Highly Efficient and Robust Ternary All-Polymer Solar Cells Achieved by Electro-Active Polymer Compatibilizer
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초록
내용
All-polymer solar cells have shown promise in improving device stabilities compared to small molecular acceptor-based PSCs. However, low mixing entropy between polymer donors and acceptors hampers the development of optimized blend morphology. Herein, we develop efficient conjugated polymers that serve as interfacial compatibilizers between host PD and PNFA. Ternary all-polymer blends containing compatibilizer demonstrate improved blend morphology with strengthened interfaces, resulting in better photovoltaic properties and thermal/mechanical stabilities. In detail, the PCE increases from 15.4 to 17.1% upon addition of the compatibilizer. Moreover, the devices based on ternary blend enable good thermal stability, retaining 90% of the initial PCE after 96h at 125°C. Additionally, mechanical properties of ternary blend (i.e., cohesive fracture energy and crack onset strain) outperform binary blend.