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Blown Bubble Assembly of Graphene Oxide Patches for Transparent Electrodes in Carbon–Silicon Solar Cells

Wu, Shiting, Yang, Yanbing, Li, Yitan, Wang, Chunhui, Xu, Wenjing, Shi, Enzheng, Zou, Mingchu, Yang, Liusi, Yang, Xiangdong, Li, Yan, Cao, Anyuan
ACS Applied Materials & Interfaces 2015 v.7 no.51 pp. 28330-28336
carbon, copper, electrical conductivity, electrodes, graphene oxide, photovoltaic cells, polymers, silicon, solar energy
Graphene oxide (GO) sheets have a strong tendency to aggregate, and their interfaces can impose limitations on the electrical conductivity, which would hinder practical applications. Here, we present a blown bubble film method to assemble GO sheets with a uniform distribution over a large area and further interconnect individual GO sheets by transforming the bubble film into graphitized carbon. A conventional polymer was used to facilitate the bubble blowing process and disperse GO sheets in the bubble. Then, the bubble film was annealed on a Cu substrate, resulting in a highly transparent reduced GO (RGO)–carbon hybrid structure consisting of RGO patches well adhered to the carbon film. We fabricated RGO–carbon/Si solar cells with power conversion efficiencies up to 6.42%, and the assembled RGO patches hybridized with carbon film can form an effective junction with Si, indicating potential applications in thin film electronic devices and photovoltaics.