| 초록 |
We report the photovoltaic performances of dibenzo[def,mno]chrysene-based polymer (PTVT or PTTC) solar cells as a function of thermal annealing temperatures from 100 °C to 180 °C. Interestingly, PTTC containing two thiophene units-based solar cells showed superior thermal stability compared to PTVTC:PC71BM solar cells (PTVTC is composed of two thiophene and vinyl groups). Atomic force microscopy (AFM), transmission electron microscopy (TEM), and x-ray diffraction (XRD) demonstrates that morphological stability of PTTC:PC71BM blend films conduces thermally stable photovoltaic performances of PTTC solar cells. Therefore, PTTC:PC71BM BHJ solar cells showed the highly stable efficiency as retaining 97% of its original power conversion efficiency value without PCBM clusters in the blend films even at elevated temperatures. To our knowledge, there have been no previous reports of dibenzo[def,mno]chrysene-based polymer solar cells on the thermal stability aspect. |
