Importance of Tuning Aggregation Behaviors of BDT-based Polymers for Achieving Additive- and Annealing-Free High-Performance All-Polymer Solar Cells
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초록
내용
The morphology of polymer is in charge of critical roles in the performance of all-polymer solar cells (All-PSCs). Thus post-treatments such as additive, annealing are used for optimized film morphology. Herein, we suggest a simple solution for optimizing morphology with as-cast process by extending conjugation with well-transition of aggregate from solution to film. Specifically, we introduce PBDB-S which is derivatives from PBDB-T by enlarging conjugation region. PBDB-Bz showed increasing at intermolecular interaction in solution and superial morphology at film without post-treatment than PBDB-T as evidenced by UV-vis absorption and grazing incidence X-ray scattering(GIXS). In all-PSCs, compared to the 7.4% efficiency of PBDB-T: P(NDI2OD-T2) while PBDB-S showed 8.5% of efficiency, and 9.5% of efficiency was achieved by temperature controlled condition. Our work provides detailed design with charateristic analysis for revealing relation between aggregation and film morphology.