Organic Materials (Apr 2021)

Dimeric Phenazinothiadiazole Acceptors in Bulk Heterojunction Solar Cells

  • Lukas Ahrens,
  • Yvonne J. Hofstetter,
  • Baris Celik,
  • Julian F. Butscher,
  • Frank Rominger,
  • Jan Freudenberg,
  • Yana Vaynzof,
  • Uwe H. F. Bunz

DOI
https://doi.org/10.1055/s-0041-1726459
Journal volume & issue
Vol. 03, no. 02
pp. 168 – 173

Abstract

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Abstract Two covalently linked triisopropylsilyl-ethynylated phenazinothiadiazoles were prepared through condensation of a spirocyclic and a bicyclic tetraketone with a 5,6-diaminobenzothiadiazole. The spirobisindene- and the ethanoanthracene-based linkers render the electron acceptors amorphous in thin films. The optoelectronic properties of the non-conjugated dimers are indistinguishable from that of the crystalline monomer. Bulk heterojunction solar cells were prepared with power conversion efficiencies peaking at 1.6%. The choice of linker neither influenced optical and electrochemical properties nor device performance.

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