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High open-circuit voltage of graphene-based photovoltaic cells modulated by layer-by-layer transfer

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Authors
Ihm, Kyuwook; Lee, Kyung-Jae; Lim, Jong Tae; Kang, Tai-Hee; Chung, Sukmin; Hong, Byung Hee; Yeom, Geun Young
Issue Date
2012-06
Citation
Surface and Interface Analysis, Vol.44 No.6, pp.744-748
Keywords
PhotovoltaicGraphenePhotoelectron spectroscopy
Abstract
Graphene has shown great application opportunities in future nanoelectronic devices because of its outstanding electronic properties. Moreover, its impressive optical properties have been attracting the interest of researchers, and, recently, the photovoltaic effects of a heterojunction structure embedded with few layer graphene (FLG) have been demonstrated. Here, we report the photovoltaic response of graphenesemiconductor junctions and the controlled open-circuit voltage (Voc) with varying numbers of graphene layers. After unavoidably adsorbed contaminants were removed from the FLGs by means of in situ annealing, prepared by layer-by-layer transfer of the chemically grown graphene layer, the work functions of FLGs showed a sequential increase as the graphene layers increase, despite random interlayer-stacking, resulting in the modulation of photovoltaic behaviors of FLGs/Si interfaces. The surface photovoltaic effects observed here show an electronic realignment in the depth direction in the FLG heterojunction systems, indicating future potential toward solar devices utilizing the excellent transparency and flexibility of FLG. Copyright (c) 2011 John Wiley & Sons, Ltd.
ISSN
0142-2421
URI
https://hdl.handle.net/10371/172287
DOI
https://doi.org/10.1002/sia.3860
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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