M. Johnston

Publications293
h-index70
Citations32,705
Highly Influential Citations223
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Efficient planar heterojunction perovskite solar cells by vapour deposition
TLDR
It is shown that perovskite absorbers can function at the highest efficiencies in simplified device architectures, without the need for complex nanostructures.
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Formamidinium lead trihalide: a broadly tunable perovskite for efficient planar heterojunction solar cells
Perovskite-based solar cells have attracted significant recent interest, with power conversion efficiencies in excess of 15% already superceding a number of established thin-film solar cell…
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Lead-free organic–inorganic tin halide perovskites for photovoltaic applications
Already exhibiting solar to electrical power conversion efficiencies of over 17%, organic–inorganic lead halide perovskite solar cells are one of the most promising emerging contenders in the drive…
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The 2016 terahertz science and technology roadmap
Science and technologies based on terahertz frequency electromagnetic radiation (100 GHz–30 THz) have developed rapidly over the last 30 years. For most of the 20th Century, terahertz radiation, then…
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A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells
TLDR
It is shown that using cesium ions along with formamidinium cations in lead bromide–iodide cells improved thermal and photostability and lead to high efficiency in single and tandem cells.
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Electron mobility and injection dynamics in mesoporous ZnO, SnO₂, and TiO₂ films used in dye-sensitized solar cells.
TLDR
A comparative study of electron mobility and injection dynamics in thin films of TiO, ZnO, and SnO(2) nanoparticles sensitized with Z907 ruthenium dye concludes that these injection dynamics are not substantially influenced by bulk energy level offsets but rather by the local environment of the dye-nanoparticle interface that is governed by dye binding modes and densities of states available for injection.
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High Charge Carrier Mobilities and Lifetimes in Organolead Trihalide Perovskites
Organolead trihalide perovskites are shown to exhibit the best of both worlds: charge-carrier mobilities around 10 cm2 V−1 s−1 and low bi-molecular charge-recombination constants. The ratio of the…
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Hybrid Perovskites for Photovoltaics: Charge-Carrier Recombination, Diffusion, and Radiative Efficiencies.
TLDR
The radiative efficiency for hybrid lead halide perovskite films is examined and it is found that if high efficiencies are to be obtained for intermediate charge-carrier densities (n ≈ 10(14) cm(-3)) trap-related recombination lifetimes will have to be enhanced well into the microsecond range, and the radiative efficiencies that may be obtained are evaluated.
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Temperature‐Dependent Charge‐Carrier Dynamics in CH3NH3PbI3 Perovskite Thin Films
The photoluminescence, transmittance, charge‐carrier recombination dynamics, mobility, and diffusion length of CH3NH3PbI3 are investigated in the temperature range from 8 to 370 K. Profound changes…
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Perovskite-perovskite tandem photovoltaics with optimized band gaps
TLDR
This device architecture and materials set will enable “all-perovskite” thin-film solar cells to reach the highest efficiencies in the long term at the lowest costs.
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