Hu Youwang, Liang Chang, Sun Xiaoyan, Zheng Jianfen, Duan Ji'an, Zhuang Xuye
The State Key Laboratory of High Performance Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
East China Institute of Photo-Electronic IC, Bengbu 233033, China.
Nanomaterials (Basel). 2019 May 1;9(5):673. doi: 10.3390/nano9050673.
In order to improve the performance of silver nanowire (AgNW) flexible transparent conductive films (FTCFs), including the conductivity, uniformity, and reliability, the welding of high repetition rate femtosecond (fs) laser is applied in this work. Fs laser irradiation can produce local enhancement of electric field, which induce melting at the gap of the AgNWs and enhance electrical conductivity of nanowire networks. The overall resistivity of the laser-welded AgNW FTCFs reduced significantly and the transparency changed slightly. Meanwhile, PET substrates were not damaged during the laser welding procedure in particular parameters. The AgNW FTCFs can achieve a nonuniformity factor of the sheet resistance as 4.6% at an average sheet resistance of 16.1 Ω/sq and transmittance of 91%. The laser-welded AgNW FTCFs also exhibited excellent reliability against mechanical bending over 10,000 cycles. The welding process may open up a new approach for improvement of FTCFs photoelectric property and can be applied in the fabrication of silver nanostructures for flexible optoelectronic and integration of functional devices.
为了提高银纳米线（AgNW）柔性透明导电薄膜（FTCF）的性能，包括导电性、均匀性和可靠性，本工作采用了高重复频率飞秒（fs）激光焊接。飞秒激光辐照可产生局部电场增强，诱导银纳米线间隙处熔化，提高纳米线网络的电导率。激光焊接的AgNW FTCF的整体电阻率显著降低，透明度略有变化。同时，在特定参数的激光焊接过程中，PET基板未受损。AgNW FTCF在平均方阻为16.1 Ω/sq、透过率为91%时，方阻不均匀性因子可达4.6%。激光焊接的AgNW FTCF在超过10000次机械弯曲循环中也表现出优异的可靠性。该焊接工艺可能为改善FTCF的光电性能开辟一种新方法，并可应用于柔性光电器件的银纳米结构制造及功能器件集成。
