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Keywords:

  • morphology;
  • organic photovoltaics;
  • grazing incidence X-ray scattering (GIXS);
  • bulk heterojunctions;
  • crystallization
Thumbnail image of graphical abstract

In situ X-ray measurements give insight into the effect of substrate temperature on the structural evolution of doctor–bladed poly(3-hexylthiophene):[6,6]-phenyl-C61 butyric acid methyl ester (P3HT:PCBM) blends during the transition from wet to solid. Drying the active layer at lower temperature (10 °C) leads to a better nanomorphology with a finer interpenetrating network, and may be an easy route for the optimization of the performance in doctor–bladed solar cells.