Processing-Morphology-Property Relations in Inkjet-Printed Organic Photovoltaics

Organic photovoltaics (OPVs) are an emerging alternative technology to silicon-based solar cells. Our group uses the technique of inkjet-printing (IJP) to manufacture OPVs. This allows precise patterning on a small scale with minimal material waste. Given that the use of IJP has been limited when it comes to the manufacturing of OPVs, we have been trying to shed light on the inter-dependence of crystallinity and processing parameters in inkjet-printed OPVs. So far, we have explored parameters such as the choice of solvent(s), addition of ternary components and printing temperature. This time, we propose the study of microstructural changes brought about by drying behaviour and the use of different acceptors. Concretely, this implies uncovering the molecular arrangement and formation of crystalline domains when 1) processing with solvents of different boiling points and 2) the use of different acceptors in the active layer.

有机光伏（Organic photovoltaics，OPVs）是一类新兴的硅基太阳能电池替代技术。本课题组采用喷墨印刷（Inkjet-printing，IJP）技术制备OPVs，该技术可实现小尺度范围内的精准图案化，同时将材料损耗降至最低。鉴于目前喷墨印刷技术在OPV制备中的应用仍存在诸多局限，本课题组一直致力于阐明喷墨印刷制备的OPVs中结晶度与工艺参数之间的内在关联。迄今为止，本课题组已探索了溶剂选择、三元组分添加以及印刷温度等多项工艺参数。本次研究拟聚焦于干燥行为与不同受体材料使用所引发的微观结构变化，具体而言，本研究将揭示两种场景下的分子排列与晶域形成机制：一是采用不同沸点的溶剂进行工艺处理时，二是在活性层中使用不同受体材料时。