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High open‐circuit voltage of graphene‐based photovoltaic cells modulated by layer‐by‐layer transfer
Ihm, Kyuwook,Lee, Kyung‐,Jae,Lim, Jong Tae,Kang, Tai‐,Hee,Chung, Sukmin,Hong, Byung Hee,Yeom, Geun Young John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.6
<P>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 graphene–semiconductor junctions and the controlled open‐circuit voltage (<I>V</I><SUB>oc</SUB>) with varying numbers of graphene layers. After unavoidably adsorbed contaminants were removed from the FLGs by means of <I>in situ</I> 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 © 2011 John Wiley & Sons, Ltd.</P>
임규욱(Kyuwook Ihm) 한국진공학회 2022 진공 이야기 Vol.9 No.1
Key discoveries of basic and applied research are related to the behavior of pseudo-particles against various external environments. Soft X-ray spectroscopy is a technique that unveils this information by detecting energy, momentum, spin, or their entanglement of electrons, and has become one of the key pillars supporting todays materials science. This importance led to the 4GSR construction project. Here, we review soft X-ray spectroscopy and introduce important recent research results using it.