Quinoxaline-Based Dual Donor, Dual Acceptor Organic Dyes for Dye-Sensitized Solar Cells
Autor: | Hammad Cheema, Louis E. McNamara, Jared H. Delcamp, Adithya Peddapuram, Yanbing Zhang, Nathan I. Hammer |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Materials science
dye energetics 010402 general chemistry Photochemistry 01 natural sciences 7. Clean energy lcsh:Technology Fluorescence spectroscopy lcsh:Chemistry Electron transfer chemistry.chemical_compound Quinoxaline chromophore General Materials Science dye-sensitized solar cells Instrumentation lcsh:QH301-705.5 organic dyes density functional theory Fluid Flow and Transfer Processes 010405 organic chemistry lcsh:T Process Chemistry and Technology General Engineering molecular engineering Chromophore fluorescence spectroscopy Acceptor lcsh:QC1-999 0104 chemical sciences 3. Good health Computer Science Applications Dye-sensitized solar cell photovoltaics chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Density functional theory Cyclic voltammetry lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
Zdroj: | Applied Sciences Volume 8 Issue 9 Applied Sciences, Vol 8, Iss 9, p 1421 (2018) |
ISSN: | 2076-3417 |
DOI: | 10.3390/app8091421 |
Popis: | A novel metal-free quinoxaline-based molecular framework with a dual donor and dual acceptor (DD-&pi AA) motif has been introduced. Four sensitizers (AP6, AP8, AP9, and AP12) have been synthesized and fully characterized via UV&ndash Vis absorption, cyclic voltammetry, density functional theory (DFT) calculations, time-correlated single photon counting (TCSPC), and in dye-sensitized solar cell (DSC) devices. Structural modifications to both the donor and acceptor/anchor regions were evaluated via structure&ndash property relationships without altering the quinoxaline &pi bridge. Through careful dye design, a broadly absorbing near-infrared (NIR) sensitizer extending electricity production to 800 nm is realized in DSC devices. Ground- and excited-state oxidation potentials were measured to show energetically favorable charge transfer events. Importantly, the dye structure was found to have a strong influence on dye energetics in different environments with structural elements allowing for either similar or dramatically different solution versus film measurements. The DSC device electrolyte was also found to have a significant influence on dye energetics as well. Electron transfer events were probed for each dye with DSC device measurements and with TCSPC studies. The results are correlated to the dye structures. |
Databáze: | OpenAIRE |
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