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        Research Highlights
        Research Highlights

        Modulation-doped growth of mosaic graphene with single-crystalline p–n junctions for efficient photocurrent generation

        Modulation-doped growth of mosaic graphene with single-crystalline p–n junctions for efficient photocurrent generation

         

        Nature Communications 2012, 3, 1280; J. Am. Chem. Soc. 2013, 135, 10926; Small 2014, 10, 2245; Phys. Rev. Lett. 2014, 113, 086102.

         

        Device applications of graphene such as ultrafast transistors and photodetectors benefit from the combination of both high-quality p- and n-doped components prepared in a large-scale manner with spatial control and seamless connection. Here we develop a well-controlled chemical vapour deposition process for direct growth of mosaic graphene. Mosaic graphene is produced in large-area monolayers with spatially modulated, stable and uniform doping, and shows considerably high room temperature carrier mobility of ~5000 cm2/V s in intrinsic portion and ~2500 cm2/V s in nitrogen-doped portion. The unchanged crystalline registry during modulation doping indicates the single-crystalline nature of p–n junctions. Efficient hot carrier-assisted photocurrent was generated by laser excitation at the junction under ambient conditions. This study provides a facile avenue for large-scale synthesis of single-crystalline graphene p–n junctions, allowing for batch fabrication and integration of high-efficiency optoelectronic and electronic devices within the atomically thin film.

         

         

         

         

         

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