Compositional and electronic inhomogeneities in printed non-fullerene solar cells andtheir effect on device performance and stability

印刷非富勒烯太阳能电池的成分和电子不均匀性及其对器件性能和稳定性的影响

• 批准号: 511591466
• 负责人: Professorin Dr. Yana Vaynzof
• 金额: --
• 依托单位: Institut für Neuartige Elektronik-Technologien
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/511591466?language=en
• 关键词: Compositional; electronic; inhomogeneities; printed; non

Printed organic photovoltaics offer the possibility to produce inexpensive, large area and flexible products, yet certain challenges still need to be addressed prior to its integration in industrial applications. One of these challenges is related to the difficulty of forming uniform, homogeneous films over large areas. The presence of inhomogeneities will affect the function and performance of the printed devices as well as its stability. In this project, we will investigate the formation of compositional and electronic inhomogeneities in printed organic solar cells by spatially and energetically resolved photoemission spectroscopy (PES). Spatially resolved information across large areas can be obtained by using PES imaging or PES mapping, offering a resolution of 1 and 100 um, respectively. These length scales are highly relevant to the study of inhomogeneities and make it possible to characterise large samples (on a cm length scale). Vertically resolved measurements with a resolution of 1–2 nm are made possible by coupling the spectroscopic characterisation with gentle etching by a gas cluster ion beam, which offers an essentially damage-free etching of organic materials. The two methods can be combined in order to track the evolution of the composition and electronic structure of materials across large areas at various depths of the device active layer. These methods will enable us to characterise both compositional and electronic inhomogeneities as a function of lateral dimensions and depth. Together with other partners of the Research Unit POPULAR we will reveal how these inhomogeneities impact on the device performance, and in particular on the stability. The latter will be examined in detail in this project in order to elucidate how the presence of inhomogeneities formed during fabrication can lead to degradation, and alternatively, how the ageing of homogeneous printed layers can lead to the formation of inhomogeneities.

印刷的有机光致发光材料提供了生产廉价、大面积和灵活产品的可能性，但在将其集成到工业应用中之前，仍需要解决某些挑战。这些挑战之一涉及在大面积上形成均匀、均质膜的困难。不均匀性的存在将影响印刷器件的功能和性能以及其稳定性。在这个项目中，我们将调查的组成和电子不均匀性的形成在印刷有机太阳能电池的空间和能量分辨光电子能谱（PES）。通过使用PES成像或PES映射可以获得大面积的空间分辨信息，分别提供1和100 μ m的分辨率。这些长度尺度与不均匀性的研究高度相关，并使其有可能对大样品进行分析（在cm长度尺度上）。通过将光谱表征与气体团簇离子束的温和蚀刻相结合，可以实现分辨率为1-2 nm的垂直分辨测量，该气体团簇离子束提供了对有机材料的基本无损伤蚀刻。这两种方法可以结合起来，以便跟踪在器件有源层的不同深度处的大面积上材料的组成和电子结构的演变。这些方法将使我们能够将组成和电子不均匀性作为横向尺寸和深度的函数来计算。我们将与POPULAR研究部门的其他合作伙伴一起揭示这些不均匀性如何影响设备性能，特别是稳定性。后者将在本项目中详细研究，以阐明在制造过程中形成的不均匀性的存在如何导致降解，以及均匀印刷层的老化如何导致不均匀性的形成。