材料科学
聚合物
图层(电子)
聚合
沉积(地质)
纳米技术
化学工程
形态学(生物学)
逐层
热稳定性
相(物质)
活动层
复合材料
有机化学
古生物学
化学
遗传学
沉积物
工程类
生物
薄膜晶体管
作者
Huiting Fu,Zhengxing Peng,Qunping Fan,Francis Lin,Qi Feng,Yixin Ran,Ziang Wu,Baobing Fan,Kui Jiang,Han Young Woo,Guanghao Lu,Harald Ade,Alex K.‐Y. Jen
标识
DOI:10.1002/adma.202202608
摘要
Abstract A major challenge hindering the further development of all‐polymer solar cells (all‐PSCs) employing polymerized small‐molecule acceptors is the relatively low fill factor (FF) due to the difficulty in controlling the active‐layer morphology. The issues typically arise from oversized phase separation resulting from the thermodynamically unfavorable mixing between two macromolecular species, and disordered molecular orientation/packing of highly anisotropic polymer chains. Herein, a facile top‐down controlling strategy to engineer the morphology of all‐polymer blends is developed by leveraging the layer‐by‐layer (LBL) deposition. Optimal intermixing of polymer components can be achieved in the two‐step process by tuning the bottom‐layer polymer swelling during top‐layer deposition. Consequently, both the molecular orientation/packing of the bottom layer and the molecular ordering of the top layer can be optimized with a suitable top‐layer processing solvent. A favorable morphology with gradient vertical composition distribution for efficient charge transport and extraction is therefore realized, affording a high all‐PSC efficiency of 17.0% with a FF of 76.1%. The derived devices also possess excellent long‐term thermal stability and can retain >90% of their initial efficiencies after being annealed at 65 °C for 1300 h. These results validate the distinct advantages of employing an LBL processing protocol to fabricate high‐performance all‐PSCs.
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