Wu Jifa, Li Yumeng, Tang Feng, Guo Yinchun, Liu Guoqiang, Wu Shaoguang, Hu Bin, Fu Yuang, Lu Xinhui, Lu Guanghao, He Zhicai, Zhu Xuhui, Peng Xiaobin
State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, China.
Frontier Institute of Science and Technology, and State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710054, China.
Small. 2024 Oct;20(40):e2404066. doi: 10.1002/smll.202404066. Epub 2024 Jun 5.
Inverted organic solar cells (OSCs) have garnered significant interest due to their remarkable stability. In this study, the efficiency and stability of inverted OSCs are enhanced via the in situ self-organization (SO) of an interfacial modification material Phen-NaDPO onto tin oxide (SnO). During the device fabrication, Phen-NaDPO is spin-coated with the active materials all together on SnO. Driven by the interactions with SnO and the thermodynamic forces due to its high surface energy and the convection flow, Phen-NaDPO spontaneously migrates to the SnO interface, resulting in the formation of an in situ modification layer on SnO. This self-organization of Phen-NaDPO not only effectively reduces the work function of SnO, but also enhances the ordered molecular stacking and manipulates the vertical morphology of the active layer, which suppress the surface trap-assisted recombination and minimize the charge extraction. As a result, the SO devices based on PM6:Y6 exhibit significantly improved photovoltaic performance with an enhanced power conversion efficiency of 17.62%. Moreover, the stability of the SO device is also improved. Furthermore, the SO ternary devices based on PM6:D18:L8-BO achieved an impressive PCE of 18.87%, standing as one of the highest values for single-junction inverted organic solar cells to date.
倒置有机太阳能电池（OSCs）因其卓越的稳定性而备受关注。在本研究中，通过界面改性材料Phen-NaDPO在氧化锡（SnO）上的原位自组装（SO）提高了倒置OSCs的效率和稳定性。在器件制备过程中，Phen-NaDPO与活性材料一起旋涂在SnO上。由于其高表面能和对流流动，在与SnO的相互作用和热力学力的驱动下，Phen-NaDPO自发迁移到SnO界面，从而在SnO上形成原位改性层。Phen-NaDPO的这种自组装不仅有效降低了SnO的功函数，还增强了分子的有序堆积并调控了活性层的垂直形貌，抑制了表面陷阱辅助复合并使电荷提取最小化。结果，基于PM6:Y6的SO器件展现出显著改善的光伏性能，功率转换效率提高到了17.62%。此外，SO器件的稳定性也得到了提升。此外，基于PM6:D18:L8-BO的SO三元器件实现了令人印象深刻的18.87%的光电转换效率（PCE），是迄今为止单结倒置有机太阳能电池的最高值之一。
