Graphitic nanomaterials such as the zero dimensional (0D) fullerenes, one-dimensional (1D) carbon nanotubes and the two-dimensional (2D) graphene-based sheets have been extensively pursued as adducts for solution processed photovoltaics. If assembled together, they could form carbon-based heterojunctions for efficient light-to-electricity conversion. Because of their inherently poor solubility/processability, the assembly of dissimilar graphitic nanostructures into such heterojunctions typically involves extensive surface functionalization to impart processability. However, such strategies can adversely affect the functional carbon-carbon interfaces, thus hindering the transport of charge carriers. We report a new way to create photovoltaic all-carbon composites, in which single walled carbon nanotubes (SWCNTs) and fullerenes are directly co-assembled and processed in water using graphene oxide (GO) as a surfactant. Strategies of improving device performances are highlighted. Finally, a new generation of all-carbon solar cells is proposed, in which all the functional layers are made of graphitic nanomaterials.

Solution processed all-carbon solar cells

244th National Meeting (2012)

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