Graphene As Transparent Conducting Electrodes in Organic Photovoltaics: Studies in Graphene Morphology, Hole Transporting Layers, and Counter Electrodes
Graphene As Transparent Conducting Electrodes in Organic Photovoltaics: Studies in Graphene Morphology, Hole Transporting Layers, and Counter Electrodes
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DOI：
10.1021/nl303920b
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发表时间：
2012-01-01
期刊：
影响因子：
10.8
通讯作者：
Kong, Jing
中科院分区：
文献类型：
--
作者：
Park, Hyesung;Brown, Patrick R.;Kong, Jing
在这项工作中，构建了石墨烯电极的有机光伏(OPV)，其中包括石墨烯的形态、空穴传输层(HTL)和对电极的影响。为了解决石墨烯和poly(3，4-ethylenedioxythiophene)/poly(styrenesulfonate)的表面不相容问题，研究了一种替代传统的过渡金属氧化物(MoO_3)的过渡金属氧化物HTL。以铜为催化剂，采用低压化学气相沉积(LPCVD)法制备了石墨烯薄膜，并讨论了合成石墨烯在OPV衬底上转移的实验问题。石墨烯电极的形貌和HTL在石墨烯表面的润湿性对石墨烯薄膜成功地集成到OPV器件中起着重要的作用。研究了不同阴极对器件性能的影响。这些因素(即合适的HTL、石墨烯表面形态和残留物，以及匹配良好的对电极的选择)将为在未来的太阳能电池应用中利用石墨烯薄膜作为透明导电电极提供更好的理解。
In this work, organic photovoltaics (OPV) with graphene electrodes are constructed where the effect of graphene morphology, hole transporting layers (HTL), and counter electrodes are presented. Instead of the conventional poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) PEDOT:PSS HTL, an alternative transition metal oxide HTL (molybdenum oxide (MoO3)) is investigated to address the issue of surface immiscibility between graphene and PEDOT:PSS. Graphene films considered here are synthesized via low-pressure chemical vapor deposition (LPCVD) using a copper catalyst and experimental issues concerning the transfer of synthesized graphene onto the substrates of OPV are discussed. The morphology of the graphene electrode and HTL wettability on the graphene surface are shown to play important roles in the successful integration of graphene films into the OPV devices. The effect of various cathodes on the device performance is also studied. These factors (i.e., suitable HTL, graphene surface morphology and residues, and the choice of wellmatching counter electrodes) will provide better understanding in utilizing graphene films as transparent conducting electrodes in future solar cell applications.