Deconvoluting the Photonic and Electronic Response of 2D Materials: The Case of MoS 2 .

Autor:	Zhang K; Department of Materials Science and Engineering, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States.; Center for Atomically Thin Multifunctional Coatings (ATOMIC), The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Borys NJ; The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States., Bersch BM; Department of Materials Science and Engineering, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Bhimanapati GR; Department of Materials Science and Engineering, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Xu K; Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15213, United States., Wang B; Department of Mechanical & Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Wang K; Materials Characterization Laboratory, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Labella M; Nanofabrication Laboratory, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Williams TA; Department of Materials Science and Engineering, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Haque MA; Center for Atomically Thin Multifunctional Coatings (ATOMIC), The Pennsylvania State University, University Park, Pennsylvania, 16802, United States.; Department of Mechanical & Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States., Barnard ES; The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States., Fullerton-Shirey S; Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15213, United States.; Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, 15213, United States., Schuck PJ; The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, 94720, United States., Robinson JA; Department of Materials Science and Engineering, Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania, 16802, United States. jrobinson@psu.edu.; Center for Atomically Thin Multifunctional Coatings (ATOMIC), The Pennsylvania State University, University Park, Pennsylvania, 16802, United States. jrobinson@psu.edu.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Dec 05; Vol. 7 (1), pp. 16938. Date of Electronic Publication: 2017 Dec 05.
DOI:	10.1038/s41598-017-16970-6
Abstrakt:	Evaluating and tuning the properties of two-dimensional (2D) materials is a major focus of advancing 2D science and technology. While many claim that the photonic properties of a 2D layer provide evidence that the material is "high quality", this may not be true for electronic performance. In this work, we deconvolute the photonic and electronic response of synthetic monolayer molybdenum disulfide. We demonstrate that enhanced photoluminescence can be robustly engineered via the proper choice of substrate, where growth of MoS 2 on r-plane sapphire can yield >100x enhancement in PL and carrier lifetime due to increased molybdenum-oxygen bonding compared to that of traditionally grown MoS 2 on c-plane sapphire. These dramatic enhancements in optical properties are similar to those of super-acid treated MoS 2 , and suggest that the electronic properties of the MoS 2 are also superior. However, a direct comparison of the charge transport properties indicates that the enhanced PL due to increased Mo-O bonding leads to p-type compensation doping, and is accompanied by a 2x degradation in transport properties compared to MoS 2 grown on c-plane sapphire. This work provides a foundation for understanding the link between photonic and electronic performance of 2D semiconducting layers, and demonstrates that they are not always correlated.
Databáze:	MEDLINE
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