A Channel Stop Defined, Barrier And Drain Antiblooming Structure For Virtual Phase Ccd Image Sensors

W. F. Keenan; H. H. Hosack

doi:10.1117/12.940185

1 April 1987 A Channel Stop Defined, Barrier And Drain Antiblooming Structure For Virtual Phase Ccd Image Sensors

W. F. Keenan, H. H. Hosack

Proceedings Volume 0765, Imaging Sensors and Displays; (1987) https://doi.org/10.1117/12.940185
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

A new barrier and drain antiblooming architecture has been developed for virtual phase CCD image sensors. In this structure the drain is isolated from the pixel wells by the channel stop implant except in the antiblooming control region, where it is the same as the normal pixel barrier which exists along the direction of charge transfer. In addition, in this structure the drain is placed beneath the virtual electrode to eliminate low voltage breakdown effects. The unique organization of this structure allows the same potential levels to be used in both the antiblooming barrier and the transfer barrier. This multiple use of the same potential region greatly simplifies the processing needed for this type of device. The structure is formed by the process steps normally used to fabricate the sensor without antiblooming, except for one additional ion implant and pattern level to form the antiblooming drain. The antibooming action is continuous during integration and readout, and has extremely high overload tolerance. These features make this structure the preferred form of antiblooming for applications which have very high overload, such as flash lamp illumination. The process economy inherent in this anti-blooming structure results in higher sensor yields and lower manufacturing costs.

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W. F. Keenan and H. H. Hosack "A Channel Stop Defined, Barrier And Drain Antiblooming Structure For Virtual Phase Ccd Image Sensors", Proc. SPIE 0765, Imaging Sensors and Displays, (1 April 1987); https://doi.org/10.1117/12.940185

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KEYWORDS

Sensors

CCD image sensors

Modulation transfer functions

Charge-coupled devices

Lamps

Electrodes

Image sensors

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