Professor Robert Taylor: Publications

Mitigating the photocurrent persistence of single ZnO nanowires for low noise photodetection applications

(2019)

Authors:

J ph Girard, L Giraudet, S Kostcheev, B Bercu, TJ Puchtler, RA Taylor, C Couteau

Unravelling the key role of surface features behind facet-dependent photocatalysis of anatase TiO2

Chemical Communications Royal Society of Chemistry 55:30 (2019) 4415-4418

Authors:

Y-K Peng, B Keeling, Yiyang Li, Jianwei Zheng, Tianyi Chen, H-L Chou, TJ Puchtler, Robert Taylor, Shik Tsang

Abstract:

The high activity of nanocrystallites is commonly attributed to the terminal high-energy facets. However, we demonstrate that the high activity of the anatase TiO2(001) facet in photocatalytic H2 evolution is not due to its high intrinsic surface energy, but local electronic effects created by surface features on the facet.

Photonic molecules defined by SU-8 photoresist strips on a photonic crystal waveguide

Optics Express Optical Society of America (2018)

Authors:

ROBERT TAYLOR, S Lennon, F Brossard, L Nuttall, J Wu, J Griffiths

Nitride Single Photon Sources

2018 IEEE PHOTONICS CONFERENCE (IPC) (2018)

Authors:

T Zhu, JC Jarman, Christopher X Ren, Fengzai Tang, CC Kocher, TJ Puchtler, Benjamin PL Reid, T Wang, Saroj K Patra, Stefan Schulz, Robert A Taylor, RA Oliver

Mitigating the photocurrent persistence of single ZnO nanowires for low noise photodetection applications.

Nanotechnology (2018)

Authors:

Jean-Philippe Girard, Louis Giraudet, Sergei Kostcheev, Bogdan Bercu, Timothy J Puchtler, Robert Taylor, Christophe Couteau

Abstract:

In this work, we investigate the optoelectronic properties of zinc oxide (ZnO) nanowires, which are good candidates for applications based on integrated optics. Single ZnO nanowire photodetectors were fabricated with ohmic contacts. By taking current transient measurements in different atmospheres (oxygen, air, vac- uum and argon), and at various temperatures, we point out the importance of surface effects on the electrical behaviour. Results confirm that oxygen chemisorption is responsible for the existence of a high photocon- ductive gain in these devices, and for the first time a two step process in the photocurrent rise transient is reported. A maximum gain of G = 7.8 × 10^7 is achieved. However, under certain conditions, the persistence of the photocurrent can last up to several hours and as such may prevent the device from operating at useful rates. From a knowledge of the photocurrent response mechanisms, we establish a method to restore the pho- todetector to its initial state, with very low dark current, by applying an appropriate gate voltage sequence. This advances the state of the art for these detectors towards commercial applications.

51��