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首页> 美国卫生研究院文献>Materials >Mechanical Properties of ZTO ITO and a-Si:H Multilayer Films for Flexible Thin Film Solar Cells
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Mechanical Properties of ZTO ITO and a-Si:H Multilayer Films for Flexible Thin Film Solar Cells

机译：用于柔性薄膜太阳能电池的ZTOITO和a-Si：H多层膜的机械性能

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The behavior of bi- and trilayer coating systems for flexible a-Si:H based solar cells consisting of a barrier, an electrode, and an absorption layer is studied under mechanical load. First, the film morphology, stress, Young’s modulus, and crack onset strain (COS) were analyzed for single film coatings of various thickness on polyethylene terephthalate (PET) substrates. In order to demonstrate the role of the microstructure of a single film on the mechanical behavior of the whole multilayer coating, two sets of InSnOx (indium tin oxide, ITO) conductive coatings were prepared. Whereas a characteristic grain–subgrain structure was observed in ITO-1 films, grain growth was suppressed in ITO-2 films. ITO-1 bilayer coatings showed two-step failure under tensile load with cracks propagating along the ITO-1/a-Si:H-interface, whereas channeling cracks in comparable bi- and trilayers based on amorphous ITO-2 run through all constituent layers. A two-step failure is preferable from an application point of view, as it may lead to only a degradation of the performance instead of the ultimate failure of the device. Hence, the results demonstrate the importance of a fine-tuning of film microstructure not only for excellent electrical properties, but also for a high mechanical performance of flexible devices (e.g., a-Si:H based solar cells) during fabrication in a roll-to-roll process or under service.
机译：在机械载荷下研究了由阻挡层，电极和吸收层组成的基于a-Si：H的柔性a-Si：H太阳能电池的双层和三层涂层系统的性能。首先，分析了聚对苯二甲酸乙二醇酯（PET）基底上各种厚度的单层膜的膜形态，应力，杨氏模量和裂纹起始应变（COS）。为了证明单层膜的微结构对整个多层涂层的机械性能的作用，制备了两组InSnOx（铟锡氧化物，ITO）导电涂层。尽管在ITO-1膜中观察到了特征性的亚晶结构，但在ITO-2膜中却抑制了晶粒长大。 ITO-1双层涂层在拉伸载荷下表现出两步破坏，裂纹沿着ITO-1 / a-Si：H-界面传播，而基于非晶ITO-2的可比双层和三层中的通道化裂纹贯穿所有组成层。从应用的角度来看，两步故障是可取的，因为它只会导致性能下降，而不是导致设备的最终故障。因此，结果表明，在滚动制造过程中，不仅要对薄膜的微结构进行微调，不仅对于优异的电性能，而且对于柔性器件（例如，基于a-Si：H的太阳能电池）的高机械性能也很重要。滚动流程或正在维护中。

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