| EPSRC Reference: |
GR/K07805/01 |
| Title: |
THEORETICAL AND EXPERIMENTAL STUDIES OF METAL-SEMICONDUCTOR-METAL ULTRAFAST PHOTODETECTORS |
| Principal Investigator: |
Walker, Professor AB |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Sch of Physics |
| Organisation: |
University of East Anglia |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 October 1994 |
Ends: |
31 January 1997 |
Value (£): |
156,005
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| EPSRC Research Topic Classifications: |
| Optoelect. Devices & Circuits |
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Summary on Grant Application Form |
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Overall: investigation of the physics of Metal-Semiconductor-Metal photodetectors, focussing on transient response on picosecond time scales. Specific:(i) To look at GaAs samples of contact separation 0.5-50 microns of various geometries.(ii) To explore speed-up of response caused by partial illumination.(ii) To explore the influence of quantum wells and to model detectors made with Low Temperature grown (LT) GaAs.Progress:Theoretical Investigations at UEAA one and two-dimensional drift diffusion code has been written by the RA employed on the grant since 1 October 1994 which will address the main objective. The code simulates electron and hole transport through a photodetector, where the carriers are produced by light shining on the detector. It is based on the one-dimensional drift diffusion code developed for the project funded by EPSRC grant GR/G49067 and reproduces the results from that code 1 .Objective (i) is being fulfilled via simulations of photodetectors with varying finger separation to aid the interpretation of results generated by Dr. J. Allams group at Hitachi Laboratory Cambridge 2 .Objective(ii) is being addressed via comparisons of our results with experimental data on sub-picosecond pulse generation by nonuniform illumination of transmission line gaps of Alexandrou et at 3 .Objective(iii) will be addressed by including the possibility for trapping in the code. Development of a two-dimensional Monte Carlo code that can look at hot electron effects and the implications of different incident light intensities for photodetectors is being deferred until preliminary results have been obtained with the drift diffusion code.References:1. G.M. Dunn, A.B.Walker, A.J. Vickers and V.R. Wicks preprint provisionally accepted by J App Phys.2. N. de B. Baynes, J. Allam, J.R.A. Cleaver and K. Ogawa, preprint to be submitted to App Phys Letters.3. S. Alexandrou, C-C. Wang, R. Sobolewski and T.Y. Hsiang, preprint. Experimental Investigations at Essex.
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Key Findings |
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Potential use in non-academic contexts |
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.uea.ac.uk |