Prof Laura Herz FRS: Publications

Ultrafast charge separation at a polymer-single-walled carbon nanotube molecular junction.

Nano Lett 11:1 (2011) 66-72

Authors:

Samuel D Stranks, Christian Weisspfennig, Patrick Parkinson, Michael B Johnston, Laura M Herz, Robin J Nicholas

Abstract:

We have investigated the charge photogeneration dynamics at the interface formed between single-walled carbon nanotubes (SWNTs) and poly(3-hexylthiophene) (P3HT) using a combination of femtosecond spectroscopic techniques. We demonstrate that photoexcitation of P3HT forming a single molecular layer around a SWNT leads to an ultrafast (∼430 fs) charge transfer between the materials. The addition of excess P3HT leads to long-term charge separation in which free polarons remain separated at room temperature. Our results suggest that SWNT-P3HT blends incorporating only small fractions (1%) of SWNTs allow photon-to-charge conversion with efficiencies comparable to those for conventional (60:40) P3HT-fullerene blends, provided that small-diameter tubes are individually embedded in the P3HT matrix.

Energy Transfer in Single-Stranded DNA-Templated Stacks of Naphthalene Chromophores

JOURNAL OF PHYSICAL CHEMISTRY C 115:21 (2011) 10550-10560

Authors:

Amy L Stevens, Pim GA Janssen, Amparo Ruiz-Carretero, Mathieu Surin, Albertus PHJ Schenning, Laura M Herz

Surface Energy Relay Between Cosensitized Molecules in Solid-State Dye-Sensitized Solar Cells

JOURNAL OF PHYSICAL CHEMISTRY C 115:46 (2011) 23204-23208

Authors:

Michael D Brown, Patrick Parkinson, Tomas Torres, Hidetoshi Miura, Laura M Herz, Henry J Snaith

Characterisation of nanostructures via terahertz spectroscopy

Conference on Optoelectronic and Microelectronic Materials and Devices Proceedings COMMAD (2010) 23-24

Authors:

P Parkinson, HJ Joyce, X Xu, Q Gao, HH Tan, C Jagadish, LM Herz, MB Johnston

Abstract:

We have used terahertz spectroscopy to measure the conductivity and time-resolved photoconductivity of a range of semiconducting nanostructures. This article focuses on our recent terahertz conductivity studies on semiconductor nanowires and single walled carbon nanotubes. © 2010 IEEE.

The role of ultrafast torsional relaxation in the emission from polythiophene aggregates

Conference on Optoelectronic and Microelectronic Materials and Devices, Proceedings, COMMAD (2010) 117-118

Authors:

P Parkinson, C Müller, N Stingelin, MB Johnston, LM Herz

Abstract:

An understanding of aggregation effects in organic semiconductors is essential for their effective use in optoelectronic devices. Typically, the electronic dynamics in such systems are heavily dependant upon the aggregation state, and dynamics often occur on sub-nanosecond timescales. © 2010 IEEE.

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