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CMP
Credit: Jack Hobhouse

Prof Henry Snaith FRS

Professor of Physics

Sub department

  • Condensed Matter Physics

Research groups

  • Snaith group
  • Advanced Device Concepts for Next-Generation Photovoltaics
Henry.Snaith@physics.ox.ac.uk
Robert Hooke Building, room G21
  • About
  • Publications

Metal-halide perovskites for photovoltaic and light-emitting devices

Nature Nanotechnology Springer Nature 10:5 (2015) 391-402

Authors:

Samuel D Stranks, Henry J Snaith
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Direct Measurement of the Exciton Binding Energy and Effective Masses for Charge carriers in an Organic-Inorganic Tri-halide Perovskite

(2015)

Authors:

Atsuhiko Miyata, Anatolie Mitioglu, Paulina Plochocka, Oliver Portugall, Jacob Tse-Wei Wang, Samuel D Stranks, Henry J Snaith, Robin J Nicholas
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Non-ferroelectric nature of the conductance hysteresis in CH3NH3PbI3 perovskite-based photovoltaic devices

Applied Physics Letters AIP Publishing 106:17 (2015) 173502

Authors:

J Beilsten-Edmands, GE Eperon, RD Johnson, HJ Snaith, PG Radaelli
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Non-ferroelectric nature of the conductance hysteresis in CH3NH3PbI3 perovskite-based photovoltaic devices

(2015)

Authors:

J Beilsten-Edmands, GE Eperon, RD Johnson, HJ Snaith, PG Radaelli
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Fast charge-carrier trapping in TiO2 nanotubes

Journal of Physical Chemistry C American Chemical Society 119:17 (2015) 9159-9168

Authors:

Christian Wehrenfennig, CM Palumbiny, Henry J Snaith, Michael Johnston, L Schmidt-Mende, Laura Herz

Abstract:

One-dimensional semiconductors such as nanowires and nanotubes are attractive materials for incorporation in photovoltaic devices as they potentially offer short percolation pathways to charge-collecting contacts. We report the observation of free-electron lifetimes in TiO2 nanotubes of the order of tens of picoseconds. These lifetimes are surprisingly short compared to those determined in films of TiO2 nanoparticles. Samples of ordered nanotube arrays with several different tube wall thicknesses were fabricated by anodization and have been investigated by means of optical-pump-terahertz-probe (OPTP) spectroscopy, which allows measurement of transient photoinduced conductivity with picosecond resolution. Our results indicate a two-stage decay of the photoexcited electron population. We attribute the faster component to temporary immobilization of charge in shallow trap states, from which electrons can detrap again by thermal excitation. The slower component most likely reflects irreversible trapping in states deeper below the conduction band edge. Free-electron lifetimes associated with shallow trapping appear to be independent of the tube wall thickness and have very similar values for electrons directly photoexcited in the material and for those injected from an attached photoexcited dye. These results suggest that trap states are not predominantly located at the surface of the tubes. The effective THz charge-carrier mobility in the TiO2 nanotubes is determined (0.1-0.4 cm2/(Vs)) and found to be within the same range as carrier mobilities reported for TiO2 nanoparticles. Implications for the relative performance of these nanostructures in dye-sensitized solar cells are discussed.
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