Reduced Graphene Oxide Micromesh Electrodes for Large Area, Flexible, Organic Photovoltaic Devices
Reduced Graphene Oxide Micromesh Electrodes for Large Area, Flexible, Organic Photovoltaic Devices
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DOI：
10.1002/adfm.201404046
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发表时间：
2015-04-15
影响因子：
19
通讯作者：
Kymakis, Emmanuel
中科院分区：
文献类型：
--
作者：
Konios, Dimitrios;Petridis, Constantinos;Kymakis, Emmanuel
提出了一种基于激光的图案化技术，与柔性、温度敏感的基板兼容，用于生产大面积还原氧化石墨烯微网（rGOMM）电极。可以精确控制网格图案，以显着增强电极透明度，随后薄层电阻略有增加，从而改善还原氧化石墨烯（rGO）层的透明度和电导率之间的权衡。特别是，对初始透明度约为20%的rGO薄膜进行图案化，得到的rGOMMs薄膜具有约59%的透光率和约565 Omega sq(-1)的方块电阻，这明显低于原始rGO薄膜在相同透明度下表现出的约780 Omega sq(-1)的电阻。作为概念验证应用，rGOMM 被用作柔性有机光伏 (OPV) 器件中的透明电极，实现了 3.05% 的功率转换效率，这是迄今为止报道的采用溶液处理石墨烯基电极的柔性 OPV 器件的最高效率。 rGO 的可控且高度可重复的激光诱导图案为刚性和柔性大型有机电子器件带来了巨大的希望，消除了石墨烯基电极和氧化铟锡电极之间的滞后，同时为下一代柔性电子产品提供了电导率和透明度可调性。
A laser-based patterning technique-compatible with flexible, temperature-sensitive substrates-for the production of large area reduced graphene oxide micromesh (rGOMM) electrodes is presented. The mesh patterning can be accurately controlled in order to significantly enhance the electrode transparency, with a subsequent slight increase in the sheet resistance, and therefore improve the tradeoff between transparency and conductivity of reduced graphene oxide (rGO) layers. In particular, rGO films with an initial transparency of approximate to 20% are patterned, resulting in rGOMMs films with a approximate to 59% transmittance and a sheet resistance of approximate to 565 Omega sq(-1), that is significantly lower than the resistance of approximate to 780 Omega sq(-1), exhibited by the pristine rGO films at the same transparency. As a proof-of-concept application, rGOMMs are used as the transparent electrodes in flexible organic photovoltaic (OPV) devices, achieving power conversion efficiency of 3.05%, the highest ever reported for flexible OPV devices incorporating solution-processed graphene-based electrodes. The controllable and highly reproducible laser-induced patterning of rGO hold enormous promise for both rigid and flexible large-scale organic electronic devices, eliminating the lag between graphene-based and indium-tin oxide electrodes, while providing conductivity and transparency tunability for next generation flexible electronics.