In recent years, the application research of conductive metal nanowires, especially silver nanowires, has received extensive attention and is mainly used to prepare transparent conductive materials and extensible elastic conductive materials. Because the dispersion characteristics of metal nanowires are quite different from the traditional solution-type or particle-type liquid systems, silver nanowire conductive films are mainly obtained by methods such as coating, spraying, and spin coating. However, these existing mainstream film forming methods cannot directly realize patterning, and additional etching and other processes are needed to meet application requirements. Therefore, directly printing metal nanowires to obtain a transparent conductive pattern is one of the important means to simplify the process and reduce costs, and can further promote the application of conductive metal nanowires.
Printed top electrodes are another important challenge for current organic electronic devices. On the one hand, due to the poor mechanical strength and chemical stability of the organic devices, directly printed electrodes on the top of the device may cause relatively complex negative effects on the device performance and severely degrade the device performance. On the other hand, when the electrode is directly printed on the top of the device, the handling of the device printing surface is restricted, and it is difficult to obtain a desired printing effect. However, if the top electrode is prepared by the method of firstly coating and then patterning, the etching method may also damage the performance of the entire device. Therefore, many large-scale roll-to-roll organic printing devices, the top electrode is still the choice of vacuum deposition and other traditional methods of preparation.
The Cui Wei Group of the Suzhou Institute of Nanotechnology and Nanobionics of the Chinese Academy of Sciences conducted an in-depth study on the topic of printed silver nanowires and developed a variety of printing methods represented by ink jet printing to obtain patterned transparent conductive films directly. , achieved better than 85% transmittance, sheet resistance less than 20 ohms. Through cooperation with the Machang Group of the Suzhou Institute of Nanotechnology, researchers have overcome many difficulties in the printing process and the physics of organic devices, and successfully implemented the silver nanowires for inkjet printing as the top transparent electrode of translucent organic photovoltaic cells (OPVs). The device realizes translucency and reduces the cost of electrode preparation. At the same time, the conversion efficiency of the device is also very good. It can reach up to 90% of the traditional non-transparent electrode devices. Taking into account the influence of solvents on the device during the printing process, as well as part of the light loss caused by the transparent electrode, the result implies that this type of printed transparent electrode has a very good application prospect. The related results were published in Appl. Phys. Lett. 2015, 106, 093302.
This work has received strong support from the National Natural Science Foundation of China, the Chinese Academy of Sciences' strategic pilot technology project, and the National Science and Technology Support Program.
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