Screenshot 2021-04-04 150548 Published on 04/04/2021 at 1148 × 476 in Screenshot 2021-04-04 150548 Microscope images of PCBM crystals in (a) P3HT/PCBM, and (b) P3HT/P3HT-TDO/PCBM thin films after annealing at 130 °C. Microscope images of PCBM crystals in (a) P3HT/PCBM, and (b) P3HT/P3HT-TDO/PCBM thin films after annealing at 130 °C.