溶液加工大面积有机太阳电池材料与器件

Solution-processed Large Area Organic Solar Cells Materials and Devices

有机太阳电池是一类以有机光电材料为核心的新型光伏技术,具有重量轻、颜色可调、可低成本溶液加工、可实现柔性和半透明等突出优点,在建筑-光伏一体化、半透明车窗、便携式移动充电等领域具有独特的应用潜力.随着有机太阳电池在新材料方面的进步以及器件物理方面的发展,有机太阳电池效率实现了多次突破.与此同时,面向商业应用的大面积有机太阳电池模组的开发也越来越受到研究人员的关注.本文围绕溶液加工大面积有机太阳电池材料与器件,主要介绍了我们在领域内的工作进展,包括大面积均匀阴极界面层的构筑,印刷加工活性层过度聚集行为的抑制,新型印刷加工器件结构的探索等.最后讨论了有机太阳电池模组存在的问题,并对其未来发展进行了展望.

In the past few years, the performance of laboratory-scale organic solar cells(OSCs) have experienced very fast development, especially with the development of non-fullerene acceptor. However, there are still challenges on the way to realizing efficient module devices, such as the low compatibility of the thickness-sensitive interlayer and active layer with large area coating techniques, the tremendous power loss on enlarged electrode,the frequent need for toxic solvents, tedious optimization processes used during device fabrication, etc. To achieve high-performance large area PSC modules, we have carried out a series of studies. For the interlayer, we have developed simple and efficient approaches to achieving large area cathode interlayer using electrostatic layer-by-layer self-assembly and in situ self-assembly processes. N-type doping was also developed to obtain printable large area cathode interlayer. In terms of active layer, one of the main obstacles for printing ideal active layer comes from the excessive aggregation of film during printing. In this case, we have employed solvent engineering, third component strategy, molecular engineering and device structure engineering to overcome the excessive aggregation of active layer during printing and obtained high performance modules. On the basis of these results, non-halogen solvent dimethylbenzene processed large-area module with an active area of 18 cm~2 and efficiency over 14% was obtained. Finally, the existing problems and development directions of this field are discussed and forecasted.