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학술지 Improved Optical Sintering Efficiency at the Contacts of Silver Nanowires Encapsulated by a Graphene Layer
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양승복, 최홍규, 이다솜, 최춘기, 최성율, 김일두
Small, v.11 no.11, pp.1293-1300
14ZE1100, ETRI 창의연구실 사업, 손승원
Graphene/silver nanowire (AgNWs) stacked electrodes, i.e., graphene/AgNWs, are fabricated on a glass substrate by air-spray coating of AgNWs followed by subsequent encapsulation via a wet transfer of single-layer graphene (SLG) and multilayer graphene (MLG, reference specimen) sheets. Here, graphene is introduced to improve the optical sintering efficiency of a xenon flash lamp by controlling optical transparency and light absorbing yield in stacked graphene/AgNW electrodes, facilitating the fusion at contacts of AgNWs. Intense pulsed light (IPL) sintering induced ultrafast (<20 ms) welding of AgNW junctions encapsulated by graphene, resulting in approximately a four-fold reduction in the sheet resistance of IPL-treated graphene/AgNWs compared to that of IPL-treated AgNWs. The role of graphene in IPL-treated graphene/AgNWs is further investigated as a passivation layer against thermal oxidation and sulfurization. This work demonstrates that optical sintering is an efficient way to provide fast welding of Ag wire-to-wire junctions in stacked electrodes of graphene/AgNWs, leading to enhanced conductivity as well as superior long-term stability under oxygen and sulfur atmospheres. Optical sintering with intense pulsed light (IPL) offers an effective welding method for silver nanowire (AgNW) junctions. Graphene overlayers coated on AgNWs facilitate the heat transfer from graphene to AgNWs by effectively absorbing IPL energy, resulting in improved sintering efficiency at the contact between Ag wires.
KSP 제안 키워드
Ag wire, Enhanced conductivity, Glass substrate, Graphene layer, Heat Transfer, Intense pulsed light, Long-Term Stability, Optical transparency, Silver nanowires(AgNWs), Spray coating, Thermal oxidation