Wang Chao, Song Bo, Zhai Xin, Zhang Che, Du Mengyang, Miao Yanqin, Dong Peng
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
School of Electronic Science and Engineering, Southeast University, Nanjing 210096, People's Republic of China.
Nanotechnology. 2025 Jan 10;36(10). doi: 10.1088/1361-6528/ada449.
The performance of silver nanowire (AgNW) network flexible transparent electrodes is limited by large contact resistance, making it necessary to perform nanowelding to improve conductivity of the network. However, not all nanowire junctions can be welded. Our work indicates that the welding kinetics between nanowires depend on the crossing angle, with higher surface diffusion velocity prone to welding and fracture at nanowire junctions of crossing angles close to 90 degrees. The impact of nanowire crossing angles on the welding process makes it difficult to achieve simultaneous welding of random AgNWs networks. To address this issue, we adopted an improved Meyer rod coating method to prepared a cross-aligned nanowire network based on a layer-by-layer assembly strategy. Compared to randomly distributed AgNWs networks (11.17 Ω sq, 85.2%), the cross-aligned AgNWs network achieved simultaneous welding of nanowire junctions during thermal annealing, further enhancing the optoelectronic performance (10.8 Ω sq, 90.3%) of the AgNWs network, resulting in a superior figure of merit value of 421.
银纳米线（AgNW）网络柔性透明电极的性能受到大接触电阻的限制，因此有必要进行纳米焊接以提高网络的导电性。然而，并非所有纳米线结都能被焊接。我们的工作表明，纳米线之间的焊接动力学取决于交叉角度，在交叉角度接近90度的纳米线结处，较高的表面扩散速度易于焊接和断裂。纳米线交叉角度对焊接过程的影响使得难以实现随机AgNW网络的同时焊接。为了解决这个问题，我们采用了一种改进的迈耶棒涂布法，基于逐层组装策略制备了一种交叉排列的纳米线网络。与随机分布的AgNW网络（11.17Ω/sq，85.2%）相比，交叉排列的AgNW网络在热退火过程中实现了纳米线结的同时焊接，进一步提高了AgNW网络的光电性能（10.8Ω/sq，90.3%），从而得到了421的优异品质因数。
