have investigated the effects of oleic acid as a dual-function coadsorbent on recombination and iodine binding in dye-sensitized solar cells. Oleic acid as a dual-function coadsorbent effectively shields the back electron transfer from TiO2 to I3(-) ions and also reduces the surface concentration of dye-I2 complexes via iodine binding to the unsaturated double bond on oleic acid. It was found that interaction between iodine and the double bond of oleic acid keeps the iodine molecules away from the surface and reduces the recombination rate between injected electrons in a semiconductor and iodine molecules and also increases open-circuit voltage. Furthermore, the interaction between iodine molecules and unexcited dyes affects the UV-Vis spectrum of them and prevents an unfavorable blue shift. Overall, the results point to an improved performance for DSC operation and development.

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“…Modification of the interface by the introduction of co-adsorbents along with the dye can alter the conduction band edge and shield the trap states of TiO 2 to influence the V oc , J sc , and the recombination reaction of the photo-induced electrons [58][59][60][61][62][63][64]. It was reported that stearic acid as a co-adsorbent, which has a low dipole moment and high solubility, hindered the rate of dye adsorption during the competitive anchoring process on the TiO 2 layer in DSC and increased the content of strongly bound dye on the TiO 2 surface [65]. This resulted in an approximately 25% improvement in J sc and the power conversion efficiency of the DSC even with much lower dye coverage.…”

Section: Tio 2 -Dye Junctionmentioning

confidence: 98%

Key technological elements in dye-sensitized solar cells (DSC)

Rhee

Kwon

2011

Korean J. Chem. Eng.

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The best cell efficiency of lab scale dye sensitized solar cell (DSC) exceeds 11%, but there are still many technological problems to overcome for commercialization. This review describes key technological elements in DSC, including working electrodes with dye/TiO 2 /electrolyte interfaces, quasi solid state electrolyte with ion diffusion, and counter electrodes with electrolyte-catalytic electrode interfaces. Their operating principles, equivalent electric circuits and measurement techniques are described.

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Effect of coadsorbent properties on the photovoltaic performance of dye-sensitized solar cells

Cited by 88 publications

References 15 publications

Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Dye molecules in electrolytes: new approach for suppression of dye-desorption in dye-sensitized solar cells

Enhanced performance of dye-sensitized solar cells with dual-function coadsorbent: reducing the surface concentration of dye–iodine complexes concomitant with attenuated charge recombination

Key technological elements in dye-sensitized solar cells (DSC)

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