FDTD simulation of compositionally graded HgCdTe photodetectors
| Autor: | Marco Vallone, H. Figgemeier, Giovanni Ghione, Michele Goano, Francesco Bertazzi, Stefan Hanna, D. Eich |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
FDTD HgCdTe LWIR Photodetector Numerical simulation 02 engineering and technology 01 natural sciences 010309 optics Focal plane arrays Interference (communication) Atomic and Molecular Physics Compositional grading Infrared detectors Electronic Optical and Magnetic Materials Atomic and Molecular Physics and Optics Condensed Matter Physics 0103 physical sciences Electronic Optical and Magnetic Materials Computer simulation Detector Finite-difference time-domain method 021001 nanoscience & nanotechnology Cutoff frequency Computational physics Quantum efficiency Ray tracing (graphics) and Optics 0210 nano-technology |
| Zdroj: | Infrared Physics & Technology. 97:203-209 |
| ISSN: | 1350-4495 |
| DOI: | 10.1016/j.infrared.2018.12.041 |
| Popis: | The ability to simulate HgCdTe infrared detectors with realistic alloy composition profiles is essential for their optimization. We give practical guidelines for the realization of combined three-dimensional, realistic full-wave electromagnetic and electrical modeling for the description of detectors with compositionally-graded layers, suitable to most available numerical solvers. Following the known procedure to sample the compositionally-graded layers into a number N of sublayers, we assess the effects of different choices for N, both on calculation accuracy and computational cost. Quantum efficiency spectra calculated with the proposed approach are compared with those determined through two shortcuts: ray tracing, based on classical optics, and full-wave simulation where graded layers are replaced by constant, spatially-averaged optical properties. It is shown that the former is not generally a valid alternative, since it does not address interference effects due to back-reflections, while the latter can lead to incorrect estimates of the detector cutoff wavelength. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect