유연전자소자를 위한 차세대 유연 투명전극의 개발 동향
Technology of Flexible Transparent Conductive Electrode for Flexible Electronic Devices
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Flexible transparent conductive electrodes (TCEs) have recently attracted a great deal of attention owing torapid advances in flexible electronic devices, such as flexible displays, flexible photovoltanics, and e-papers. As theperformance and reliability of flexible electronics are critically affected by the quality of TCE films, it is imperative todevelop TCE films with low resistivity and high transparency as well as high flexibility. Indium tin oxide (ITO) has beenthe most dominant transparent conducting material due to its high optical transparency and electrical conductivity. However, ITO is susceptible to cracking and delamination when it is bent or deformed. Therefore, various types of flexibleTCEs, such as carbon nanotube, conducting polymers, graphene, metal mesh, Ag nanowires (NWs), and metal mesh havebeen extensively investigated. Among several options to replace ITO film, Ag NWs and metal mesh have been suggestedas the promising candidate for flexible TCEs. In this paper, we focused on Ag NWs and metal mesh, and summarizedthe current development status of Ag NWs and metal mesh. The several critical issues such as high contact resistanceand haze are discussed, and newly developed technologies to resolve these issues are also presented. In particular, theflexibility and durability of Ag NWs and metal mesh was compared with ITO electrode.
Abstract
Flexible transparent conductive electrodes (TCEs) have recently attracted a great deal of attention owing torapid advances in flexible electronic devices, such as flexible displays, flexible photovoltanics, and e-papers. As theperformance and reliability of flexible electronics are critically affected by the quality of TCE films, it is imperative todevelop TCE films with low resistivity and high transparency as well as high flexibility. Indium tin oxide (ITO) has beenthe most dominant transparent conducting material due to its high optical transparency and electrical conductivity. However, ITO is susceptible to cracking and delamination when it is bent or deformed. Therefore, various types of flexibleTCEs, such as carbon nanotube, conducting polymers, graphene, metal mesh, Ag nanowires (NWs), and metal mesh havebeen extensively investigated. Among several options to replace ITO film, Ag NWs and metal mesh have been suggestedas the promising candidate for flexible TCEs. In this paper, we focused on Ag NWs and metal mesh, and summarizedthe current development status of Ag NWs and metal mesh. The several critical issues such as high contact resistanceand haze are discussed, and newly developed technologies to resolve these issues are also presented. In particular, theflexibility and durability of Ag NWs and metal mesh was compared with ITO electrode.
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