WO2010130602A1 - Hochvolt-feldeffekttransistor mit vergrabener driftstrecke und entsprechendes herstellungsverfahren - Google Patents
Hochvolt-feldeffekttransistor mit vergrabener driftstrecke und entsprechendes herstellungsverfahren Download PDFInfo
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- WO2010130602A1 WO2010130602A1 PCT/EP2010/056045 EP2010056045W WO2010130602A1 WO 2010130602 A1 WO2010130602 A1 WO 2010130602A1 EP 2010056045 W EP2010056045 W EP 2010056045W WO 2010130602 A1 WO2010130602 A1 WO 2010130602A1
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- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 230000005669 field effect Effects 0.000 title description 2
- 239000004065 semiconductor Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000002513 implantation Methods 0.000 claims description 107
- 239000000758 substrate Substances 0.000 claims description 24
- 238000002955 isolation Methods 0.000 claims description 18
- 239000002019 doping agent Substances 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000004913 activation Effects 0.000 claims description 5
- 210000000746 body region Anatomy 0.000 description 7
- 239000002800 charge carrier Substances 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 241000293849 Cordylanthus Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003031 high energy carrier Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
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- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7801—DMOS transistors, i.e. MISFETs with a channel accommodating body or base region adjoining a drain drift region
- H01L29/7816—Lateral DMOS transistors, i.e. LDMOS transistors
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- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823814—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the source or drain structures, e.g. specific source or drain implants or silicided source or drain structures or raised source or drain structures
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- H01L21/8238—Complementary field-effect transistors, e.g. CMOS
- H01L21/823892—Complementary field-effect transistors, e.g. CMOS with a particular manufacturing method of the wells or tubs, e.g. twin tubs, high energy well implants, buried implanted layers for lateral isolation [BILLI]
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Definitions
- the present invention relates to a structure of a vertical high-voltage transistor, in particular a high-voltage PMOS transistor, and an associated manufacturing method.
- a structure of a vertical high-voltage transistor in particular a high-voltage PMOS transistor, and an associated manufacturing method.
- high-voltage transistors is usually one of a
- Source and drain contact areas are also arranged at a distance from each other at the top of the device 5.
- the channel region is n-type in a PMOS transistor, and the source and drain contact regions are p-type doped.
- the gate electrode is electrically isolated from the semiconductor material by a gate dielectric.
- drift path 0 between the channel and the drain, in which the charge carriers are accelerated from the channel to the drain.
- An insulating region can be present on the top side of the component over the drift path, on which an electrically conductive field plate can be arranged to improve the electric field distribution and, for example, electrically conductively connected to the gate electrode.
- Such lateral high-voltage transistors have the disadvantage that hot, that is, high-energy carriers in the vicinity of the gate dielectric or a border area (bird's beak) of the upper-side isolation region occur, which affect the operation of the transistor. Since the drift path and the channel are arranged parallel to the top of the device, the transistor also claims a relatively large surface area of the device. In addition, the electrical resistance in the on state (on-resistance) is relatively high. The gate-drain capacitance is high because of the small distance between the field plate and the drain contact. Therefore, embodiments are also used in which the field plate is above the
- Drift path is omitted.
- the electric field at the beginning of the drift path changed and thus the resistance in the on state can be optimized.
- the object of the present invention is to specify an improved high-voltage transistor and an associated production method.
- the channel region is located on an upper side of a semiconductor substrate on the side of the source facing away from the drain.
- the gate electrode is therefore not arranged between the source and drain as usual, but also on the side of the source facing away from the drain.
- the drift path is located in a doped well of a first conductivity type, and in this well is arranged a well doped for the opposite second conductivity type, forming a body region and containing the channel region.
- a doped for the first conductivity type contact region is arranged, which is provided for source.
- the channel region begins, which is controlled by a gate electrode arranged on the top side, which is separated from the semiconductor material by a gate dielectric.
- the channel region terminates at the pn junction between the doped wells.
- the doped well of the second conductivity type can be widened by a further implantation of the same second conductivity type in the depth, so that the drift path has more vertically oriented portions and is thereby extended.
- the arrangement of gate, source and drain is axisymmetric or mirror-symmetrical to a plane perpendicular to the top of the device through the gate electrode extending symmetry axis or plane of symmetry.
- the doped well of the first conductivity type is enclosed by a doped well of the second conductivity type, which is referred to below as an isolation well to distinguish it from the other wells, and thereby separated from the rest of the substrate.
- the innermost well forming the body region and the channel region is doped n-doped
- the further doped well containing the drift path is p-doped
- the insulation well is n-doped
- the substrate can be doped n-type, for example - have basic conductive doping.
- the substrate can in this embodiment in particular by a Semiconductor body or a base substrate may be formed, on which a semiconductor layer is epitaxially grown. The growth of a semiconductor layer may be advantageous in order to simplify the process of manufacturing the insulation well.
- a contact region may also be provided on the upper side for the insulation trough, so that the insulation trough can be set to an intended electrical potential.
- the various contact areas may be separated from each other by isolation areas at the top of the substrate.
- a field plate electrically insulated from the semiconductor material can be arranged above the drift path.
- the doped well in which the contact region is embedded for source may be doped with a highly doped
- Implantations can be made to optimize the doped wells in different ways.
- implantations of dopant are carried out, with which a doped well of a second conductivity type opposite to a first conductivity type is formed within a further doped well of the first conductivity type on an upper side of a semiconductor component.
- a contact region of the first conductivity type provided for the source is produced in the doped well of the second conductivity type.
- a contact region of the first conductivity type provided for drain is produced by a stronger doping.
- a gate dielectric and then a gate electrode are arranged.
- an interface of the doped well of the second conductivity type to the semiconductor material of the first conductivity type is arranged so that from the interface there is a continuous connection within semiconductor material of the first conductivity type to the contact region provided for drain. There, the drift path of the high-voltage transistor is provided.
- an insulation well is produced by an implantation on an upper side of the substrate and then epitaxially grown on this top, a layer of semiconductor material, with which the implanted insulation well is buried.
- FIG. 1 shows an embodiment of a high-voltage transistor with a buried drift path in cross-section.
- FIG. 2 shows a high-voltage transistor which can be produced in the same substrate together with the high-voltage transistor according to the invention, in cross-section, using the production method according to the invention.
- FIG. 1 shows an embodiment of the high-voltage transistor in cross-section.
- the structure of at least the source, drain and gate center of the component is preferably axially symmetrical with respect to that in FIG. 1 drawn symmetry axis S; the central structure of the component is transferred in the case of an axis symmetry with a rotation of 180 ° about the axis of symmetry S in itself.
- a substrate 21 of semiconductor material which may be provided, for example, with a basic doping of a first conductivity type, there are a first implantation region 1 and a second implantation region 2 of a second conductivity type, which is opposite to the first conductivity type. These implantation regions 1, 2 are buried beneath the upper side of the substrate 21 in the semiconductor material.
- a connection between these implantation regions 1, 2 and the upper side of the substrate 21 can be formed by a third implantation region 3, so that the implantation regions 1, 2, 3 can be externally electrically connected.
- the implantation regions 1, 2, 3 include a fourth implantation region 4, which forms the doped well of the first conductivity type.
- a fifth implantation region 5 and a sixth implantation region 6 form the doped well of the second conductivity type for the body region and the channel region.
- first contact region 7 in the third implantation region 3 There are a first contact region 7 in the third implantation region 3, a second contact region 8 in the fourth implantation region 4, and a third contact region 9 and a fourth contact region 10 in the sixth implantation region 6.
- the first contact region 7 and the third contact region 9 are doped higher for the second conductivity type than the third implantation region 3 or the sixth implantation region 6.
- the first contact region 7 is provided as a connection for the third implantation region 3.
- the third contact region 9 is provided as a body connection for the sixth implantation region 6.
- the second contact area 8 and the fourth Contact regions 10 are doped higher for the first conductivity type than the fourth implantation region 4.
- the second contact region 8 is provided as a drain connection
- the fourth contact region 10 is provided as a source region.
- the insulating regions 11, 12, 13 may be formed by a field oxide or by shallow trench isolations be.
- a gate electrode 14 is arranged above a gate dielectric 15 on the upper side of the semiconductor component such that the center of symmetry of the transistor formed by the symmetry axis S passes through the gate electrode 14.
- the gate electrode 14 is located above a channel region 16 in the sixth implantation region 6 functioning as the body.
- the drift path 17 is located in the fourth implantation region 4 and extends from the end of the channel region 16 facing away from the source to the second contact region 8. which forms the drain connection.
- the drift path 17 is guided around the fifth implantation region 5 and the sixth implantation region 6. By the fifth and sixth implantation region 5, 6, the drift path 17 is displaced deep into the substrate and thereby extended.
- the electrical conditions in the drift path 17 can be improved in a further embodiment by an electrically conductive field plate 22 arranged on the third insulation region 13.
- the field plate 22 can in particular be connected in an electrically conductive manner to the drain connection.
- the implantation of the second implantation region 2 can take place, for example, with a mask having strip-shaped openings.
- the longitudinal direction of the strip-shaped openings is perpendicular to the plane of the cross section of FIG. 1.
- Typical dimensions of the areas of implantation are shown in FIG. 1 with a first width 18 of an implantation window under the drain and a second width 19 of an implantation window under the gate. Electrode marked.
- Such an implantation makes it possible to form the second implantation region 2 with curved upper and lower boundary surfaces, so that the fourth implantation region 4 is not exactly limited downwards.
- the drift path 17 present in the fourth implantation region 4 can be optimized in this way and, in particular according to the typical form of the interface between the second implantation region 2 and the fourth implantation region 4 illustrated in the cross section of FIG form for the charge carriers.
- the fifth implantation region 5 deepens the well of the body region formed by the sixth implantation region 6, so that the drift path 17 is displaced deeper into the substrate 21.
- the implantation steps can be carried out in the following manner.
- a first implantation region 1 which is provided as an insulation well, is produced by implantation of a dopant, for example antimony, as a buried layer.
- the first implantation region 1 is widened by a second implantation region 2, which can be done, for example, by implantation of phosphorus. With both implants, n-type wells are formed.
- flat troughs can first be implanted on the upper side of a semiconductor body or base substrate. These tubs are then buried by clicking on the
- a semiconductor layer is epitaxially grown, so that subsequently the first implantation region 1 and the second implantation region 2 are buried at a distance from the top of the epitaxial layer.
- a further implantation may optionally take place through mask openings, for example with the first width 18 and the second width 19 of the implantation window according to FIG. 1, whereby the dopant profile of the second implantation area 2, which is initially homogeneous in planar layers, with respect to FIG Optimization of the drift path 17 is modified.
- Implantation for the conductivity type of the first and second implantation region 1, 2 is introduced in an example, frame-shaped region, so that the third Implantation region 3 is formed. In a thermal process step then takes place a diffusion and activation of the implanted dopant.
- the fifth implantation region 5 is produced by means of an implantation through an implantation window, which typically has the width 20 shown in FIG.
- a thermal process step then takes place a diffusion and activation of the introduced dopant.
- the sixth implantation region 6 is produced, and in a further thermal process step, a diffusion and activation of the dopant introduced here takes place. Since, in the thermal process step following the implantation of the sixth implantation region 6, the fifth implantation region 5 has already been manufactured and has its own thermal budget, the total thermal budget of the fifth implantation region 5 is greater than the thermal budget, which is the sixth implantation region 6 is suspended. It follows that, as shown in FIG. 1, the dopant of the fifth implantation region 5 diffuses deeper into the substrate than the dopant of the sixth implantation region 6.
- the second implantation region 2 can be modified with further implantations for the same conductivity type, typically with the marked widths 18, 19 of the implantation windows, which are preferably in the form of stripes, perpendicular to the implantation region Drawing plane of Figure 1 extending openings of an implantation mask are formed.
- FIG. 2 shows a high-voltage transistor which is known per se and which can be integrated together with the high-voltage transistor according to the invention in the same substrate, with common implantation steps simplifying the production.
- an axis symmetry with respect to an axis of symmetry S ' is preferably present, which runs centrally through the drain.
- An insulation well is formed by the first implantation region 1, the second implantation region 2 and the third implantation region 3, as in the high-voltage transistor of FIG.
- the fourth implantation region 4 forms a well of the opposite first conductivity type.
- the drift path 37 is located in a drift-well 23 of the second conductivity type.
- the drift-well 23 can be produced together with the fifth implantation region 5 of the high-voltage transistor of FIG.
- the dopant which is introduced with the common implantation of the fifth implantation region 5 and the drift-well 23, receives the same thermal budget for both high-voltage transistors.
- the fifth implantation region 5 is preferably formed in the third implantation window of the width 20 while the drifting well 23 of the complementary high-voltage transistor is implanted as a planar-extended layer, the dopant of the fifth implantation region 5 diffuses more laterally, so that the fifth implantation region 5 after diffusion does not extend as deep into the substrate as the drift tray 23.
- the gate electrode 24 and the gate dielectric 25 are disposed over a channel region 26.
- a body region is provided, which in the illustrated example is formed by a deep body well 35 and a flat body well 36 of the first conductivity type.
- a first contact region 27 is provided for the isolation well, a second contact region 28 for drain, a third contact region 29 for the body region and a fourth contact region 30 for source.
- a field plate 38 may be arranged above the drift path 37 and is then preferably electrically conductively connected to the gate electrode 24.
- drift path 18 first width of an implantation window
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Insulated Gate Type Field-Effect Transistor (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE112010001982.7T DE112010001982B4 (de) | 2009-05-14 | 2010-05-04 | Hochvolt-Transistor mit vergrabener Driftstrecke und Herstellungsverfahren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102009021241A DE102009021241A1 (de) | 2009-05-14 | 2009-05-14 | Hochvolt-Transistor mit vergrabener Driftstrecke und Herstellungsverfahren |
DE102009021241.8 | 2009-05-14 |
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WO2010130602A1 true WO2010130602A1 (de) | 2010-11-18 |
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PCT/EP2010/056045 WO2010130602A1 (de) | 2009-05-14 | 2010-05-04 | Hochvolt-feldeffekttransistor mit vergrabener driftstrecke und entsprechendes herstellungsverfahren |
Country Status (2)
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DE (2) | DE102009021241A1 (de) |
WO (1) | WO2010130602A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11330453A (ja) * | 1998-05-18 | 1999-11-30 | Denso Corp | 横形絶縁ゲート型トランジスタ |
WO2007128383A1 (en) * | 2006-05-05 | 2007-11-15 | Austriamicrosystems Ag | High voltage transistor with improved high side performance |
US7355224B2 (en) * | 2006-06-16 | 2008-04-08 | Fairchild Semiconductor Corporation | High voltage LDMOS |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6489653B2 (en) * | 1999-12-27 | 2002-12-03 | Kabushiki Kaisha Toshiba | Lateral high-breakdown-voltage transistor |
SE0302594D0 (sv) * | 2003-09-30 | 2003-09-30 | Infineon Technologies Ag | Vertical DMOS transistor device, integrated circuit, and fabrication method thereof |
-
2009
- 2009-05-14 DE DE102009021241A patent/DE102009021241A1/de not_active Withdrawn
-
2010
- 2010-05-04 DE DE112010001982.7T patent/DE112010001982B4/de not_active Expired - Fee Related
- 2010-05-04 WO PCT/EP2010/056045 patent/WO2010130602A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11330453A (ja) * | 1998-05-18 | 1999-11-30 | Denso Corp | 横形絶縁ゲート型トランジスタ |
WO2007128383A1 (en) * | 2006-05-05 | 2007-11-15 | Austriamicrosystems Ag | High voltage transistor with improved high side performance |
US7355224B2 (en) * | 2006-06-16 | 2008-04-08 | Fairchild Semiconductor Corporation | High voltage LDMOS |
Also Published As
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DE112010001982B4 (de) | 2020-03-26 |
DE112010001982A5 (de) | 2012-12-13 |
DE102009021241A1 (de) | 2010-11-18 |
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