Is graphene a good transparent electrode for photovoltaics and display applications?
Is graphene a good transparent electrode for photovoltaics and display applications?
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DOI：
10.1049/iet-cds.2015.0121
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发表时间：
2015-11-01
影响因子：
1.3
通讯作者：
Craciun, Monica Felicia
中科院分区：
文献类型：
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作者：
Bointon, Thomas H.;Russo, Saverio;Craciun, Monica Felicia
目前用于显示器、触摸屏和太阳能电池的透明电极的标准材料是氧化铟锡（ITO），它具有低片电阻（10 /）、高可见光透射率（85%）和不受光学雾霾的影响。然而，ITO在机械上是刚性的，与未来对灵活应用的需求不兼容。石墨烯材料具有柔性透明导体所需的许多特性，包括高光学透明度、高机械柔韧性和强度。虽然原始石墨烯不是一种良好的透明导体，但功能化石墨烯的导体性能至少是原始石墨烯的1000倍，并且优于ITO。在这里，作者回顾了最近在一种新型石墨烯基导体上的工作，这种导体的片电阻低至8.8 /，光透射率为84%。这种材料是通过将氯化铁（FeCl3）嵌入到少层石墨烯（FLG）中得到的，从而产生了一种新的系统，这是最著名的柔性透明电导体。FeCl3-FLG在长时间暴露于空气、高湿度和高达150摄氏度的大气温度下，电气和结构性能没有显着变化。这些特性使FeCl3-FLG成为ITO的可行且有吸引力的替代品。
The current standard material used for transparent electrodes in displays, touch screens and solar cells is indium tin oxide (ITO) which has low sheet resistance (10 /), high optical transmission in the visible wavelength (85%) and does not suffer of optical haze. However, ITO is mechanically rigid and incompatible with future demands for flexible applications. Graphene materials share many of the properties desirable for flexible transparent conductors, including high optical transparency, high mechanical flexibility and strength. Whilst pristine graphene is not a good transparent conductor, functionalised graphene is at least 1000 times a better conductor than its pristine counterpart and it outperforms ITO. Here the authors review recent work on a novel graphene-based conductor with sheet resistance as low as 8.8 / and 84% optical transmission. This material is obtained by ferric chloride (FeCl3) intercalation into few-layer-graphene (FLG), giving rise to a new system which is the best known flexible and transparent electricity conductor. FeCl3-FLG shows no significant changes in the electrical and structural properties for a long exposure to air, to high levels of humidity and at temperatures of up to 150 degrees C in atmosphere. These properties position FeCl3-FLG as a viable and attractive replacement to ITO.