Nanoscale heterogeneous distribution of surface energy at interlayers in organic bulkheterojunction solar cells
作者单位：CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology
会议名称：《第九届新型太阳能材料科学与技术学术研讨会》
会议日期：2022年
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：organic solar cells interface surface energy MoS2 morphology
摘 要：Surface energy of the underneath interlayer plays a crucial role in determining the morphology of bulk-heterojunction(BHJ) film in solution-processed organic solar cells(OSCs). However, little attention has been paid to this perspective at the microscopic level. In this study, we demonstrate an effective strategy to tune the nanoscale heterogeneous distribution of surface energy(HeD-SE) at interlayers through incorporating two-dimensional(2 D) MoS nanosheets, which modulate the component distribution, molecular orientation, and phase separation in the upper BHJ layers, leading to suppressed charge recombination and increased charge extraction in devices with enhanced power conversion efficiency(PCE) and device stability. Furthermore, we explore the relationship among the different surface energies of BHJs between the donor and the acceptor, the nanoscale He D-SE at interlayers, and the PCEs of the resultant devices. This work reveals the impact of nanoscale heterogeneity in the distribution of surface energy in the underneath interlayers on the BHJ morphology and device performanceinOSCs.[1]