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Keywords:

  • solution-processed small molecules;
  • benzoporphyrin;
  • polycarbonate binder;
  • organic photovoltaics
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A new method to aid large-area solution processing of organic small molecule semiconductors is reported. A thermally degradable poly(propylene carbonate) (PC) binder is added to a solution of soluble precursor to a tetrabenzoporphyrin to increase its viscosity, allowing for the use of large-area methods such as inkjet printing, slot coating, or blade coating. This method is used to make bulk heterojunction solar cells with a p-i-n type structure.