We report a study on two types of the model thin-film systems: a bilayer SubPc/C₆₀ film and variously mixed (co-deposited) SubPc:C₆₀ films, where SubPc is boron chloride subphthalocyanine, C₆₀ is buckminsterfullerene, both materials are small molecule semiconductors widely known in photovoltaics. These systems were subjected to a full-day exposure (13 h) to a simulated sunlight in air, which was expected to cause either photodestruction or soft annealing of molecular materials, or both. The morphology of the films in the aged and pristine states was assessed and compared using four methods: ToF-SIMS, optical spectroscopy, surface relief analysis and XRD. Based on the findings, the following conclusions can be made: 1) Neither interlayer mixing in the bilayer nor any noticeable phase delamination occur in the mixed systems; 2) Ageing affects the film morphology rather than depth distribution of its components; 3) SubPc component gets strongly oxidized/destroyed with ageing; 4) In a gradient mixed film the concentration of the components tends to equalize through the ageing process; 5) Fullerene may demonstrate some features of ordering, whereas SubPc remains X-ray amorphous.

我们报告了对两种模型薄膜系统的研究：双层 SubPc/C ₆₀薄膜和各种混合（共沉积）SubPc:C ₆₀薄膜，其中 SubPc 是氯化硼亚酞菁，C ₆₀是巴克敏斯特富勒烯，这两种材料都是光伏领域广为人知的小分子半导体。这些系统在空气中的模拟阳光下暴露一整天（13 小时），预计这会导致分子材料的光破坏或软退火，或两者兼而有之。使用四种方法评估和比较老化和原始状态下薄膜的形态：ToF-SIMS、光学光谱、表面浮雕分析和 XRD。根据研究结果，可以得出以下结论： 1) 双层中没有层间混合，混合体系中没有发生任何明显的相分层；2）老化影响薄膜形态而不是其成分的深度分布；3) SubPc 组件随着老化而被强烈氧化/破坏；4) 在梯度混合膜中，组分的浓度通过老化过程趋于均衡；5) 富勒烯可能表现出一些有序的特征，而 SubPc 仍然是 X 射线非晶态。