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Dye-sensitized solar cells: investigation of D-A-π-A organic sensitizers based on [1,2,5]selenadiazolo[3,4-c]pyridine

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Author(s)

Ekaterina A. Knyazeva, Wenjun Wu, Timofey N. Chmovzh, Neil Robertson, J. Derek Woollins, Oleg A. Rakitin

School/Research organisations

Abstract

We report two series of D-A-π-A metal-free organic sensitizers for dye-sensitized solar cells (DSSCs) based on triphenylamine and N-hexyl-carbazole as electronic donors, respectively. Through varying auxiliary acceptors and π-spacers, several significant consequences on cell efficiency were identified: (i) a broadened UV-Vis absorption spectrum and low-lying LUMO level with [1,2,5]selenadiazolo [3,4-c] pyridine as auxiliary acceptor; (ii) compensation for the absorption valley around 400 nm in the UV-vis spectra by the introduction of a thiophene unit into the π-bridge; (iii) effective improvement of the power conversion efficiency (PCE) by means of cosensitization, leading to dye OKT-1, 3.10% PCE, increased to 4.19% with squaraine dye SQ2 as co-sensitizer. The design criteria identified have opened the door for further optimization of this new dye family.
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Details

Original languageEnglish
Pages (from-to)134-143
Number of pages10
JournalSolar Energy
Volume144
Early online date17 Jan 2017
DOIs
Publication statusPublished - 1 Mar 2017

    Research areas

  • Dye-sensitized solar cells, [1,2,5]Selenadiazolo[3,4-c] pyridine, Power conversion efficiency, Co-sensitizer

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