University of Oxford home page
Oxford Terahertz Photonics Group
Oxford Physics

Quick links:

Contact details
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),
Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.

Latest Publications

table of content figure
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.

table of content figure
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.

table of content figure
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

table of content figure
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

table of content figure
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 ]

table of content figure
Low Ensemble Disorder in Quantum Well Tube Nanowires
Davies et al. Nanoscale, 7:20531--20538 (Dec 2015)
[ pdf ][ DOI:10.1039/C5NR06996C ]
Group members April 2012


Funded Studentship avaiable in the group for Oct 2015 start
[May 2015] We currently have a vacancy for a fully funded PhD studentship on "Polymer Photonic Structures for Control of Terahertz Light" with the EPSRC Centre for Doctoral Training in Plastic Electronics. [more...]
Postdoctoral Position in Nanowire Spectroscopy
[May 2015] We are currently advertising for a postdoctoral researcher to work on optical spectroscopy of 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...]
Callum awarded 2013 EPSRC Doctoral Prize
[May 2013] Callum Docherty has been awarded an EPSRC Doctorial Prize for his work on terahertz spectroscopy of 2D systems. Callum will start postdoctoral work funded by the award early in 2014. [more...]
Noah wins prize for his MPhys Project
[July 2013] Congratulations to Noah Waterfield-Price for winning a Physics Prize for his MPhys project. [more...]