Transparent Fused Nanowire Electrodes by Condensation Coefficient Modulation
Transparent Fused Nanowire Electrodes by Condensation Coefficient Modulation
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DOI：
10.1002/adfm.202005959
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发表时间：
2020-09-18
影响因子：
19
通讯作者：
Hatton, Ross A.
中科院分区：
文献类型：
--
作者：
Lee, Jaemin;Varagnolo, Silvia;Hatton, Ross A.
银纳米线网络可以为可拉伸传感器、柔性光电子和能量收集设备提供异常高性能的透明电极。然而，这种类型的电极存在制造复杂、纳米线结不稳定和表面粗糙度高的三重缺点，这限制了电极的性能和实用性。本文报道了一种制造银纳米线电极的新概念，该概念同时解决了这三个缺点，该概念基于电纺纳米纤维网络和支撑基板，它们的银蒸气冷凝系数分别为1和接近零。因此，当整个衬底通过简单的热蒸发暴露在银蒸气中时，金属选择性地沉积在纳米纤维网络上。这种方法的优点是简单，因为没有掩膜，化学或干金属蚀刻步骤，或网格转移步骤。此外，纳米线之间的接触电阻为零，表面粗糙度足够低，可以集成到有机光伏器件中。这个新概念为高性能熔银纳米线电极的连续卷对卷制造打开了大门，具有无数潜在的应用。
Silver nanowire networks can offer exceptionally high performance as transparent electrodes for stretchable sensors, flexible optoelectronics, and energy harvesting devices. However, this type of electrode suffers from the triple drawbacks of complexity of fabrication, instability of the nanowire junctions, and high surface roughness, which limit electrode performance and utility. Here, a new concept in the fabrication of silver nanowire electrodes is reported that simultaneously addresses all three of these drawbacks, based on an electrospun nanofiber network and supporting substrate having silver vapor condensation coefficients of one and near-zero, respectively. Consequently, when the whole substrate is exposed to silver vapor by simple thermal evaporation, metal selectively deposits onto the nanofiber network. The advantage of this approach is the simplicity, since there is no mask, chemical or dry metal etching step, or mesh transfer step. Additionally, the contact resistance between nanowires is zero and the surface roughness is sufficiently low for integration into organic photovoltaic devices. This new concept opens the door to continuous roll-to-roll fabrication of high-performance fused silver nanowire electrodes for myriad potential applications.