Seminar for PhD students given by: Félix Bardonnet

Seminar for PhD students given by Félix Bardonnet of the Nanophotonics group on October 28, 2021 at 1:15 pm, in videoconference, on the theme: "Pixels with microstructures: how to reinforce the efficiency of silicon sensors in the near infrared?".

Abstract: " Due to their low-cost fabrication process and high efficiency, silicon-based Complementary Metal Oxide Semiconductor (CMOS) image sensors are the reference in term of detection in the visible range. However, their optical performances are toughly degraded in the Near Infrared (NIR). For such wavelengths, Silicon has a small absorption coefficient, leading to a very poor Quantum Efficiency (QE). A solution to improve it is to implement structures like pyramids that are etched in the Silicon layer. This will lead to diffraction inside the photodiode, enhancing the light path and therefore the absorption. Using Finite Difference Time Domain (FDTD) simulations, we demonstrated a huge QE enhancement at 940nm by implementing this kind of diffractive structures and these results were then confirmed by characterizations."