Performance and Modeling of the MWIR HgCdTe Electron Avalanche Photodiode
| Autor: | Pradip Mitra, Richard Scritchfield, Mike Goodwin, Martha Ohlson, Jeffrey D. Beck, Lewis Wood, M. R. Skokan, M. A. Kinch, Chang-Feng Wan, Billy Sullivan, J. E. Robinson, Jamie Teherani |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Point spread function Physics::Instrumentation and Detectors business.industry Chemistry Photodetector Condensed Matter Physics Avalanche photodiode Noise figure Electronic Optical and Magnetic Materials Photodiode law.invention chemistry.chemical_compound Electron avalanche Optics law Materials Chemistry Optoelectronics Mercury cadmium telluride Electrical and Electronic Engineering business Diode Dark current |
| Zdroj: | Journal of Electronic Materials. 38:1579-1592 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | The operation of the mid-wave infrared (MWIR) HgCdTe cylindrical electron injection avalanche photodiode (e-APD) is described. The measured gain and excess noise factor are related to the to the collection region fill factor. A 2D diffusion model calculates the time dependent response and steady state pixel point spread function for cylindrical diodes, and predicts bandwidths near 1 GHz for small geometries. A 2 μm diameter spot scan system was developed for point spread function and crosstalk measurements at 80 K. An electron diffusion length of 13.4 μm was extracted from spot scan data. Bandwidth data are shown that indicate bandwidths in excess of 300 MHz for small unit cells geometries. Dark current data, at high gain levels, indicate an effective gain normalized dark density count as low as 1000 counts per μs per cm2 at an APD gain of 444. A junction doping profile was determined from capacitance-voltage data. Spectral response data shows a gain independent characteristic. |
| Databáze: | OpenAIRE |
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