Poisson_CCD output plot of a basic MIRI detector model simulation. Top left: Poisson’s equation solved for a five-by-five grid of pixels; a localized voltage de-bias of −1.5 V is applied at the middle pixel. Top right: electrostatic potential as a function of detector depth. Z = 0 µm is located at the pixel, and Z = 35 µm is located at the top of the buried contact. Bottom: MIRI detector infrared-active layer. The blue shading shows areas where the active layer is fully depleted. Yellow and red shading show areas where the active layer is un-depleted. The buried contact is located at Z = 34–35 µm. The dark red boxes at Z = 0–1 µm illustrate the regions not covered by the detector front side contact.