Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3464319
Keywords
annealing; graphene; photovoltaic effects; silicon; solar cells; work function
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Funding
- Ministry of Education, Science and Technology [2010-0016332]
- National Research Foundation of Korea [2008-56529, 2009-0073387] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Impressive optical properties of graphene 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 show the direct dependence of open-circuit voltage (V-oc) on 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 of random interlayer-stacking, resulting in the modulation of photovoltaic behaviors of FLGs/Si interfaces. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3464319]
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