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  • Title: Efficiency enhancement of graphene/silicon-pillar-array solar cells by HNO3 and PEDOT-PSS.
    Author: Feng T, Xie D, Lin Y, Zhao H, Chen Y, Tian H, Ren T, Li X, Li Z, Wang K, Wu D, Zhu H.
    Journal: Nanoscale; 2012 Mar 21; 4(6):2130-3. PubMed ID: 22337348.
    Abstract:
    A single-layer graphene film was grown on copper foil by chemical vapor deposition and transferred onto a silicon-pillar-array (SPA) substrate to make a Schottky junction solar cell. The SPA substrate was specifically designed to suppress reflectance and enhance light absorption. The energy conversion efficiency of the prepared graphene/SPA solar cells achieved a maximum of 2.90% with a junction area of 0.09 cm(2). HNO(3) was employed to dope the graphene in the solar cells, and the time dependence of HNO(3) treatment on the cell performance was studied. Poly(3,4-ethylenedioxythiophene) polystyrenesulfonic acid (PEDOT-PSS) was also introduced in graphene/SPA solar cells by spin coating on top of the graphene film, and its modification on the cell performance was characterized. The results show that both HNO(3) and the PEDOT-PSS film could enhance the energy conversion efficiency of graphene/SPA solar cells.
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