Stochastic modeling of mushroom—waveguide photodetectors

Waveguide photodetectors (WGPDs) are one of the promising candidates to solve the tradeoff between the quantum efficiency and the transit time in the surface illuminated photodiodes where the lightwave is incident laterally perpendicular to the direction of the flow of generated carriers, enhancing both high speed and quantum efficiency. In Mushroom-WGPDs, the performance degradation due its parasitic capacitance and the load resistance is overcome due to the mesa mushroom structure. Inaccuracies in the dimensions of’Mushroom-WGPDs due to the fabrication affect its functionality and its operating bandwidth. In this work, a stochastic analysis of the Mushroom-WGPD that is based on Drift Diffusion model and Monte Carlo simulations is presented. The tolerances of the dimensions of the Mushroom-WGPD and their impacts on the photodetector performance and bandwidth-biasing are studied for different biasing. Both the standard deviations and the probability distribution function of bandwidth are studied. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.