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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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Three-dimensional cross-nanowire networks recover full terahertz state
Peng et al. Science, 368:510--513 (May 2020)
[ pdf ][ DOI:10.1126/science.abb0924 ]
We have developed a new nanowire-based THz sensor that recovers the full state of THz pulses.

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Trap states, electric fields, and phase segregation in mixed-halide perovskite photovoltaic devices
Knight et al. Adv. Energy Mater., 10:1903488 (Mar 2020)
[ pdf ][ DOI:10.1002/aenm.201903488 ]

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Light absorption and recycling in hybrid metal halide perovskite photovoltaic devices
Patel et al. Adv. Energy Mater., 10:1903653 (Mar 2020)
[ pdf ][ DOI:10.1002/aenm.201903653 ]
We use vapour co-deposition to control precisely the thickness of perovskite films, and study the effect of light management in thin film solar cells

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Control over Crystal Size in Vapor Deposited Metal-Halide Perovskite Films
Lohmann et al. ACS Energy Lett., 5:710-717 (Mar 2020)
[ pdf ][ DOI:10.1021/acsenergylett.0c00183 ]
We have developed a method to control crystal size when vapour depositing metal halide perovskite semiconductors

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Impurity Tracking Enables Enhanced Control and Reproducibility of Hybrid Perovskite Vapor Deposition
Borchert et al. ACS Appl. Mater. Interfaces, 11:28851-28857 (Jul 2019)
[ pdf ][ DOI:10.1021/acsami.9b07619 ]
Our results indicate that as long as precursor deposition rates are well controlled, physical vapor deposition will allow high solar cell device yields even if the purity of precursors changes from one run to another.

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Solution-processed all-perovskite multi-junction solar cells
McMeekin et al. Joule, 3:387-401 (Feb 2019)
[ pdf ][ DOI:10.1016/j.joule.2019.01.007 ]
Group members March 2017

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