CN104821334B - N型ldmos器件及工艺方法 - Google Patents
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- H—ELECTRICITY
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L29/7816—Lateral DMOS transistors, i.e. LDMOS transistors
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- H01L29/0843—Source or drain regions of field-effect devices
- H01L29/0847—Source or drain regions of field-effect devices of field-effect transistors with insulated gate
- H01L29/0852—Source or drain regions of field-effect devices of field-effect transistors with insulated gate of DMOS transistors
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66674—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/66681—Lateral DMOS transistors, i.e. LDMOS transistors
- H01L29/66689—Lateral DMOS transistors, i.e. LDMOS transistors with a step of forming an insulating sidewall spacer
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Abstract
本发明公开了一种N型LDMOS器件,在P型衬底上具有N型埋层,N型埋层之上为N型深阱;所述N型深阱中具有P阱,P阱中包含有重掺杂P型区以及所述LDMOS器件的源区,硅衬底表面具有栅氧化层及多晶硅栅极;所述N型深阱中还具有LDMOS器件的漏区,引线通过接触孔将重掺杂P型区、源区以及漏区引出;所述的P阱中的重掺杂P型区与源区之间以STI场氧隔离,LDMOS器件的漂移区中漏区两侧具有STI场氧,漂移区是以不同注入能量形成的不同深度的分层漂移区。本发明还公开了所述N型LDMOS器件的工艺方法,可以集成在BCD工艺中。
Description
技术领域
本发明涉及半导体领域,特别是指一种N型LDMOS器件,本发明还涉及所述N型LDMOS器件的工艺方法。
背景技术
DMOS由于具有耐高压,大电流驱动能力和极低功耗等特点,目前在电源管理电路中被广泛采用。在BCD工艺中,DMOS虽然与CMOS集成在同一块芯片中,但由于高耐压和低导通电阻的要求,DMOS在本底区和漂移区的条件与CMOS现有的工艺条件共享的前提下,其导通电阻与击穿电压存在矛盾,往往无法满足开关管应用的要求。在LDMOS器件中,导通电阻是一个重要的指标。因此,为了制作高性能的LDMOS,需要采用各种方法优化器件的导通电阻及击穿电压。
目前常规的N型LDMOS的结构如图1所示,图中包含P型衬底101,N型埋层102,N型深阱103,P阱107,栅氧化层10,8,多晶硅栅极109,重掺杂N型区(源区)111及重掺杂N型区(漏区)115。这种结构没有对器件的电场分布进行优化,表面的电场强度较高,击穿电压不够理想。
发明内容
本发明所要解决的技术问题是提供一种N型LDMOS器件,改善漂移区电势分布,提高器件的击穿电压。
为解决上述问题,本发明提供一种N型LDMOS器件,在P型衬底上具有N型埋层,埋层上为N型深阱;所述N型深阱中具有P阱,P阱中包含有重掺杂P型区以及所述LDMOS器件的源区,硅衬底表面具有栅氧化层及多晶硅栅极;所述N型深阱中还具有LDMOS器件的漏区,引线通过接触孔将重掺杂P型区、源区以及漏区引出;所述的P阱中的重掺杂P型区与源区之间以STI场氧隔离,LDMOS器件的漂移区中漏区两侧具有STI场氧,漂移区是以不同注入能量形成的不同深度的分层漂移区。
进一步地,所述的STI场氧,或者为LOCOS。
进一步地,所述漂移区是以分段分能量注入形成,两段漂移区距离STI场氧靠近沟道一侧的底部边缘或LOCOS沟道侧鸟嘴处的距离范围均为0.1~0.3μm;低能量注入范围为50~150keV,高能量注入范围300~600keV。
为解决上述问题,本发明所述的N型LDMOS器件的工艺方法,包含如下步骤:
第1步,在P型衬底上形成N型埋层;
第2步,在N型埋层之上淀积一层外延层;
第3步,光刻定义形成STI场氧;
第4步,光刻打开阱注入区域,注入形成P阱,并分别注入形成低能量漂移区及高能量漂移区;
第5步,热氧化生成栅氧化层,淀积多晶硅并刻蚀形成多晶硅栅极;制作侧墙;离子注入形成重掺杂P型区及所述LDMOS器件的源区及漏区;
第6步,完成接触孔工艺,制作电极。
进一步地,所述第1步采用的衬底为电阻率范围为0.007~0.013Ω·cm的P型低阻衬底。
进一步地,所述第4步,漂移区第一次注入能量为50~150keV,第二次注入能量为300~600keV。
本发明所述的N型LDMOS器件,采用STI场氧隔离,漂移区采用高低能量的不同注入形成分层的漂移区,避开最容易达到的击穿电场的STI边角区域,从而改善漂移区的电势分布,降低电场强度。本发明所述的N型LDMOS器件的工艺方法,可以继承在BCD工艺中,利用平台中原有的工艺条件,在不额外增加掩膜版并且利用原有注入条件的情况下,仅通过调整器件结构的光刻图形,使得器件保持较好特性的前提下,提高击穿电压。
附图说明
图1是传统N型LDMOS器件的结构示意图。
图2~图7是本发明工艺步骤示意图。
图8是本发明工艺步骤流程图。
附图标记说明
101是P型衬底,102是N型埋层,103是N型深阱,104是STI场氧,105、106是N型漂移区,107是P阱,108是栅氧化层,109是多晶硅栅极,110是侧墙,111是源区,112是重掺杂P型区,113是接触孔,114是电极(引线),115是漏区,a、b是距离。
具体实施方式
本发明所述的N型LDMOS器件,如图7所示,在P型衬底101上具有N型埋层102,埋层102上为N型深阱103;所述N型深阱103中具有P阱107,P阱107中包含有重掺杂P型区112以及所述LDMOS器件的源区111,硅衬底表面具有栅氧化层108及多晶硅栅极109;所述N型深阱103中还具有LDMOS器件的漏区115,引线114通过接触孔113将重掺杂P型区112、源区111以及漏区115引出;所述的P阱107中的重掺杂P型区112与源区111之间以STI场氧104隔离,LDMOS器件的漂移区中漏区115两侧具有STI场氧104,漂移区是以不同注入能量形成的不同深度的分层漂移区,如较低能量注入形成的漂移区105,以及较高能量注入形成的漂移区106。
所述的STI场氧,也可以替换采用LOCOS。如图7中所示,两段漂移区距离STI场氧靠近沟道一侧的底部边缘或LOCOS沟道侧鸟嘴处的距离a和b范围均为0.1~0.3μm。
本发明所述的N型LDMOS器件的工艺方法,包含如下步骤:
第1步,在电阻率范围为0.007~0.013Ω·cm的P型衬底上形成N型埋层,如图2所示。
第2步,在N型埋层之上淀积一层外延层,如图3所示。
第3步,如图4所示,利用有源区光刻,在N型深阱103打开浅槽区域,刻蚀场氧区;浅槽区填充氧化物;经刻蚀和研磨之后形成STI场氧104。或者采用LOCOS工艺形成隔离。
第4步,光刻打开阱注入区域,注入形成P阱107,并分别注入形成低能量注入的漂移区105及高能量注入的漂移区106。低能量漂移区105离子注入能量范围为50~150keV,高能量漂移区106离子注入能量范围300~600keV,如图5所示。
第5步,如图6所示,热氧化生成栅氧化层108,淀积多晶硅并刻蚀形成多晶硅栅极109;制作侧墙110;离子注入形成重掺杂P型区112及所述LDMOS器件的源区111及漏区115。
第6步,完成接触孔113工艺,制作电极114,最终器件完成如图7所示。
以上仅为本发明的优选实施例,并不用于限定本发明。对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (4)
1.一种N型LDMOS器件,在P型衬底上具有N型埋层,埋层上为N型深阱;所述N型深阱中具有P阱,P阱中包含有重掺杂P型区以及所述LDMOS器件的源区,硅衬底表面具有栅氧化层及多晶硅栅极;所述N型深阱中还具有LDMOS器件的漏区,引线通过接触孔将重掺杂P型区、源区以及漏区引出;其特征在于:
所述的P阱中的重掺杂P型区与源区之间以STI场氧或者LOCOS隔离,LDMOS器件的漂移区中漏区两侧具有STI场氧或者LOCOS隔离,漂移区是以不同注入能量形成的不同深度的分层漂移区;所述漂移区还是以分段分能量注入形成,两段漂移区距离STI场氧靠近沟道一侧的底部边缘或LOCOS沟道侧鸟嘴处的距离范围均为0.1~0.3µm;低能量注入范围为50~150keV,高能量注入范围300~600keV。
2.制造如权利要求1所述的N型LDMOS器件的工艺方法,其特征在于:包含如下步骤:
第1步,在P型衬底上形成N型埋层;
第2步,在N型埋层之上淀积一层外延层;
第3步,光刻定义形成STI场氧;
第4步,光刻打开阱注入区域,注入形成P阱,并分别注入形成低能量漂移区及高能量漂移区;
第5步,热氧化生成栅氧化层,淀积多晶硅并刻蚀形成多晶硅栅极;制作侧墙;离子注入形成重掺杂P型区及所述LDMOS器件的源区及漏区;
第6步,完成接触孔工艺,制作电极。
3.如权利要求2所述的N型LDMOS器件的工艺方法,其特征在于:所述第1步,所述衬底为电阻率范围为0.007~0.013Ω•cm的P型低阻衬底。
4.如权利要求2所述的N型LDMOS器件的工艺方法,其特征在于:所述第4步,漂移区第一次注入能量为50~150keV,第二次注入能量为300~600keV。
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