GaNUV detectors for synchrotron-based protein structure studies

Blue, A. , Grant, J. , Cunningham, W., Quarati, F., Smith, K.M., Rahman, M., O'Shea, V. and Manolopoulos, S. (2005) GaNUV detectors for synchrotron-based protein structure studies. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 546, pp. 131-134. (doi:10.1016/j.nima.2005.03.115)

Blue, A. , Grant, J. , Cunningham, W., Quarati, F., Smith, K.M., Rahman, M., O'Shea, V. and Manolopoulos, S. (2005) GaNUV detectors for synchrotron-based protein structure studies. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 546, pp. 131-134. (doi:10.1016/j.nima.2005.03.115)

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Abstract

AlGaN and GaN have been investigated as UV detector materials for applications in protein structure studies. I– V characteristics performed on the material using concentric contacts showed 4 orders of magnitude of greater dark current for the Al0:1Ga0:9N than for the GaN. Subsequently, interdigitated metal–semiconductor–metal (MSM) photodetectors were successfully fabricated on GaN. No changes in levels of dark surrent were recorded using varying metal electrodes with similar work functions (Pd and Au). The unbiased diodes showed a difference of 3 orders of magnitude between dark and photocurrent levels on exposure to UV. The responsivity for diodes with 25 and 100 mm finger separation operated in unbiased mode was around 100 mA/W and was flat over the bandgap. These results show a responsivity in agreement with those from previous measurements for biased GaN photodetectors [Phys. Stat. Solid: 176 (1999) 157]. Using these results, a design for an unbiased GaN detector to be used for protein structure studies is proposed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:O'Shea, Professor Valentine and Grant, Dr James and Cunningham, Dr William and Blue, Dr Andrew and Smith, Professor Kenway
Authors: Blue, A., Grant, J., Cunningham, W., Quarati, F., Smith, K.M., Rahman, M., O'Shea, V., and Manolopoulos, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
ISSN:0168-9002
ISSN (Online):1872-9576

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