Effect of regioisomeric substitution patterns on the performance of quinoxaline-based dye-sensitized solar cells

Jong Min Park, Chang Young Jung, Yue Wang, Hyun Dong Choi, Seong Je Park, Pinyin Ou, Woo Dong Jang, Jae Yun Jaung

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Abstract

Regioisomeric quinoxaline-based dyes (NQXs) were synthesized to study the effect of substitution patterns on the performance of quinoxaline-based dye sensitized solar cells (DSSCs). The 1 H NMR results indicated that the substitution patterns of ethylene groups on the quinoxaline unit greatly affect the molecular architecture through C–H⋯N hydrogen bonding, which also influenced the absorption and efficiency of the DSSCs. The highest occupied molecular orbital (HOMO) levels of the NQXs were estimated to range from 0.94 to 0.99 V by cyclic voltammetry and visible absorption studies, which is suitable for DSSCs. The photocurrent density-voltage curves and incident photon-to-electron conversion efficiency spectra of NQXs indicated that the introduction of phenothiazine groups at the 2- and 3-positions of quinoxaline is the most effective pattern for quinoxaline-based organic sensitizers in DSSCs.

Original languageEnglish
Pages (from-to)650-662
Number of pages13
JournalElectrochimica Acta
Volume298
DOIs
Publication statusPublished - 2019 Mar 1

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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