In this thesis we first briefly explore the barrier properties of monolayer graphene. We investigate how films of graphene can be used to decouple underlying metallic (Cu, Ni) substrate from the environment to passivate corrosion. In the remaining part of the thesis we explore the effects of the environment on electrical transport and optical properties of monolayer MoS2. In particular, we investigate the role of the underlying substrate, metallic contacts to MoS2 and phonons on intrinsic transport properties (e.g. carrier mobility) of MoS2. We then investigate the interplay between gate-induced charge carriers and excitons in MoS2 and discover the tunability of MoS2 optical properties (absorption/photoluminescence). Such strong electron-exciton interaction in MoS2 also opens up the possibility to study interesting quasi particles like trions and biexcitons in a 2D system. Finally, we thoroughly investigate Förster resonant energy transfer (FRET), a uniquely efficient long-range optical process, between quantum dots and monolayer MoS2. We discover that modest gate-induced variation in the excitonic absorption of MoS2 leads to large (~500%) changes in the FRET rate and allows modulation of quantum dot photoluminescence intensity.
| Identifer | oai:union.ndltd.org:VANDERBILT/oai:VANDERBILTETD:etd-11132015-094651 |
| Date | 13 November 2015 |
| Creators | Prasai, Dhiraj Kumar |
| Contributors | Kirill I. Bolotin, Jason G. Valentine, G. Kane Jennings, Richard F. Haglund Jr., Sharon M.Weiss |
| Publisher | VANDERBILT |
| Source Sets | Vanderbilt University Theses |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.vanderbilt.edu/available/etd-11132015-094651/ |
| Rights | restrictsix, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Vanderbilt University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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