Selective Wavelength Plasmonic Flash Light Welding of Silver Nanowires for Transparent Electrodes with High Conductivity

Abstract

In this work, silver nanowires (AgNWs) printed on a polyethylene terephthalate substrate using a bar coater were welded via selective wavelength plasmonic flash light irradiation. To achieve high electrical conductivity and transparent characteristics, the wavelength of the flash white light was selectively chosen and irradiated by using high-pass, low-pass, and band-pass filters. The flash white light irradiation conditions such as on-time, off-time, and number of pulses were also optimized. The wavelength range (400-500 nm) corresponding to the plasmonic wavelength of the AgNW could efficiently weld the AgNW films and enhance its conductivity. To carry out in-depth study of the welding phenomena with respect to wavelength, a multiphysics COMSOL simulation was conducted. The welded AgNW films under selective plasmonic flash light welding conditions showed the lowest sheet resistance (51.275 Ω/sq) and noteworthy transmittance (95.3%). Finally, the AgNW film, which was welded by selective wavelength plasmonic flash light with optical filters, was successfully used to make a large area transparent heat film and dye-sensitized solar cells showing superior performances.

Tackling the Stability Issues of Silver Nanowire Transparent Conductive Films through FeCl3 Dilute Solution Treatment

“…This reveals that the FeCl 3 -DS treatment can increase the mechanical flexibility of the AgNW films due to the welded wire–wire junctions which has been concluded to be induced by capillary force [37,40]. The welded wire–wire junctions can also be induced by the flash light welding process [49,50]. As schematically displayed in Figure 10a, when coating AgNWs on a substrate, pristine AgNWs stack loosely and the physical contacts between nanowires form a nanogap; when AgNW TCFs are exposed to solution and subsequent drying, shrinking occurs preferentially at such nanogaps, leading to the bending of nanowires altogether.…”

Implementation of Flexible Embedded Nanowire Electrodes in Organic Light‐Emitting Diodes

“…Indium tin oxide (ITO) is the industrial standard for TEs, due to its high optical transmittance in the visible spectral range (>80%), together with its low sheet resistance ( R sh ) of <15 Ω sq −1 . [ 6 ] These key features are easily achieved on glass substrates. [ 1 ] Yet, the trend in industry is moving toward production on poly(ethylene terephthalate) (PET) substrates, because roll‐to‐roll (R2R) production offers faster production speeds than traditional bulk production of inorganic semiconductor devices, such as silicon solar cells.…”

Fabrication of solderable intense pulsed light sintered hybrid copper for flexible conductive electrodes

“…IPL sintering has previously been utilized to reduce the Cu oxide shells by heat generation from surface plasmonic resonance and photo-degradation of polymeric binders 15 . IPL thus provides electrically conductive and oxide species reduction that reduce Cu particles for a high-performance ink receptive of existing printing technologies 16 – 18 .…”