05-01-2017 дата публикации
Номер: US20170003165A1
An image sensor with an array of pixels is provided. In order to achieve high image quality, it may be desirable to improve well capacity of individual pixels within the array by forming deep photodiodes in a thick substrate. When forming the array of pixels, conductive contacts may be formed in a back surface of the substrate opposing ground contacts located on a front side of the substrate. A conductive grid layer may be formed over the conductive contacts. A color filter layer may be formed over the conductive grid layer that may include a barrier grid in which color filter material is deposited. The conductive grid layer and conductive contacts may be biased to a voltage to improve the strength of electric fields in the substrate. Conductive contacts will thereby improve charge collection and electrical isolation and prevent electrical crosstalk and blooming. 1. An electronic device having an array of image sensor pixels , comprising:photosensitive elements formed in a semiconductor substrate having first and second opposing surfaces;conductive contacts formed in the first surface of the semiconductor substrate;a conductive layer formed over the conductive contacts;a color filter array formed on the first surface of the semiconductor substrate;an array of microlenses formed over the color filter array; andground contacts formed on the second surface of the semiconductor substrate.2. The electronic device defined in claim 1 , further comprising:a bond pad formed at an edge of the array of image sensor pixels; anda wire bond coupled between the bond pad and external voltage supply circuitry, wherein the external voltage supply circuitry is configured to apply a voltage to the conductive layer.3. The electronic device defined in claim 1 , further comprising:a conductive via that is formed in the semiconductor substrate at an edge of the array of image sensor pixels and that is coupled between the conductive layer and external voltage supply circuitry, wherein the ...
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