Omnivision Technologies, Inc.

Koninklijke Philips Corporation N.v.

Nxp B.v.

Interuniversitair Microelektronica Centrum (imec)

Vincent Venezia

Duli Mao

Hsin-Chih Tai

Howard E Rhodes

Yin Qian

Gang Chen

Dyson Hsinchih Tai

Keh-Chiang Ku

Sohei Manabe

Chih-Wei Hsiung

Wei Zheng

Dajiang Yang

Ashish A Shah

Rongsheng Yang

Lindsay Alexander Grant

Kazufumi Watanabe

Young Woo Jung

Wei Dong Qian

Keiji Mabuchi

Eric A G Webster

Hidetoshi Nozaki

Sing-Chung Hu

Yuanliang Liu

Satyadev Hulikal Nagaraja

Chia-Ying Liu

Bowei Zhang

WeiDong Qian

Boyd Fowler

Bill Phan

Radu Surdeanu

Seong Yeol Mun

Oray Orkun Cellek

Zhiqiang Lin

Dyson Hsin-Chih Tai

Manoj Bikumandla

Takayuki Goto

Yukiko Furukawa

Sang Joo Lee

Chin-Poh Pang

Zhibin Xiong

Geunsook Park

Hsin Chih Tai

Florence Nathalie Cubaynes

Chun-Yung Ai

Electrical Phase Detection Auto Focus. In one embodiment, an image sensor includes a plurality of pixels arranged in rows and columns of a pixel array disposed in a semiconductor material. Each pixel includes a plurality of photodiodes configured to receive incoming light through an illuminated surface of the semiconductor material. The plurality of pixels includes at least one autofocusing phase detection (PDAF) pixel having: a first subpixel without a light shielding, and a second subpixel without the light shielding. Autofocusing of the image sensor is at least in part determined based on different electrical outputs of the first subpixel and the second sub pixels.

Electrical phase detection auto focus

A multi-pixel detector of an image sensor is described. The multi-pixel detector includes a first photodiode region disposed within a semiconductor substrate to form a first pixel, a second photodiode region disposed within the semiconductor substrate to form a second pixel adjacent to the first pixel, and a partial isolation structure extending from a first side of the semiconductor substrate towards a second side of the semiconductor substrate between the first photodiode region and the second photodiode region. A length of a lateral portion of the partial isolation structure between the first photodiode region and the second photodiode region is less than a lateral length of the first photodiode region.

Image sensor with multi-pixel detector and partial isolation structure

A pixel cell includes a plurality of subpixels to generate image charge in response to incident light. The subpixels include an inner subpixel laterally surrounded by outer subpixels. A first plurality of transfer gates disposed proximate to the inner subpixel and a first grouping of outer subpixels. A first floating diffusion is coupled to receive the image charge from the first grouping of outer subpixels through a first plurality of transfer gates. A second plurality of transfer gates disposed proximate to the inner subpixel and the second grouping of outer subpixels. A second floating diffusion disposed in the semiconductor material and coupled to receive the image charge from each one of the second grouping of outer subpixels through the second plurality of transfer gates. The image charge in the inner subpixel is received by the first, second, or both floating diffusions through respective transfer gates.

High dynamic range split pixel CMOS image sensor with low color crosstalk

Backside illuminated sensor pixel structure. In one embodiment, and image sensor includes a plurality of pixels arranged in rows and columns of a pixel array that are disposed in a semiconductor substrate. Individual photodiodes of the pixel array are configured to receive an incoming light through a backside of the semiconductor substrate. A front side of the semiconductor substrate is opposite from the backside. A plurality of transistors disposed proximate to the front side of the semiconductor substrate, are arranged in a row along an outer perimeter of the photodiodes of the respective pixel; and a plurality of isolation structures arranged to bracket the row of transistors along the outer perimeter of the photodiodes. A plurality of contacts electrically contacting the plurality of isolation structures, and the contacts are configured to voltage-bias the plurality of isolation structures.

Negatively biased isolation structures for pixel devices

Image sensor includes a first semiconductor material and a plurality of first doped regions disposed in the semiconductor material. The plurality of first doped regions is part of a plurality of photodiodes to receive light and convert the light into image charge. A second semiconductor material is disposed on the first semiconductor material, and a plurality of second doped regions is disposed in the second semiconductor. The plurality of second doped regions is electrically coupled to the plurality of first doped regions, and the plurality of second doped regions is part of the plurality of photodiodes.

Small-pitch image sensor

An image sensor pixel array comprises a center region and two parallel edge regions, wherein the center region is between the two parallel edge regions. The center region comprises a plurality of image pixels disposed along first sub-array of rows and columns, wherein each of the plurality of image pixels comprises a first micro-lens (ML) formed at an offset position above a first light receiving element as a countermeasure for shortening of exit pupil distance of the image pixel in the center region, and each of the two parallel edge regions comprises a plurality of phase detection auto-focus (PDAF) pixels disposed along second sub-array of rows and columns, wherein each of the plurality of PDAF pixels comprises a second micro-lens (ML) formed at an alignment position above a second light receiving element; and at least one of the PDAF pixels is located at a distance away from center of the edge region to receive incident light along an injection tilt angle.

Image sensors with phase detection auto focus pixels

An image sensor includes a plurality of photodiodes disposed in a semiconductor material to convert image light into image charge. A floating diffusion is disposed proximate to the plurality of photodiodes to receive the image charge from the plurality of photodiodes. A plurality of transfer transistors is coupled to transfer the image charge from the plurality of photodiodes into the floating diffusion in response to a voltage applied to the gate terminal of the plurality of transfer transistors. A first trench isolation structure extends from a frontside of the semiconductor material into the semiconductor material and surrounds the plurality of photodiodes. A second trench isolation structure extends from a backside of the semiconductor material into the semiconductor material. The second trench isolation structure is disposed between individual photodiodes in the plurality of photodiodes.

Image sensor with dual trench isolation structures at different isolation structure depths

An avalanche photodiode has a first diffused region of a first diffusion type overlying at least in part a second diffused region of a second diffusion type; and a first minority carrier sink region disposed within the first diffused region, the first minority carrier sink region of the second diffusion type and electrically connected to the first diffused region. In particular embodiments, the first diffusion type is N-type and the second diffusion type is P-type, and the device is biased so that a depletion zone having avalanche multiplication exists between the first and second diffused regions.

Apparatus and method for single-photon avalanche-photodiode detectors with reduced dark count rate

A photon detection device includes a single photon avalanche diode (SPAD) disposed in a semiconductor layer. A guard ring structure is disposed in the semiconductor layer surrounding the SPAD to isolate the SPAD. A well region is disposed in the semiconductor layer surrounding the guard ring structure and disposed along an outside perimeter of the photon detection device. A contact region is disposed in the well region only in a corner region of the outside perimeter such that there is no contact region disposed along side regions of the outside perimeter. A distance between an inside edge of the guard ring structure and the contact region in the corner region of the outside perimeter is greater than a distance between the inside edge of the guard ring structure and the side regions of the outside perimeter such that an electric field distribution is uniform around the photon detection device.

Stacked-chip backside-illuminated SPAD sensor with high fill-factor

An image sensor includes a pixel array having plurality of pixel cells arranged into a plurality of rows and a plurality of columns of pixel cells in a first semiconductor die. A plurality of pixel support circuits are arranged in a second semiconductor die that is stacked and coupled together with the first semiconductor die. A plurality of interconnect lines are coupled between the first and second semiconductor dies, and each one of the plurality of pixel cells is coupled to a corresponding one of the plurality of pixel support circuits through a corresponding one plurality of interconnect lines. A plurality of shield bumps are disposed proximate to corners of the pixel cells in the pixel array and between the first and second semiconductor dies such that each one of the plurality of shield bumps is disposed between adjacent interconnect lines along a diagonal of the pixel array.

Stacked image sensor with shield bumps between interconnects

An image sensor includes a semiconductor material including a photodiode disposed in the semiconductor material and an insulating material. A surface of the semiconductor material is disposed between the insulating material and the photodiode. The image sensor also includes isolation structures disposed in the semiconductor material and in the insulating material, and the isolation structures extend from within the semiconductor material through the surface and into the insulating material. The isolation structures include a core material and a liner material. The liner material is disposed between the core material and the semiconductor material, and is also disposed between the insulating material and the core material.

Through-semiconductor and through-dielectric isolation structure

A method of image sensor fabrication includes forming a photodiode and a floating diffusion in a first semiconductor material, and removing part of an oxide layer disposed proximate to a seed area on a surface of the first semiconductor material. The method also includes depositing a second semiconductor material over the surface of the first semiconductor material, and annealing the first semiconductor material and second semiconductor material. A portion of the second semiconductor material is etched away to form part of a source follower transistor, and dopant is implanted into the second semiconductor material to form a first doped region, a third doped region, and a second doped region. The second doped region is laterally disposed between the first doped region and the third doped region, and the second doped region is a channel of the source follower transistor.

Image sensor with inverted source follower

An image sensor includes a plurality of photodiodes disposed in a semiconductor material between a first side and a second side of the semiconductor material. The image sensor also includes a plurality of hybrid deep trench isolation (DTI) structures disposed in the semiconductor material, where individual photodiodes in the plurality of photodiodes are separated by individual hybrid DTI structures. The individual hybrid DTI structures include a shallow portion that extends from the first side towards the second side of the semiconductor material, and the shallow portion includes a dielectric region and a metal region such that at least part of the dielectric region is disposed between the semiconductor material and the metal region. The hybrid DTI structures also include a deep portion that extends from the shallow portion and is disposed between the shallow portion and the second side of the semiconductor material.

Image sensor with hybrid deep trench isolation

An avalanche photodiode sensor includes a plurality of avalanche photodiodes disposed in a semiconductor material where individual avalanche photodiodes in the plurality of avalanche photodiodes have an internal electric field parallel with a first surface of the semiconductor material. The individual avalanche photodiodes in the plurality of avalanche photodiodes include a p-doped semiconductor region which extends into the semiconductor material, and an n-doped semiconductor region which extends into the semiconductor material. The internal electric field extends between the p-doped semiconductor region and the n-doped semiconductor region. Processing methods as examples are also proposed.

Horizontal avalanche photodiode

An image sensor includes a photodiode disposed in a first semiconductor material and a floating diffusion disposed proximate to the photodiode in the first semiconductor material. A source follower transistor is disposed in part in a second semiconductor material and includes: a first doped region, a third doped region, and a second doped region with an opposite polarity as the first doped region and the third doped region, and a gate electrode coupled to the floating diffusion and disposed in the first semiconductor material and aligned with the second doped region in the second semiconductor material of the source follower transistor.

Growing community of inventors

Los Gatos, CA, United States of America

Vincent Venezia