| 초록 |
The asy-PBTBDT with a high MW had the largest μh values because of increase in the π–π stacking along with MW relative to low-MW asy-PBTBDTs. The high-MW asy-PBTBDT with a large μh achieved the highest power conversion efficiencies of 18.2% and 20.0% for the non-doped and doped states in PerSCs, respectively, and 5.7% in PSCs in green processed devices. Moreover, the glass transition temperature increased with an increase in MW; this showed an effective decrease in heat-induced morphological degradation in the photovoltaic devices. As well, as the chain density with MW increases, the robustness against humidity and oxygen is improved. Furthermore, Introducing Zwitter ion in PerSCs further increase efficiency and thermal stability. |
