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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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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

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Formation Dynamics of CH$_3$NH$_3$PbI$_3$ Perovskite Following Two-Step Layer Deposition
Patel et al. J. Phys. Chem. Lett., 7:96-102 (Jan 2016)
[ pdf ][ DOI:10.1021/acs.jpclett.5b02495 ]
We follow the formation of MAPbI3 from PbI2 and MAI precursors using XRD, VIS, and PL spectroscopies and show the importance of water in achieving full crystallisation

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A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells
McMeekin et al. Science, 351:151-155 (Jan 2016)
[ pdf ][ DOI:10.1126/science.aad5845 ]
Group members April 2012

News

UK Nanowires Discussion Meeting 12 Jan 2017
[Dec 2016] Registration is open for a one-day discussion meeting on UK research into semiconductor nanowires [more...]
Hannah appointed as University Lecturer at Cambridge
[Sept 2013] Dr Hannah Joyce has been appointed as a University Lecturer in the Department of Engineering at the University of Cambridge. Hannah will be leaving us mid-September. [more...]