聚乙烯亚胺包覆氧化锌电子传输材料的制备及其对有机光伏电池空气和紫外稳定性的增强效应

Refinement of Polyethyleneimine-coated Zinc Oxide Electron Transport Material and Investigation of Its Enhancing Effect on Air and Ultraviolet Stability of Organic Photovoltaic Devices

活性层与电极之间的界面层材料对有机太阳能电池(OSCs)至关重要,它直接影响器件的性能和稳定运行。作为一种广泛应用的电子传输材料,氧化锌(ZnO)纳米颗粒(NPs)较高的表面缺陷态易在表面吸附水氧,严重影响OSCs的效率和稳定性。因此,本文设计了一种既能钝化表面缺陷又能调节能级的聚乙烯亚胺(PEI)包覆ZnO NPs的协同策略,采用水热法成功合成了ZnO@PEI NPs,并将其作为电子传输层(ETL)应用于基于PM6∶BO-4Cl∶PC61BM的OSCs中。结果表明,使用ZnO@PEINPs作为ETL制备的光伏器件的光电转换效率(PCE)略有下降,但由于包覆的PEI钝化了ZnO表面缺陷,ZnO@PEI NPs器件展现出更好的空气和紫外稳定性。本研究提出了一个构建多功能、高稳定性ETL的有效策略,为实现高稳定OSCs提供了一条适用的新途径。

The interfacial layer materials situated between the active layer and electrodes are critical aspect of or⁃ganic solar cells(OSCs),as they directly affect device performance and stability during operation.Zinc oxide(ZnO)nanoparticles(NPs)are commonly functioned as electron transport layer(ETL)materials.However,their high surface defect states and susceptibility to adsorbing water and oxygen can significantly impact the efficiency and stability of OSCs.To tackle this issue,a synergistic approach was adopted in this study by employing polyethylenei⁃mine(PEI)-coated ZnO NPs to passivate surface defects and regulate energy levels.The resulting ZnO@PEI NPs was successfully synthesized using a hydrothermal method and served as an ETL in PM6∶BO-4Cl∶PC61BM-based OSCs.The experimental results indicate that the photovoltaic devices prepared using ZnO@PEI NPs as the ETL ex⁃hibit a slight decrease in the power conversion efficiency(PCE).However,due to the encapsulated PEI effectively passivating the surface defects of ZnO,the ZnO@PEI NPs devices demonstrate enhanced air and ultraviolet stability.In conclusion,this study proposes an effective strategy for developing multifunctional and highly stable ETL,present⁃ing a new and practical approach to achieving highly stable OSCs.