The invention relates to a high-voltage LDMOS device, including a substrate, an epitaxial layer is positioned over the substrate, is located in the epitaxial layer on the drain side and on the lower surface and the lower surface of the epitaxial layer overlap of the drift region, a drain region and a source region located in LDMOS devices at both ends of the cross under the surface of the epitaxial layer on the substrate and epitaxial layer the interface is arranged alternately at least one pair of N type semiconductor and P type semiconductor region, surface voltage interface of N type semiconductor and P type semiconductor region and the power device is down parallel to the direction of, the N type semiconductor region and a p type semiconductor region close to the formation of PN junction with each other. The invention has the advantages that the N type semiconductor region in the invention and the P type semiconductor region also known RESURF layer for the body, the body has a lower surface of the LDMOS device layer electric field can effectively solve the existing LDMOS devices to improve the reverse voltage and reduce the turn-on resistance of contradiction.
【技术实现步骤摘要】
本专利技术涉 及电子
内的半导体高压低阻器件,尤其涉及在体硅上制造的高压功率器件。
技术介绍
随着半导体行业的迅猛发展,PIC(Power Integrated Circuit,功率集成电路)不断在多个领域中使用,如电机控制、平板显示驱动控制、电脑外设的驱动控制等等,PIC电路中所使用的功率器件中,LDMOS (Lateral Double Diffused M0SFET,横向双扩散金属氧化物半导体场效应管)高压器件具有工作电压高、工艺简单、易于同低压CMOS (Complementary Metal Oxide Semiconductor,互补金属氧化物半导体)电路在工艺上兼容等特点而受到广泛关注。但是对于用Si (硅)材料制成的半导体高压功率器件,LDMOS器件的正向导通电阻相比于VDMOS (Vertical Double Diffused M0SFET,垂直双扩散金属氧化物半导体场效应晶体管)的大,而较大的正向导通电阻导致了器件尺寸的增大,从而增加了制造成本。图 1是N外延的常规LDMOS器件结构示意图,图中,LDMOS器件包括衬底1、外延层2、漂移区 3、漏区4、阱区5、源区6、漏极7、源极8、栅极9,衬底1为ρ型,外延层2为η型。当LDMOS 器件为η型时,阱区5为ρ型,漂移区3为η—型,漏区4、源区6为η+型,反之;当LDMOS器件为P型时,阱区5为η型,漂移区3为ρ—型,漏区4、源区6为ρ+型。图2是P外延的常规N沟道LDMOS器件结构示意图,图中,LDMOS器件包括衬底1、外延层2、漂移区3、漏区4、 源区6、漏极7、源极8、栅极 ...
【技术保护点】
1.一种高压LDMOS器件,包括衬底(1)、位于衬底(1)之上的外延层(2),位于外延层(2)之上靠漏区(4)一侧且下表面与外延层(2)的下表面重合的漂移区(3),位于LDMOS器件两端的漏区(4)和源区(6),其特征在于,在衬底(1)和外延层(2)的交界面上跨过外延层(2)的下表面具有交替排列的至少一对n型半导体区(10)和p型半导体区(11),n型半导体区(10)和p型半导体区(11)的交接面与所述功率器件工作时的表面电压降方向平行,所述n型半导体区(10)和p型半导体区(11)紧贴排列相互形成PN结。
【技术特征摘要】
【专利技术属性】
技术研发人员:方健,陈吕赟,管超,王泽华,吴琼乐,柏文斌,杨毓俊,黎俐,
申请(专利权)人:电子科技大学,
类型:发明
国别省市:90
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