Evidence for First-Order Charge Recombination in Dye-Sensitized Solar Cells
| Autor: | Timothy J. Barr, Gerald J. Meyer |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Renewable Energy Sustainability and the Environment Chemistry Iodide Energy Engineering and Power Technology 02 engineering and technology Electrolyte Electron 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Acceptor Redox 0104 chemical sciences Dye-sensitized solar cell chemistry.chemical_compound Fuel Technology Chemistry (miscellaneous) Materials Chemistry Reactivity (chemistry) 0210 nano-technology Acetonitrile |
| Zdroj: | ACS Energy Letters. 2:2335-2340 |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.7b00569 |
| Popis: | Charge recombination between electrons injected into TiO2 (TiO2(e–)s) and acceptors at the dye-sensitized electrolyte interface have been quantified by measurement of the open-circuit photovoltage, VOC, as a function of the incident photon flux. Literature reports indicate that the order of the reaction with respect to TiO2(e–)s is less than unity, typically 0.5–0.85. Herein, an alternative model is proposed and tested that incorporates a characteristic temperature T0 to model the density of acceptor states and photon flux-dependent TiO2(e–) lifetimes to account for shorter lifetimes at higher concentrations. Tests of this model with standard dye-sensitized solar cells based on the ditetrabutylammonium salt of cis-Ru(dcb)2(NCS)2 (N719, where dcb is 4,4′-(CO2H)2-2,2′-bipyridine) sensitizers in iodide/iodine acetonitrile electrolytes under 0.1–5 sun illumination revealed a reaction that is first-order in TiO2(e–)s with T0 = 1150 K. The first-order reactivity is consistent with an underlying TiIV/III redox r... |
| Databáze: | OpenAIRE |
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