Planar avalanche photodiodes with edge breakdown suppression using a novel selective area growth based process
| Autor: | M. Hisko, Anthony J. SpringThorpe, O. J. Pitts, G. Bonneville, W. Benyon, C. Storey |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
02 engineering and technology Dielectric Edge (geometry) Epitaxy Curvature 01 natural sciences Inorganic Chemistry 020210 optoelectronics & photonics Planar Optics Electric field 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Materials Chemistry selective epitaxy Diffusion (business) avalanche photodiodes 010302 applied physics business.industry phosphides metalorganic vapor phase epitaxy Condensed Matter Physics Avalanche photodiode semiconducting III-V materials business |
| Popis: | We propose and demonstrate a novel process to fabricate planar avalanche photodiodes using selective area growth (SAG) followed by a single Zn diffusion through the SAG material using the same dielectric mask. The tapered surface profile of the SAG epitaxy due to the enhancement of the growth rate in the vicinity of the mask edge modifies the diffusion profile, resulting in a gradual reduction of the diffusion depth towards the outer edge of the active area. The associated reduction of the electric field counteracts the edge curvature effect sufficiently to suppress edge breakdown. For undoped InP SAG epitaxy, small areas of higher electric field occur where the mask edge is along the [1 0 0] or [0 1 0] directions, associated with the formation of enhanced ridges in the SAG material in these locations. Similar ridges are observed for Si-doped InP and InP/InGaAs/InP SAG structures, but the enhancement of the electric field in these locations is significantly lower. |
| Databáze: | OpenAIRE |
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