SOI pixel detector based on CMOS time-compression charge-injection

Durini, Daniel; Brockherde, W.; Hosticka, B.J.

doi:10.1109/ecctd.2007.4529754

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Charge‐injection photogate pixel fabricated in CMOS silicon‐on‐insulator technology

Durini

Brockherde

Hosticka

2008

Circuit Theory & Apps

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SUMMARYConcept, theoretical analysis, and experimental results obtained from a charge-injection photogate (CI-PG) pixel detector fabricated in CMOS silicon-on-insulator (SOI) technology are presented. The charge collected in the photodetector during a certain charge collection (integration) time is injected into the substrate for readout. This readout principle presents a huge internal photocurrent amplification (∼ 10 4 ) taking place in the photodetector, obtained through the 'time-compression' approach. Here, the readout circuitry is fabricated on highly doped, 200 nm thick, SOI film, while the photogate detector is fabricated on higher resistivity handle-wafer. The latter, together with the 30 V biasing possibilities, enhances the quantum efficiency of the pixel, especially for irradiations with wavelengths in the near-infra-red part of the spectra.

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