CN100346478C - 半导体装置 - Google Patents

半导体装置 Download PDF

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CN100346478C
CN100346478C CNB2004100334155A CN200410033415A CN100346478C CN 100346478 C CN100346478 C CN 100346478C CN B2004100334155 A CNB2004100334155 A CN B2004100334155A CN 200410033415 A CN200410033415 A CN 200410033415A CN 100346478 C CN100346478 C CN 100346478C
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五嶋一智
大古田敏幸
谷口敏光
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Sanyo Electric Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/77Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
    • H01L21/78Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
    • H01L21/82Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components
    • H01L21/822Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices to produce devices, e.g. integrated circuits, each consisting of a plurality of components the substrate being a semiconductor, using silicon technology
    • H01L21/8248Combination of bipolar and field-effect technology
    • H01L21/8249Bipolar and MOS technology
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    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/04Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
    • H01L27/06Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration
    • H01L27/0611Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region
    • H01L27/0617Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type
    • H01L27/0623Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type in combination with bipolar transistors
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    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
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    • H01L29/72Transistor-type devices, i.e. able to continuously respond to applied control signals
    • H01L29/73Bipolar junction transistors
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    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/70Bipolar devices
    • H01L29/72Transistor-type devices, i.e. able to continuously respond to applied control signals
    • H01L29/73Bipolar junction transistors
    • H01L29/735Lateral transistors

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Abstract

一种半导体装置,消减BiCMOS工艺的工序数量。在P型半导体衬底1的表面较深地形成第一N阱3A、第二N阱3B。在第一N阱3A中形成第一P阱4A,并在该第一P阱4A中形成N沟道型MOS晶体管10。第二N阱3B被用于纵型NPN双极晶体管30的集电极。在第二N阱3B中形成第二P阱4B。第二P阱4B和第一P阱4A被同时形成。该第二P阱4B被用于纵型NPN双极晶体管30的基极。在第二P阱4B的表面形成纵型NPN双极晶体管30的N+型发射极层31、P+型基极电极层32。

Description

半导体装置
技术领域
本发明涉及一种半导体装置,特别是涉及在同一半导体衬底上设有MOS晶体管和双极晶体管的半导体装置。
背景技术
近年来,集成化模拟电路和数字电路的模拟数字混合LSI正在被开发。在这种LSI中,模拟电路主要由双极晶体管构成,数字电路由MOS晶体管构成。当在同一半导体衬底上形成MOS晶体管和双极晶体管时,通常使用组合了双向工艺和CMOS工艺的BiCMOS工艺。
在现有的BiCMOS工艺中,由于相对CMOS工艺工序数量大幅地增加,因而招致LSI的制造成本及制造天数大幅地增加。对此,在专利文献1中记载了:通过形成使用所谓的三重阱CMOS工艺的双极晶体管谋求减少工序数的技术。
专利文献1:特开2000-3972号公报
发明内容
但是,双极晶体管的基极利用特别追加的工序形成,因此,工序数增加。
因此,本发明中,使用三重阱CMOS工艺,而不追加特别的工序,形成各种型号的双极晶体管。其主要的结构特征是,在P型半导体衬底的表面形成N阱,并在其中形成P沟道型晶体管。而在N阱中形成P阱,并在其中形成N沟道型晶体管。而后,将N阱作为纵型NPN双极晶体管的集电极使用。
并且,将P阱作为纵型NPN双极晶体管或横型NPN双极晶体管的基极使用。
附图说明
图1是本发明实施例的半导体装置的剖面图;
图2是本发明实施例的半导体装置的剖面图;
图3是本发明实施例的纵型NPN双极晶体管的特性图。
具体实施方式
下面参照附图详细说明本发明实施例的半导体装置。图1及图2是本发明实施例的半导体装置的剖面图。图1显示N沟道型MOS晶体管10、P沟道型MOS晶体管20、纵型NPN双极晶体管(Vertical NPN BJT)30,图2显示横型NPN双极晶体管(Lateral NPN BJT)40、横型PNP双极晶体管(Lateral PNP BJT)50、纵型PNP双极晶体管(Vertical PNP BJT)60。这两种类型的MOS晶体管及四种类型的双极晶体管都在同一半导体衬底1中形成。
其次,参照图1详细说明N沟道型MOS晶体管10、P沟道型MOS晶体管20、纵型NPN双极晶体管30的构造及其制造方法。
在P型半导体衬底1的表面形成用于将这些晶体管电分离的场绝缘膜2。在P型半导体衬底1的表面利用同一工序同时较深地形成第一N阱3A及第二N阱3B。其深度为例如自P型半导体衬底1表面起4um左右。在第一N阱3A中形成P阱4A,并在其中形成N沟道型MOS晶体管10。第一P阱4A比第一N阱3A浅,其深度为例如1um~2um。在第一P阱4A的表面形成N沟道型MOS晶体管10的N+的源极层11、N+型的漏极层12、栅极绝缘膜、栅极绝缘膜上的栅电极13及P阱4A的电位设定用P+层14。
另一方面,第二N阱3B被用于纵型NPN双极晶体管30的集电极。另外,在第二N阱3B中形成第二P阱4B。第二P阱4B和第一P阱4A同时由同一工序形成。该第二P阱4B被用于纵型NPN双极晶体管30的基极。在第二P阱4B的表面形成N+型发射极层31、P+型基极电极32。
另外,介由栅极绝缘膜在发射极层21和基极电极层32之间形成栅电极33。栅电极33和发射极层31连接。在第二N阱3B的表面形成N+型集电极层34。由于发射极层31和基极电极层32利用将栅电极33作为掩膜的离子注入形成,故基极电极层32和发射极层31的距离由栅电极33的长度决定。
在第一N阱3A中形成第4N阱5A。而后,在其中形成P沟道型MOS晶体管20。第4N阱5A比第一N阱3A浅,其深度为例如1um~2um。在第4N阱5A的表面形成P沟道型MOS晶体管20的P+的源极层21、P+型漏极层22、栅极绝缘膜、栅极绝缘膜上的栅电极23及第4N阱5A的电位设定用N+层24。
其次,参照图2详细说明横型NPN双极晶体管40、横型PNP双极晶体管50、纵型PNP双极晶体管60的构造及其制造方法。
在P型半导体衬底1的表面形成用于将这些晶体管电分离的场绝缘膜2。首先,说明横型NPN双极晶体管40。在P型半导体衬底1的表面形成第三N阱3C。该第三N阱3C和所述的第一N阱3A及第二N阱3B同时由同一工序形成。在第三N阱3C中形成第三P阱4C。该第三P阱4C也和所述的第一P阱4A及第二P阱4B同时由同一工序形成。在第三N阱3C中形成横型NPN双极晶体管40。第三P阱4C被用于横型NPN双极晶体管40的基极。在第三P阱4C的表面形成N+型发射极层41、N+型集电极层42。
另外,介由栅极绝缘膜在发射极层41和集电极层42之间形成栅电极43。栅电极43和发射极层41连接。然后,在第三P阱4C的表面形成P+型基极层44。由于发射极层41和基极层42利用将栅电极43作为掩膜的离子注入形成,故发射极层41和集电极层42的距离,也就是基极宽度由栅电极43的长度决定。另外,在第三N阱3C的表面形成第三N阱3C的电位设定用N+层45。
其次,说明横型PNP双极晶体管50。第五N阱5B和第四N阱5A同时由同一工序形成,并作为该晶体管的基极使用。
在第五N阱5B的表面形成P+型发射极层51、P+型集电极层52。介由栅极绝缘膜在发射极层51和集电极层52之间形成栅电极53。栅电极53和发射极层51连接。然后,在第五N阱5B的表面形成N+型基极层54。由于发射极层51和集电极层52利用将栅电极53作为掩膜的离子注入形成,故发射极层51和集电极层52的距离,也就是基极宽度由栅电极53的长度决定。另外,在和第五N阱5B邻接的P型半导体衬底1表面形成衬底电极设定用P+层55。
其次,说明纵型PNP双极晶体管60。第六N阱5C和第四N阱5A及第五N阱5B同时由同一工序形成,并作为该晶体管的基极使用。
在第六N阱5C的表面形成P+型发射极层61、N+型基极电极层62。介由栅极绝缘膜在发射极层61和基极电极层62之间形成栅电极63。栅电极63和发射极层61连接。由于发射极层61和基极电极层62利用将栅电极63作为掩膜的离子注入形成,故发射极层61和基极电极层62的距离由栅电极63的长度决定。另外,在和第六N阱5C邻接的P型半导体衬底1的表面形成P+型集电极层64。
其次,说明本发明实施例的半导体装置的制造方法。首先,在例如P型硅衬底等半导体衬底1表面形成第一N阱3A、第二N阱3B、第三N阱3C。该工序利用例如磷的离子注入和其后的热扩散进行。
其次,使用LOCOS法(Local Oxidation Of Silicon)形成场绝缘膜2。然后,形成第一P阱4A、第二P阱4B、第三P阱4C、第四N阱5A、第五N阱5B、第六N阱5C。P阱群4A、4B、4C和N阱群5A、5B、5C由各自的离子注入工序形成并进行热扩散。可以同时进行热扩散,也可以在各自的离子注入工序后分别进行。
而后,利用热氧化形成栅极绝缘膜,根据需要,进行N沟道型MOS晶体管10及P沟道型MOS晶体管20的沟道离子注入。然后,在栅极绝缘膜上形成栅电极12、23、33、43、53、63。这些栅电极利用多晶硅层或多侧面层形成。
之后,利用磷或砷这样的N型杂质的离子注入进行N+层的形成。N+层包括:所述的N沟道型MOS晶体管10的源极层11、漏极层、P沟道型MOS晶体管20的N+层24、纵型NPN双极晶体管30的发射极层31、集电极层34、横型NPN双极晶体管40的发射极层41、集电极层42、N+层45、横型PNP双极晶体管50的基极层54、纵型PNP双极晶体管60的基极电极层62。
另外,利用硼或二氟化硼这样的P型杂质的离子注入进行P+层的形成。P+层包括:所述的N沟道型MOS晶体管10的P+层14、P沟道型MOS晶体管20的源极层21、漏极层22、纵型NPN双极晶体管30的基极电极层32、横型NPN双极晶体管40的基极层44、横型PNP双极晶体管50的发射极层51、集电极层52、纵型PNP双极晶体管60的发射极层61、发射极层64。
通过本实施例,使用CMOS三重阱工艺,不需要特别的追加工序,而可在CMOS的基础上,在同一半导体衬底1上形成四种类型的双极晶体管,即:纵型NPN双极晶体管30、横型NPN双极晶体管40、横型PNP双极晶体管50、纵型PNP双极晶体管60。
图3是显示所述的纵型NPN双极晶体管30的特性的图,横轴表示集电极电流,纵轴表示电流放大系数hFE。由该特性图可知,可得到电流放大系数hFE为100,截止频率为1GHz这样的不逊色于双向工艺的优良的特性。
根据本实施例,通过将三重阱CMOS工艺的各种阱用于双极晶体管的基极或集电极,可大幅地消减BiCMOS工艺的工序数量。

Claims (4)

1、一种半导体装置,其特征在于,其包括:P型半导体衬底;第一N阱,其被形成在所述半导体衬底表面,并在其中形成P沟道型晶体管;第一P阱,其被形成在所述第一N阱中,并在其中形成N沟道型晶体管;第二N阱,其在所述半导体衬底上和所述第一N阱分离形成,所述第二N阱被作为纵型NPN双极晶体管的集电极使用,所述第一N阱和所述第二N阱同时由同一工序形成;
在所述第二N阱中形成的第二P阱,该第二P阱和所述第一P阱同时由同一工序形成,该第二P阱作为所述纵型NPN双极晶体管的基极使用。
2、如权利要求1所述的半导体装置,其特征在于,在所述半导体衬底表面具有:第三N阱,其和所述第一及第二N阱同时由同一工序形成;在该第三N阱中形成的第三P阱,该第三P阱和所述第一P阱同时由同一工序形成,将所述第三P阱作为横型NPN双极晶体管的基极使用。
3、如权利要求1所述的半导体装置,其特征在于,在所述第一N阱中形成比该第一N阱浅的第四N阱,并在该第四N阱中形成所述P沟道型晶体管,在所述半导体衬底上还具有和所述第四N阱同时由同一工序形成的第五N阱,所述第五N阱作为横型PNP双极晶体管的基极使用。
4、如权利要求1所述的半导体装置,其特征在于,在所述第一N阱中形成比该第一N阱浅的第四N阱,并在该第四N阱中形成所述P沟道型晶体管,在所述半导体衬底上还具有和所述第四N阱同时由同一工序形成的第六N阱,所述第六N阱作为纵型PNP双极晶体管的基极使用。
CNB2004100334155A 2003-04-07 2004-04-07 半导体装置 Expired - Lifetime CN100346478C (zh)

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