Sangam: A Confluence of Knowledge Streams

Modification of Graphene for Applications in Optoelectronic Devices

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dc.contributor Russo, Saverio
dc.contributor Craciun, Monica
dc.creator Jones, Gareth Francis
dc.date 2018-02-16T12:50:56Z
dc.date 2017-09-22
dc.date.accessioned 2023-02-23T10:06:00Z
dc.date.available 2023-02-23T10:06:00Z
dc.identifier G. F. Jones, R. M. Pinto , A. de Sanctis, V. K. Nagareddy, C. D. Wright, H. Alves, M. F. Craciun and S. Russo. Highly efficient rubrene-graphene charge transfer interfaces as phototransistors in the visible regime. Adv. Mater. 29, 1702993 (2017)
dc.identifier A. de Sanctis, G. F. Jones, D. J. Wehenkel, F. Bezares, F. H. L. Koppens, M. F. Craciun and S. Russo. Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors. Sci. Adv., 3, e1602617 (2017)
dc.identifier E. Torres Alonso, G. Karkera, G. F. Jones, M. F. Craciun, and S. Russo. Homogeneously bright, flexible, and foldable lighting devices with functionalized graphene electrodes. ACS App. Mater. Int. 8, 16541-16545 (2016)
dc.identifier T. H. Bointon, G. F. Jones, A. de Sanctis, R. Hill-Pearce, M. F. Craciun and S. Russo. Large-area functionalized CVD graphene for work function matched transparent electrodes. Sci. Rep. 5, 16464 (2015)
dc.identifier EP/J000396/1
dc.identifier EP/K017160/1
dc.identifier EP/K010050/1
dc.identifier EP/G036101/1
dc.identifier EP/M001024/1
dc.identifier EP/M002438/1
dc.identifier 2012/R3
dc.identifier 2013/R2
dc.identifier http://hdl.handle.net/10871/31537
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/257062
dc.description Submitted by Gareth Francis Jones to the University of Exeter as a thesis for the degree of Doctor of Philosophy in Physics.
dc.description In this thesis, we investigate how the optical and electronic properties of graphene may be modified in proximity to various other materials. We present several examples of how modification in this way can help make graphene better suited for specific device applications. We develop a method of up-scaling the fabrication of FeCl3-intercalated few-layer graphene from micron-sized flakes to macroscopic films so that it may be used as a transparent electrode in flexible light-emitting devices. We also find that photo-responsive junctions can be arbitrarily written into FeCl3-intercalated few-layer graphene by means of optical lithography. These junctions produce photocurrent signals that are directly proportional to incident optical power over an extended range compared to other graphene photodetectors. Through theoretical analysis of these junctions, we conclude that the enhanced cooling of hot carriers with lattice phonons is responsible for this behaviour. Finally, we trial rubrene single crystals as the light-absorbing layer in a graphene phototransistor. We find that rubrene single crystal-graphene interfaces exhibit enhanced charge transfer efficiencies under illumination with extremely weak light signals. Through a comparative study with similar devices, we conclude that the wide variation in sensitivity amongst graphene phototransistors is largely due to extraneous factors relating to device geometry and measurement conditions.
dc.description Engineering and Physical Sciences Research Council
dc.description Royal Society
dc.language en
dc.publisher University of Exeter
dc.publisher Physics and Astronomy
dc.rights 24 month ebargo requested by Prof. Saverio Russo for the purposes of allowing un-published results to be submitted and peer-reviewed by a high impact journal. See supporting letter accompanying the physical thesis subsmission.
dc.rights 2019-09-23
dc.rights 24 month ebargo requested by Prof. Saverio Russo for the purposes of allowing un-published results to be submitted and peer-reviewed by a high impact journal.
dc.subject Research Subject Categories::NATURAL SCIENCES::Physics::Condensed matter physics::Semiconductor physics
dc.subject graphene
dc.subject optoelectronics
dc.subject photodetector
dc.subject two dimensional materials
dc.title Modification of Graphene for Applications in Optoelectronic Devices
dc.type Thesis or dissertation
dc.type PhD in Physics
dc.type Doctoral
dc.type PhD


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