Photon Management Strategies in Two Dimensional Molybdenum Disulfide

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dc.contributor.advisorThomann, Isabellen_US
dc.creatorBahauddin, Shah Mohammaden_US
dc.date.accessioned2017-07-31T17:25:32Zen_US
dc.date.available2017-07-31T17:25:32Zen_US
dc.date.created2016-12en_US
dc.date.issued2016-07-28en_US
dc.date.submittedDecember 2016en_US
dc.date.updated2017-07-31T17:25:32Zen_US
dc.description.abstractHere we take a first step toward tackling the challenge of incomplete optical absorption in monolayers of transition metal dichalcogenides for conversion of photon energy, including solar, into other forms of energy. We present a monolayer MoS2-based photoelectrode architecture that exploits nanophotonic light management strategies to enhance absorption within the monolayer of MoS2, while simultaneously integrating an efficient charge carrier separation mechanism facilitated by a MoS2/NiOx heterojunction. Specifically, we demonstrate two extremely thin photoelectrode architectures for solar-fuel generation: (i) a planar optical cavity architecture, MoS2/NiOx/Al, that improves optical impedance matching and (ii) an architecture employing plasmonic silver nanoparticles (Ag NPs), MoS2/Ag NPs/NiOx/Al, that further improves light absorption within the monolayer. We used a combination of numerical simulations, analytical models, and experimental optical characterizations to gain insights into the contributions of optical impedance matching versus plasmonic near-field enhancement effects in our plasmonic photoelectrode structures. By performing three-dimensional electromagnetic simulations, we predict structures that can absorb 37% of the incident light integrated from 400 to 700 nm within a monolayer of MoS2, a 5.9× enhanced absorption compared to that of MoS2 on a sapphire (Al2O3) substrate. Experimentally, a 3.9× absorption enhancement is observed in the total structure compared to that of MoS2/Al2O3, and photoluminescence measurements suggest this enhancement largely arises from absorption enhancements within the MoS2 layer alone. The results of these measurements also confirm that our MoS2/NiOx/Al structures do indeed facilitate efficient charge separation, as required for a photoelectrode. To rapidly explore the parameter space of plasmonic photoelectrode architectures, we also developed an analytical model based on an effective medium model that is in excellent agreement with results from numerical FDTD simulations. [Bahauddin, S. M., Robatjazi, H., and Thomann, I., ACS Photonics 3.5 (2016): 853-862.123]en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationBahauddin, Shah Mohammad. "Photon Management Strategies in Two Dimensional Molybdenum Disulfide." (2016) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/95602">https://hdl.handle.net/1911/95602</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/95602en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMolybdenum Disulfideen_US
dc.subjectPhoton Managementen_US
dc.subjectNanophotonicsen_US
dc.subjectTwo dimensional materialen_US
dc.subjectPhotocatalysisen_US
dc.titlePhoton Management Strategies in Two Dimensional Molybdenum Disulfideen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.majorPhotonics, Electronics and Nano-Devicesen_US
thesis.degree.nameMaster of Scienceen_US
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