Two-Dimensional Graphene Bridges Enhanced Photoinduced Charge Transport in Dye-Sensitized Solar Cells

submitted by: zhaijin
As a novel two-dimensional (2D) material, graphene shows great benefits in electric and material science. Compared to 1D nanomaterials, it may show more excellent properties. Here, we introduced graphene as 2D bridges into the nanocrystalline electrodes of dye-sensitized solar cells, which brought a faster electron transport and a lower recombination, together with a higher light scattering. On the basis of these advantages, the short-circuit current density was increased by 45% without...
Authors: Nailiang Yang, Jin Zhai, Dan Wang, Yongsheng Chen, Lei Jiang

Large, Solution-Processable Graphene Quantum Dots as Light Absorbers for Photovoltaics

submitted by: li.liangshi
Graphenes have very attractive properties for photovoltaics. Their tunable bandgap and large optical absorptivity are desirable for efficient light harvesting. Their electronic levels and interfacing with other materials for charge transfer processes can both be tuned with well-developed carbon chemistry. Graphenes have also been shown to have very large charge mobilities, which could be useful for charge collection in solar cells. In addition, they consist of elements abundant on Earth and...
Authors: Liang-shi Li

Improved Synthesis of Graphene Oxide

submitted by: mikewilliams
An improved method for the preparation of graphene oxide (GO) is described. Currently, Hummers’ method (KMnO4, NaNO3, H2SO4) is the most common method used for preparing graphene oxide. We have found that excluding the NaNO3, increasing the amount of KMnO4, and performing the reaction in a 9:1 mixture of H2SO4/H3PO4 improves the efficiency of the oxidation process. This improved method provides a greater amount of hydrophilic oxidized graphene material as compared to Hummers’ method or...
Authors: Lawrence Alemany, Alexander Slesarev, Zhengzong Sun, Alexander Sinitskii, Jacob Berlin, Dmitry Kosynkin, Daniela Marcano, James Tour, Wei Lu