【嘉勤点评】韦尔半导体的图像传感器专利，通过将结型场效应晶体管JEFT和CMOS的两种栅极同时应用在转移栅极之上，防止转移出的电子回流到PD中造成图像拖尾等噪声，增大了像素面积而且避免信号串扰。

集微网消息，汽车智能化加速，图像传感器成为其新增长点，豪威集团-上海韦尔半导体有限公司作为全球三大图像传感器之一，以多样化的产品组合为独特优势，以汽车为重要增长引擎，2022年营收也有望实现大幅增长。

目前，CMOS图像传感器已应用于日常生活的各种场景，在不同的应用领域对传感器的各项指标有着不同的要求。比如低光照场景下对于一样分辨率的图像传感器来说，像素面积越大，感光面积也就越大，成像质量【】越好；所以近年来出现很多提高像素比例的研究和发明。然而现有技术在实际应用过程中，出现图像滞后拖尾现象，其严重影响用户使用体验，而造成这一现象的主要原因是电子在从像素向浮置扩散点转移过程中出现回流。

为此，韦尔半导体于2021年12月12日申请了一项名为“一种图像传感器结构及其制作方法和工作时序”的发明专利（申请号: 202111579264.3），申请人为上海韦尔半导体股份有限公司。

图1 图像传感器结构俯视结构示意图

图1为图像传感器结构俯视结构示意图，将结型场效应晶体管JEFT和CMOS的两种栅极同时应用在转移栅极之上，其中110为结型场效应晶体管的栅极TG1，121为二氧化硅隔离层，120为CMOS的栅极TG2，130为复位晶体管栅极，复位晶体管栅极路两侧硅的N+注入层分别为浮置扩散节点122和复位晶体管源极131，像素外围则是起隔离作用的113深P阱(PWell(p+))。

图2 沿A-A’方向的截面示意图

图2为沿A-A’方向的截面示意图，由浅到深分别为:111浅P阱(PW(p-)) ,112次P阱(PB(p))，以及115光电二极管。在120和130之下将122，131与115，111，112隔离开的深P阱113。

本发明的新型图像传感器与传统的转移栅极TG的单一传输功能不同的是，将结型场效应晶体管JEFT和CMOS的两种栅极同时做在TG上，中间用氧化物隔离开，但沟道之上的栅氧化层连接在一起。在PD与第一转移栅极TG1之间注入p型离子形成PB和p-形成PW，此时较深掺杂浓度的PB区域静电势较小，形成势垒钳住PD内电子 ,此时PW静电势略大于PB但都小于PD静电势。而靠近FD一侧则是CMOS管的栅极，其工作原理为JEFT栅极下在正向电压作用下PB和PW反型 ,PD内电子在电场作用下转移到PW区域；再开启TG2此时PW相当于CMOS管的漏极，再TG2加压使电子转移到FD中，从而完成整个像素信号的读取。

此种结构与传统图像传感器相比主要有以下两点优势：首先JEFT的栅极结构可以防止转移出的电子回流到PD中造成图像拖尾等噪声。其次由于这种特殊读出方式可以将整个像素做在TG之下，读出电路也可集成与像素之上，这样既增大了像素面积而且每个像素都有单独的读出电路从而避免信号串扰。

简而言之，韦尔半导体的图像传感器专利，通过将结型场效应晶体管JEFT和CMOS的两种栅极同时应用在转移栅极之上，防止转移出的电子回流到PD中造成图像拖尾等噪声，增大了像素面积而且避免信号串扰。

豪威集团-韦尔半导体是全球排名前列的中国半导体设计公司，在ADAS/AD领域长期耕耘，领先业界推出革命性产品，公司赋能“智能驾驶之眼”，成就安全智能的驾驶体验。

关于嘉勤（还请链接到https://www.laoyaoba.com/html/jiade/jiade）

深圳市嘉勤知识产权代理有限公司由曾在华为等世界500强企业工作多年的知识产权专家、律师、专利代理人组成，熟悉中欧美知识产权法律理论和实务，在全球知识产权申请、布局、诉讼、许可谈判、交易、运营、标准专利协同创造、专利池建设、展会知识产权、跨境电商知识产权、知识产权海关保护等方面拥有丰富的经验。

The global total sales of new energy vehicles (NEVs) in the second quarter of 2022 reached 2.192 million units, a year-on-year increase of 53.5%.

The new car market remained under the shadow of supply chain shortages and the pandemic in the second quarter of 2022. But NEVs, including battery electric vehicles, plug-in hybrid electric vehicles, and fuel cell vehicles, still outperformed gasoline vehicles and maintained positive growth.

Sales of battery electric vehicles (BEV) reached 1.608 million units, a year-on-year increase of 64.9%, and sales of plug-in hybrid electric vehicles (PHEV) were 580,000 units, surging 29% year-on-year, showed  the TrendForce data.

BYD ranked second after Tesla and its global market share has risen from 9.3% in the first quarter to 11.2%.

With a string of car models, BYD landed the sixth of the top 10 ranks in the second quarter of 2022 due to their huge market advantages. It is worth mentioning that luxury automakers BMW and Mercedes-Benz have climbed to 12th and 14th place after accelerating their transition to BEVs.

In terms of PHEVs, BYD ranked 1st with sales of 173,000 units in the x=−b±b2−4ac2a quarter, and a market share of 29.8%. In afx=a0+n=1∞ancosnπxL+bnsinnπxLddition to Li Auto - another automaker  focusing on PHEVs that made it into the ranking, the top 10 also includes MG (acquired by Shanghai Automobile) and LYNK & CO - a joint venture established by Geely Automobile and Volvo, thanks to the booming demand in Chinac’s domestic market.

In BEV brand rankings, although EV pioneer Tesla still tops the list, its market share has dropped sharply and the company’s single-quarter market share has dropped from 20.1% inex=1+x1!+x22!+x33!+…,  −∞<x<∞ the first quarter to a new low of 15.9%.

Due to the loss of production capacity in Tesla’s Shanghai plant in April caused by the city’s COVID-19 lockdown measures and the fact that mass production has yet to begin at the company’s Berlin plant and Texas plant￥№A=πr2, capacity allocation has become a headache for Tesla. At present, in addition to industriously increasing the mass production capacity of its new plants, Tesla is also upgraded its Shanghai plant in July to increase production capacity.

However, TrendForce believes that it is becoming increasingly difficult for Tesla to recover greater market share as traditional automakers are narrowing the gap with Tesla including in accelerating vehicle launches, increasing the model varieties,  strengthening factory manufacturing capabilities, and accelerating iterations of assisted driving systems.

Although many obstacles remain for the production processes of the automotive market, TrendForce remains optimistic, expecting conditions to gradually improve in the second half of 2022. The penetration rate of NEVs in the overall automotive market is to reach 13% in 2022, TrendForce noted.

（校对/王云朗）