Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of reducing CIS (CMOS Image Sensor) dark current through optimizing posterior optical channel process

A light channel and dark current technology, applied in photovoltaic power generation, circuits, electrical components, etc., can solve the problems of H ion overflow and SiO2/Si interface state cannot be repaired, etc., to achieve the effect of improving dark current

Active Publication Date: 2017-02-15
SHANGHAI HUALI MICROELECTRONICS CORP
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The non-SiO2 layer (including NDC and SIN) above the photodiode of CIS (CMOS Image Sensor, CMOS image sensor) products is usually removed to reduce the loss of incident light due to refraction between different materials, but on the other hand, loss With the protection of SiCN (NDC, Nitrogen Doped silicon Carbide) or SIN, H ions are easy to overflow so that the SiO2 / Si interface state cannot be repaired, and eventually dark current is generated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of reducing CIS (CMOS Image Sensor) dark current through optimizing posterior optical channel process
  • Method of reducing CIS (CMOS Image Sensor) dark current through optimizing posterior optical channel process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] In order to make the content of the present invention clearer and easier to understand, the content of the present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

[0019] Theoretical studies have shown that SiO 2 / Si interface state is the main source of dark current in CIS, and H+ ions can pass through the SiO 2 The dangling bond combination in the / Si interface makes it inactive and reduces the dark current. However, H+ ions are easy to overflow during heat treatment, and the SiO 2 Not dense enough to prevent overflow of H+ ions. figure 1 A schematic structural diagram of a photodiode region of a CIS device in the prior art is schematically shown. The back-end material of normal CIS products contains SiO 2 (Dielectric SiO 2 Layer 10, passivation layer covered with SiO 2 layer 30), SICN (rear dielectric SICN layers 21, 22, 23, 24) and SIN (passivation layer covering SIN layer 20, top SIN material 40...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method of reducing CIS (CMOS Image Sensor) dark current through optimizing a posterior optical channel process. In the method of reducing the CIS dark current through optimizing the posterior optical channel process of the invention, a CIS photodiode region is formed, an SICN material is removed completely in a posterior dielectric SiO2 layer, and an SI3N4 material is selectively kept at the top of the CIS photodiode region.

Description

technical field [0001] The invention relates to the field of semiconductor manufacturing, and more specifically, the invention relates to a method for optimizing the back-end optical channel process to reduce CIS dark current. Background technique [0002] The non-SiO2 layer (including NDC and SIN) above the photodiode of CIS (CMOS Image Sensor, CMOS image sensor) products is usually removed to reduce the loss of incident light due to refraction between different materials, but on the other hand, loss With the protection of SiCN (NDC, Nitrogen Doped silicon Carbide) or SIN, H ions are easy to overflow, so that the SiO2 / Si interface state cannot be repaired, and finally dark current is generated. [0003] How to keep the dense layer so that the H ions will not overflow to improve the dark current and at the same time not affect the luminous flux becomes a problem. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0392H01L31/18
CPCH01L31/03923H01L31/18Y02E10/541
Inventor 张武志
Owner SHANGHAI HUALI MICROELECTRONICS CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com