AIP Advances (Jan 2024)

Solution-based electrical doping of organic photovoltaics with non-fullerene acceptors facilitated by solvent vapor pre-treatment

  • Yi-Chien Chang,
  • Felipe A. Larrain,
  • Canek Fuentes-Hernandez,
  • Youngrak Park,
  • Bernard Kippelen

DOI
https://doi.org/10.1063/5.0189191
Journal volume & issue
Vol. 14, no. 1
pp. 015247 – 015247-6

Abstract

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Solution-based electrical doping of organic semiconductors using 12-molybdophosphoric acid (PMA) hydrate has been shown to allow p-type doping of conjugated polymers over a limited depth from the surface, enabling the fabrication of organic solar cells with a simplified device architecture. However, the doping level of certain conjugated polymers using PMA was found to be limited by the polymer film volume. Here, we report a modified PMA doping technique based on film volume expansion that is applicable to device fabrication, leading to hole-collecting layer-free non-fullerene organic photovoltaic devices, which exhibit a comparable photovoltaic performance to those with a commonly evaporated MoO3 hole-collecting layer.