CN108550529B - 一种高压vdmos器件的制造方法 - Google Patents

一种高压vdmos器件的制造方法 Download PDF

Info

Publication number
CN108550529B
CN108550529B CN201810397906.XA CN201810397906A CN108550529B CN 108550529 B CN108550529 B CN 108550529B CN 201810397906 A CN201810397906 A CN 201810397906A CN 108550529 B CN108550529 B CN 108550529B
Authority
CN
China
Prior art keywords
wafer
layer
sio
thickness
front surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810397906.XA
Other languages
English (en)
Other versions
CN108550529A (zh
Inventor
赵秋森
陈晓伦
许柏松
徐永斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Xinshun Microelectronics Co ltd
Original Assignee
Jiangsu Xinshun Microelectronics Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Xinshun Microelectronics Co ltd filed Critical Jiangsu Xinshun Microelectronics Co ltd
Priority to CN201810397906.XA priority Critical patent/CN108550529B/zh
Publication of CN108550529A publication Critical patent/CN108550529A/zh
Application granted granted Critical
Publication of CN108550529B publication Critical patent/CN108550529B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • 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
    • H01L29/66007Multistep manufacturing processes
    • H01L29/66075Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66227Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
    • H01L29/66409Unipolar field-effect transistors
    • H01L29/66477Unipolar field-effect transistors with an insulated gate, i.e. MISFET
    • H01L29/66674DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
    • H01L29/66712Vertical DMOS transistors, i.e. VDMOS transistors
    • 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
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02107Forming insulating materials on a substrate
    • H01L21/02109Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
    • H01L21/02112Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
    • H01L21/02123Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
    • H01L21/02164Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
    • 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
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/02104Forming layers
    • H01L21/02107Forming insulating materials on a substrate
    • H01L21/02109Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
    • H01L21/02112Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
    • H01L21/02123Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
    • H01L21/0217Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
    • 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
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/26Bombardment with radiation
    • H01L21/263Bombardment with radiation with high-energy radiation
    • H01L21/265Bombardment with radiation with high-energy radiation producing ion implantation
    • H01L21/26586Bombardment with radiation with high-energy radiation producing ion implantation characterised by the angle between the ion beam and the crystal planes or the main crystal surface

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)

Abstract

本发明涉及一种高压VDMOS器件的制造方法,其特征在于所述方法通过在正面工艺前进行背面注入,对背面进行掺杂,并生长Si3N4对圆片背面进行保护,然后进行圆片正面工艺,从而提高背面掺杂浓度,降低接触电阻,得到更低的器件二极管正向压降和导通电阻。

Description

一种高压VDMOS器件的制造方法
技术领域
本发明涉及一种高压VDMOS器件的制造方法。属于集成电路或分立器件制造技术领域。
背景技术
在使用掺锑衬底的高压VDMOS器件制造工艺过程中,背面接触电阻一直是影响器件二极管正向压降和导通电阻的重要影响因素。由于掺锑衬底掺杂浓度不够高,一般衬底电阻率在0.008-0.02ohm.cm即掺杂浓度在6.33e18/cm3-1.22e18/cm3,如衬底直接和背面金属接触,不能形成很好的欧姆接触,常规工艺是在正面工艺完成后,进行减薄,然后进行背面注入,进行退火,再生长背面金属的方法来增加衬底背面浓度,降低器件背面接触电阻,以达到低的器件二极管正向压降和导通电阻。但这样的背面注入工艺是在正面工艺完成之后才作业,由于正面金属已经形成,因此背面注入后的退火无法使用超过合金温度的工艺温度条件,一般背面注入退火温度在400℃到450℃之间,这样的退火温度杂质激活率很低,对大剂量背面注入引入的缺陷修复也不充分,导致器件二极管正向压降偏高,二极管损耗偏大。
发明内容
本发明所要解决的技术问题是针对上述现有技术提供一种高压VDMOS器件的制造方法,克服常规掺锑衬底高压VDMOS背面工艺的缺点,降低器件二极管正向压降和工作损耗。
本发明解决上述问题所采用的技术方案为:一种高压VDMOS器件的制造方法,所述方法通过在正面工艺前进行背面注入,对背面进行掺杂,并生长Si3N4对圆片背面进行保护,然后进行圆片正面工艺,从而提高背面掺杂浓度,降低接触电阻,得到更低的器件二极管正向压降和导通电阻。
优选地,所述方法主要包括以下步骤:
第一步、选择合适厚度的外延圆片;
第二步、对圆片背面进行元素注入,注入元素可以是硼,也可以是磷,量在30Kev到160Kev之间,剂量在1E14到1E16之间。
第三步、在圆片正面和背面生长一层SiO2层作为一个缓冲应力层;
第四步、在圆片正面和背面的SiO2层表面上生长Si3N4层对圆片背面进行保护;
第五步、去除圆片正面的Si3N4层,正面停留在SiO2层;
第六步、去除圆片正面的SiO2层,圆片背面生长的SiO2和Si3N4完全保留;
第七步、完成圆片的正面工艺;
第八步、去除圆片背面的Si3N4层和SiO2层;
第九步、在圆片背面生长背面金属。
优选地,对于常规厚度的外延圆片,减薄厚度厚于最终硅片厚度;或直接采购接近最终厚度的外延圆片。
优选地,背面注入元素为硼或磷,注入能量在30Kev到160Kev之间,剂量在1E14到1E16之间。
优选地,使用LPTEOS工艺形成SiO2层,厚度在
Figure BDA0001645001180000021
Figure BDA0001645001180000022
之间。
优选地,使用LPSiN工艺形成Si3N4层,厚度在
Figure BDA0001645001180000023
Figure BDA0001645001180000024
之间。
优选地,使用干法刻蚀工艺去除圆片正面的Si3N4层。
优选地,使用湿法腐蚀工艺去除圆片正面的SiO2层。
与现有技术相比,本发明的优点在于:
1、在正面工艺前进行背面元素注入,并利用正面工艺中的热过程进行背面元素的扩散,背面元素扩散深度深,注入引入的晶格缺陷修复效果更好,降低了器件背面的接触电阻,降低器件二极管正向压降和导通电阻。
2、圆片背面增加了LPSiN(Si3N4),降低了高温炉管工艺过程中圆片背面外扩散造成的圆片表面浓度增加的影响,提高了器件圆片良率。
附图说明
图1为本发明高压VDMOS的工艺流程。
图2为本发明常规掺锑衬底高压VDMOS的工艺流程。
图3-图12为本发明流程的具体过程说明。
具体实施方式
下面结合具体的实例来进一步说明实现本发明提出的一种无铝下CVD肖特基二极管芯片及制造工艺。并且需要说明的是,附图均采用非常简化的形式且均使用非精确的比例,仅用以方便、明晰地辅助说明本发明的结构及实现的方式。
参见图3,本发明涉及一种高压VDMOS器件的制造方法,主要是通过在正面工艺前进行背面注入,对背面进行掺杂,并生长LPSiN(Si3N4)对圆片背面进行保护,然后进行圆片正面工艺,从而提高背面掺杂浓度,降低接触电阻,得到更低的器件二极管正向压降和导通电阻。具体包含以下几个步骤:
如图4所示,第1步,对于常规厚度的外延圆片,使用背面减薄工艺进行硅片减薄,减薄厚度稍厚于最终硅片厚度;也可以直接采购接近最终厚度的外延圆片,这样就可以减少减薄的工艺时间或者直接省略减薄步骤,更能够降低成本。
如图5所示,第2步,使用离子注入机,对圆片背面进行注入,注入元素可以是硼,也可以是磷,增加衬底溶度,减小接触电阻,注入能量在30Kev到160Kev之间,剂量在1E14到1E16之间。
如图6所示,第3步,使用LPTEOS工艺,在圆片正面和背面生长一层SiO2层,厚度在
Figure BDA0001645001180000031
Figure BDA0001645001180000032
之间,SiO2层作为一个缓冲应力层,由于后续生长的Si3N4膜应力较大,会对圆片本身造成影响,损坏圆片表面,因此先用一层SiO2进行缓冲保护。
如图7所示,第4步,使用LPSiN工艺,在圆片正面和背面的SiO2层表面上生长Si3N4层,厚度在
Figure BDA0001645001180000033
Figure BDA0001645001180000034
之间,Si3N4可以降低后续高温炉管工艺过程中圆片背面外扩散造成的圆片表面浓度增加的影响,提高了器件圆片良率。
如图8所示,第5步,使用干法刻蚀工艺去除圆片正面的Si3N4层,正面停留在SiO2层。
如图9所示,第6步,使用湿法腐蚀工艺去除圆片正面的SiO2层,完成此工艺后,圆片背面生长的SiO2和Si3N4完全保留,而圆片正面的生长的SiO2和Si3N4完全去除;
如图10所示,第7步,完成圆片的正面工艺,按圆片原来的正常工艺流程完成整个正面工艺,一直做到正面金属或钝化层(如有);
如图11所示,第8步,使用干法刻蚀工艺去除圆片背面的LPSiN(Si3N4)和LPTEOS(SiO2);
如图12所示,第9步,在圆片背面生长背面金属。
除上述实施例外,本发明还包括有其他实施方式,凡采用等同变换或者等效替换方式形成的技术方案,均应落入本发明权利要求的保护范围之内。

Claims (6)

1.一种高压VDMOS器件的制造方法,其特征在于所述方法通过在正面工艺前进行背面注入,对背面进行掺杂,并生长Si3N4对圆片背面进行保护,然后进行圆片正面工艺,从而提高背面掺杂浓度,降低接触电阻,得到更低的器件二极管正向压降和导通电阻;所述方法主要包括以下步骤:
第一步、选择合适厚度的外延圆片;
第二步、对圆片背面进行元素注入,注入元素可以是硼,也可以是磷,量在30Kev到160Kev之间,剂量在1E14到1E16之间;
第三步、在圆片正面和背面生长一层SiO2层作为一个缓冲应力层;
第四步、在圆片正面和背面的SiO2层表面上生长Si3N4层对圆片背面进行保护;
第五步、去除圆片正面的Si3N4层,正面停留在SiO2层;
第六步、去除圆片正面的SiO2层,圆片背面生长的SiO2和Si3N4完全保留;
第七步、完成圆片的正面工艺,并利用正面工艺中的热过程进行背面元素的扩散;
第八步、去除圆片背面的Si3N4层和SiO2层;
第九步、在圆片背面生长背面金属。
2.根据权利要求1所述的一种高压VDMOS器件的制造方法,其特征在于对于常规厚度的外延圆片,减薄厚度厚于最终硅片厚度;或直接采购接近最终厚度的外延圆片。
3.根据权利要求1所述的一种高压VDMOS器件的制造方法,其特征在于使用LPTEOS工艺形成SiO2层,厚度在400Å到1000Å之间。
4.根据权利要求1所述的一种高压VDMOS器件的制造方法,其特征在于使用LPSiN工艺形成Si3N4层,厚度在1000Å到2000Å之间。
5.根据权利要求1所述的一种高压VDMOS器件的制造方法,其特征在于使用干法刻蚀工艺去除圆片正面的Si3N4层。
6.根据权利要求1所述的一种高压VDMOS器件的制造方法,其特征在于使用湿法腐蚀工艺去除圆片正面的SiO2层。
CN201810397906.XA 2018-04-28 2018-04-28 一种高压vdmos器件的制造方法 Active CN108550529B (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810397906.XA CN108550529B (zh) 2018-04-28 2018-04-28 一种高压vdmos器件的制造方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810397906.XA CN108550529B (zh) 2018-04-28 2018-04-28 一种高压vdmos器件的制造方法

Publications (2)

Publication Number Publication Date
CN108550529A CN108550529A (zh) 2018-09-18
CN108550529B true CN108550529B (zh) 2021-10-15

Family

ID=63513003

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810397906.XA Active CN108550529B (zh) 2018-04-28 2018-04-28 一种高压vdmos器件的制造方法

Country Status (1)

Country Link
CN (1) CN108550529B (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109659236B (zh) * 2018-12-17 2022-08-09 吉林华微电子股份有限公司 降低vdmos恢复时间的工艺方法及其vdmos半导体器件

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104681438A (zh) * 2013-11-27 2015-06-03 上海华虹宏力半导体制造有限公司 一种半导体器件的形成方法
CN104810363A (zh) * 2014-01-26 2015-07-29 北大方正集团有限公司 功率集成器件及其制作方法
CN106384710A (zh) * 2016-09-30 2017-02-08 上海华虹宏力半导体制造有限公司 防止衬底杂质外扩散的方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004012818B3 (de) * 2004-03-16 2005-10-27 Infineon Technologies Ag Verfahren zum Herstellen eines Leistungshalbleiterbauelements
JP5525940B2 (ja) * 2009-07-21 2014-06-18 ローム株式会社 半導体装置および半導体装置の製造方法
CN104425255A (zh) * 2013-08-30 2015-03-18 无锡华润上华半导体有限公司 非穿通型绝缘栅双极晶体管的制造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104681438A (zh) * 2013-11-27 2015-06-03 上海华虹宏力半导体制造有限公司 一种半导体器件的形成方法
CN104810363A (zh) * 2014-01-26 2015-07-29 北大方正集团有限公司 功率集成器件及其制作方法
CN106384710A (zh) * 2016-09-30 2017-02-08 上海华虹宏力半导体制造有限公司 防止衬底杂质外扩散的方法

Also Published As

Publication number Publication date
CN108550529A (zh) 2018-09-18

Similar Documents

Publication Publication Date Title
CN101176194B (zh) 半导体器件及其制造方法
WO2016051970A1 (ja) 半導体装置および半導体装置の製造方法
EP1365447A2 (en) Manufacturing method of semiconductor substrate
CN108550529B (zh) 一种高压vdmos器件的制造方法
CN104303280A (zh) 半导体基板的评价方法、评价用半导体基板、半导体装置
CN105810583B (zh) 横向绝缘栅双极型晶体管的制造方法
EP0211174B1 (en) Monolithic temperature compensated voltage-reference diode and method for its manufacture
JP2010283296A (ja) シリコンウェーハ及びその製造方法、並びに、半導体デバイスの製造方法
CN103137473B (zh) 以具有外延层的衬底制造场终止型igbt器件的方法
CN108231886B (zh) 制造半导体器件的方法以及半导体器件
EP4002430A1 (en) Bonded wafer and method of producing bonded wafer
US9431270B2 (en) Method for producing semiconductor device
CN108010840B (zh) 掺杂半导体器件的制备方法和半导体器件
JP6819174B2 (ja) ダイオードの製造方法
CN104241121A (zh) 制造二极管的方法
CN106257646B (zh) 嵌入pip电容的cmos制作方法
TW200410318A (en) Method of removing native oxide layer on doped region and fabrication of heterojunction bipolar transistor (HBT) and bipolar complementary metal-oxide-semiconductor transistor (BiCMOS) using the method
CN103400752A (zh) 离子注入工艺在ccd制作中的应用及ccd制作工艺
CN216450651U (zh) 低制造成本的横向超结mosfet结构
CN104425246A (zh) 绝缘栅双极型晶体管及其制备方法
CN106935498B (zh) 绝缘栅双极晶体管的背面场栏的低温氧化层制作方法
CN102437117B (zh) 一种新的硅化物和金属前介质集成工艺及该形成的结构
CN116646250A (zh) 一种碳化硅场效应管的制备方法
US20080128821A1 (en) Semiconductor Device Manufactured Using Passivation of Crystal Domain Interfaces in Hybrid Orientation Technology
CN111816552A (zh) 一种改善可控硅kg特性的方法

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: No. 78, Changshan Avenue, Jiangyin City, Wuxi City, Jiangsu Province, 214400

Applicant after: Jiangsu Xinshun Microelectronics Co.,Ltd.

Address before: No. 78, Changshan Avenue, Jiangyin City, Wuxi City, Jiangsu Province, 214400

Applicant before: XINSUN Co.,Ltd.

CB02 Change of applicant information
GR01 Patent grant
GR01 Patent grant