Xie Chen, Huang Hui, Li Zijian, Zeng Xianghui, Deng Baoshen, Li Chengsheng, Zhang Guangye, Li Shunpu
College of New Materials and New Energies, Shenzhen Technology University, Shenzhen 518118, China.
Polymers (Basel). 2023 Dec 28;16(1):91. doi: 10.3390/polym16010091.
The two-step layer-by-layer (LBL) deposition of donor and acceptor films enables desired vertical phase separation and high performance in organic solar cells (OSCs), which becomes a promising technology for large-scale printing devices. However, limitations including the use of toxic solvents and unpredictable infiltration between donor and acceptor still hinder the commercial production of LBL OSCs. Herein, we developed a water-based nanoparticle (NP) ink containing donor polymer to construct a mesoscale structure that could be infiltrated with an acceptor solution. Using non-halogen o-xylene for acceptor deposition, the LBL strategy with a mesoscale structure delivered outstanding efficiencies of 18.5% for binary PM6:L8-BObased LBL OSCs. Enhanced charge carrier mobility and restricted trap states were observed in the meso-LBL devices with optimized vertical morphology. It is believed that the findings in this work will bring about more research interest and effort on eco-friendly processing in preparation for the industrial production of OSCs.
施主和受主薄膜的两步逐层（LBL）沉积能够在有机太阳能电池（OSC）中实现所需的垂直相分离和高性能，这使其成为大规模印刷设备的一项有前景的技术。然而，包括使用有毒溶剂以及施主和受主之间不可预测的渗透等限制，仍然阻碍着LBL OSC的商业化生产。在此，我们开发了一种含有施主聚合物的水性纳米颗粒（NP）墨水，以构建一种可被受主溶液渗透的中尺度结构。使用非卤代邻二甲苯进行受主沉积，具有中尺度结构的LBL策略使基于二元PM6:L8-BO的LBL OSC的效率高达18.5%。在具有优化垂直形态的中尺度LBL器件中观察到电荷载流子迁移率增强和陷阱态受限。相信这项工作中的发现将引发更多关于环保工艺的研究兴趣和努力，为OSC的工业化生产做准备。
