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The Johnston Group is a research group within the sub-department of Condensed Matter Physics, which is part of the sub-faculty of Physics at the University of Oxford. Our current research may be divided into three themes (i) Semiconductor nanowires (ii) Terahertz photonic technologies and (iii) Vapour deposited Perovskite materials for photovoltaic applications.

For enquires about the group please contact:
Prof Michael B. Johnston (group leader), M.Johnston@physics.ox.ac.uk
Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.

Latest Publications


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The 2017 terahertz science and technology roadmap
Dhillon et al. J. Phys. D-Appl. Phys., 50:043001 (Feb 2017)
[ pdf ][ DOI:10.1088/1361-6463/50/4/043001 ]
Comprehensive roadmap of terahertz science and technology in 2017. This 50 page article reviews that state-of-the-art and predicts future directions or research.

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Influence of Interface Morphology on Hysteresis in Vapor-Deposited Perovskite Solar Cells
Patel et al. , 3:1600470 (Feb 2017)
[ pdf ][ DOI:10.1002/aelm.201600470 ]
We use interface engineering to produce highly crystalline perovskite hysteresis-free evaporated planar heterojunction solar cells. TEM reveals that poor interfaces leads to amorphous regions of MAPbI3, hysteresis and poor stabilised power conversion efficiencies.

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Broadband phase-sensitive single {InP} nanowire photoconductive terahertz detectors
Peng et al. Nano Lett., 16:4925-4931 (Aug 2016)
[ pdf ][ DOI:10.1021/acs.nanolett.6b01528 ]

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Electron-phonon coupling in hybrid lead halide perovskites
Wright et al. Nat. Commun., 7:11755 (May 2016)
[ pdf ][ DOI:10.1038/ncomms11755 ]
We show by photoluminescence measurements and first-principles calculations that longitudinal optical phonons dominate the electron-phonon coupling at room temperature in hybrid lead halide perovskites.

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Increased Photoconductivity Lifetime in GaAs Nanowires by Controlled n-Type and p-Type Doping
Boland et al. ACS Nano, 10:4219-4227 (Mar 2016)
[ pdf ][ DOI:10.1021/acsnano.5b07579 ]
Terahertz spectroscopy of GaAs nanowires with controlled n-type and p-type shell doping, to show enhanced lifetimes due to reduced surface recombination caused by doping-related band bending.

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Hybrid Perovskites for Photovoltaics: Charge-Carrier Recombination, Diffusion, and Radiative Efficiencies
Johnston et al. Accounts Chem. Res., 49:146--154 (Jan 2016)
[ pdf ][ DOI:10.1021/acs.accounts.5b00411 ]
A review of the photo physics of Perovskite based semiconductors
Group members March 2017

News

New Postdoc Positions Available
[Mar 2017] We are currently recruiting new postdocs in spectroscopy and vapour deposition of perovskite semiconductors [more...]
New Postdoc Position Available
[Mar 2017] We are currently recruiting a new postdoc in THz spectrocopy of semicondutor nanowires [more...]