Zheng Zhi, He Enfang, Lu Yi, Yin Yuli, Pang Xinchang, Guo Fengyun, Gao Shiyong, Zhao Liancheng, Zhang Yong
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
ACS Appl Mater Interfaces. 2021 Apr 7;13(13):15448-15458. doi: 10.1021/acsami.1c00327. Epub 2021 Mar 26.
The ambient stability and processability of organic solar cells (OSCs) are important factors for their commercialization. Herein, we selected four benzo[1,2-:4,5-']difuran (BDF) polymers and two electron acceptors to examine the role of photovoltaic materials in the ambient stability. The investigations revealed that the MoO layer is the detrimental factor for the ambient stabilities. The penetration of MoO into the active layer and their interactions will strengthen the interface and form a favorable contact, hence leading to the increased photovoltaic performance, in which the efficiency loss induced by air was balanced out. As such, these BDF polymer-based non-fullerene (NF) OSCs possessed very promising ambient stabilities even after ∼1000 h with the almost maintained power conversion efficiencies (PCEs). These results drive us to further investigate the ambient processability of these NF-OSCs. The PCEs from the devices processed under ambient condition only possessed 0.3-2% loss compared to those devices under inert conditions, which suggest the significant potentials of BDF polymers to develop highly efficient and stable NF-OSCs for the practical applications.
有机太阳能电池（OSC）的环境稳定性和可加工性是其商业化的重要因素。在此，我们选择了四种苯并[1,2 - :4,5 - ']二呋喃（BDF）聚合物和两种电子受体，以研究光伏材料在环境稳定性中的作用。研究表明，MoO层是影响环境稳定性的不利因素。MoO渗透到活性层及其相互作用会强化界面并形成良好的接触，从而提高光伏性能，其中由空气引起的效率损失得到了平衡。因此，这些基于BDF聚合物的非富勒烯（NF）OSC即使在约1000小时后仍具有非常可观的环境稳定性，功率转换效率（PCE）几乎保持不变。这些结果促使我们进一步研究这些NF - OSC的环境可加工性。与在惰性条件下制备的器件相比，在环境条件下制备的器件的PCE仅损失了0.3 - 2%，这表明BDF聚合物在开发用于实际应用的高效稳定NF - OSC方面具有巨大潜力。
