A two-step junction welding technique for achieving high-performance broadband silver nanowire transparent conductive films

Abstract

Transparent conductive films (TCFs) are critical components of various optoelectronic and photovoltaic devices. The performance of TCFs is mainly ascribed to their superior transparency and low sheet resistance. However, the welding strategy for silver nanowires (AgNWs), the primary material used in TCFs, can significantly affect the optical and electrical properties of the films. Herein, we report a simple and effective method for preparing AgNWs TCFs with superior broadband transparency and conductivity. By applying pressure to the surface of graphene, we successfully enhanced the tight connections between loose nanowires. Based on this, we developed a high-performance, wide-spectrum TCF and employed ultraviolet welding as its post-treatment method. The sheet resistance of the electrode decreased to 27.1 Ω sq⁻¹ with the addition of graphene films, and subsequent UV light welding further reduced the resistance value by 25.1%. Moreover, the incorporation of graphene films provides excellent protection for AgNWs against oxidation. One month later, compared to AgNWs without a protective coating, the increase in sheet resistance was reduced by 414.6%. This study provides a new method for preparing TCFs with wide spectrum and high performance.