Dual EPI active pixel cell design and method of making the same
First Claim
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1. An active pixel sensor cell comprising:
- a substrate doped at a first concentration and having a top surface;
a plurality of photosensitive devices and logic devices;
a layer doped at a second concentration extending a first distance from the top surface into the substrate beneath at least some of said logic devices; and
said layer doped at a second concentration extending a second distance, which is greater than the first distance, from said top surface into said substrate beneath at least some of said photosensitive devices.
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Abstract
The present invention is a dual epi active pixel sensor cell having a p- region of dual thickness and a method of making the same. The dual epi active pixel sensor cell produces a sensor with improved noise and latch-up reduction and improved red absorption. The thin p- epi region is positioned in the logic region for improved latch-up immunity. The thick p- epi is positioned in the pixel region for improved red absorption.
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8 Claims
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1. An active pixel sensor cell comprising:
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a substrate doped at a first concentration and having a top surface; a plurality of photosensitive devices and logic devices; a layer doped at a second concentration extending a first distance from the top surface into the substrate beneath at least some of said logic devices; and said layer doped at a second concentration extending a second distance, which is greater than the first distance, from said top surface into said substrate beneath at least some of said photosensitive devices. - View Dependent Claims (2, 3, 4)
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5. An active pixel sensor cell device comprising:
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a p- layer of varying thickness; a logic region wherein said p- layer has a first thickness; and a pixel region adjacent to said logic region wherein said p- layer has a second thickness greater than the first thickness. - View Dependent Claims (6, 7, 8)
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Specification