Photoresponse of photodiode arrays for solid-state image sensors

Abstract

Articles you may be interested inAn effective metals gettering process with a cryogenic carbon implant for CMOS image sensors AIP Conf. Proc. 1496, 265 (2012); 10.1063/1.4766539Near infrared image sensor with integrated germanium photodiodes.Erratum: "The unsaturated photocurrent controlled by two-dimensional barrier geometry of a single ZnO nanowire Schottky photodiode" [Appl.A closed-form analytical expression for diffusion-limited photocurrent in a closely spaced photodiode array is presented with reference to modern CMOS imaging arrays. The analysis makes use of the fact that the current density at the peripheral edges of the photodiode in a closely spaced array has a maximum value near the surface and decays approximately in a linear fashion with the depth into the substrate. The approximated lateral current density at the peripheral edge is then used to derive an expression for the overall peripheral photocurrent. The final expression shows good agreement with the experimental results.

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“…Equation (5) arises from the assumption that the minority carrier concentration eventually decreases to zero at the depth far beyond the optical absorption depth. The solution of (3) is (6) where c1 and c2 that satisfy the boundary conditions of (4) and (5) are…”

“…Normalized excess minority-carrier concentration distribution over the semiconductor depth for = 632 nm, obtained from the 1-D diffusion equation solution [in(6), the equivalent value of d, based on the process data, was taken as 10 L ].…”

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“…The resulting photocurrent across the junction thus has two components: a drift current and a diffusion current [3, 4, 7, 10, 11, 20, 22-24, 26, 40, 43]. The drift component corresponds to charges collected in the depletion layer, and the diffusion current results from charges collected from both quasi-neutral adjacent regions.…”

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“…Electrical crosstalk has been studied extensively. 2,3 Optical crosstalk also has a spectral and a spatial component. 1,4,5 One source of optical crosstalk can be traced to the fact that color filters are located at a considerable distance from the pixel substrate.…”