Lagrange M, Langley D P, Giusti G, Jiménez C, Bréchet Y, Bellet D
Univ. Grenoble Alpes, LMGP, F-38000 Grenoble, France.
Nanoscale. 2015 Nov 7;7(41):17410-23. doi: 10.1039/c5nr04084a.
Silver nanowire (AgNW) networks are efficient as flexible transparent electrodes, and are cheaper to fabricate than ITO (Indium Tin Oxide). Hence they are a serious competitor as an alternative to ITO in many applications such as solar cells, OLEDs, transparent heaters. Electrical and optical properties of AgNW networks deposited on glass are investigated in this study and an efficient method to optimize them is proposed. This paper relates network density, nanowire dimensions and thermal annealing directly to the physical properties of the nanowire networksusing original physical models. A fair agreement is found between experimental data and the proposed models. Moreover thermal stability of the nanowires is a key issue in thermal optimization of such networks and needs to be studied. In this work the impact of these four parameters on the networks physical properties are thoroughly investigated via in situ measurements and modelling, such a method being also applicable to other metallic nanowire networks. We demonstrate that this approach enables the optimization of both optical and electrical properties through modification of the junction resistance by thermal annealing, and a suitable choice of nanowire dimensions and network density. This work reports excellent optical and electrical properties of electrodes fabricated from AgNW networks with a transmittance T = 89.2% (at 550 nm) and a sheet resistance of Rs = 2.9 Ω □(-1), leading to the highest reported figure of merit.
银纳米线（AgNW）网络作为柔性透明电极效率很高，并且制造成本比氧化铟锡（ITO）更低。因此，在许多应用中，如太阳能电池、有机发光二极管（OLED）、透明加热器，它们是ITO的有力竞争对手。本研究对沉积在玻璃上的AgNW网络的电学和光学性质进行了研究，并提出了一种优化这些性质的有效方法。本文使用原始物理模型将网络密度、纳米线尺寸和热退火直接与纳米线网络的物理性质相关联。实验数据与所提出的模型之间达成了合理的一致性。此外，纳米线的热稳定性是此类网络热优化中的一个关键问题，需要进行研究。在这项工作中，通过原位测量和建模全面研究了这四个参数对网络物理性质的影响，这种方法也适用于其他金属纳米线网络。我们证明，这种方法能够通过热退火改变结电阻，并适当选择纳米线尺寸和网络密度来优化光学和电学性质。这项工作报道了由AgNW网络制成的电极具有优异的光学和电学性质，其在550纳米处的透过率T = 89.2%，方阻Rs = 2.9Ω□(-1)，这是目前报道的最高品质因数。
