EP1048074A1 - Leistungs-mosfet - Google Patents

Leistungs-mosfet

Info

Publication number
EP1048074A1
EP1048074A1 EP98966510A EP98966510A EP1048074A1 EP 1048074 A1 EP1048074 A1 EP 1048074A1 EP 98966510 A EP98966510 A EP 98966510A EP 98966510 A EP98966510 A EP 98966510A EP 1048074 A1 EP1048074 A1 EP 1048074A1
Authority
EP
European Patent Office
Prior art keywords
power mosfet
mosfet according
conductivity type
zone
layer
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.)
Withdrawn
Application number
EP98966510A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jenö Tihanyi
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.)
Infineon Technologies AG
Original Assignee
Infineon Technologies AG
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 Infineon Technologies AG filed Critical Infineon Technologies AG
Publication of EP1048074A1 publication Critical patent/EP1048074A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types 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
    • H01L29/76—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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/40—Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
    • H01L29/41725—Source or drain electrodes for field effect devices
    • H01L29/4175—Source or drain electrodes for field effect devices for lateral devices where the connection to the source or drain region is done through at least one part of the semiconductor substrate thickness, e.g. with connecting sink or with via-hole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types 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
    • H01L29/76—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
    • H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
    • H01L29/7834—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with a non-planar structure, e.g. the gate or the source or the drain being non-planar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68—Types 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
    • H01L29/76—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
    • H01L29/7833—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's
    • H01L29/7835—Field effect transistors with field effect produced by an insulated gate with lightly doped drain or source extension, e.g. LDD MOSFET's; DDD MOSFET's with asymmetrical source and drain regions, e.g. lateral high-voltage MISFETs with drain offset region, extended drain MISFETs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/06—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
    • H01L29/0684—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions characterised by the shape, relative sizes or dispositions of the semiconductor regions or junctions between the regions
    • H01L29/0692—Surface layout
    • H01L29/0696—Surface layout of cellular field-effect devices, e.g. multicellular DMOS transistors or IGBTs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/40—Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/40—Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
    • H01L29/41725—Source or drain electrodes for field effect devices
    • H01L29/41766—Source or drain electrodes for field effect devices with at least part of the source or drain electrode having contact below the semiconductor surface, e.g. the source or drain electrode formed at least partially in a groove or with inclusions of conductor inside the semiconductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00—Semiconductor 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
    • H01L29/40—Electrodes ; Multistep manufacturing processes therefor
    • H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
    • H01L29/423—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
    • H01L29/42312—Gate electrodes for field effect devices
    • H01L29/42316—Gate electrodes for field effect devices for field-effect transistors
    • H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
    • H01L29/42356—Disposition, e.g. buried gate electrode
    • H01L29/4236—Disposition, e.g. buried gate electrode within a trench, e.g. trench gate electrode, groove gate electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a power MOSFET with a semiconductor layer of the other conductivity type arranged on a highly doped semiconductor substrate of one conductivity type, in which a highly doped source zone of the other conductivity type and a highly doped drain zone of the other conductivity type are formed, and with one over a semiconductor zone of the a gate type provided conductivity type.
  • This object is achieved according to the invention in a power MOSFET of the type mentioned at the outset by a highly conductive connection between the source zone and the semiconductor substrate.
  • This highly conductive connection can in particular be a metallic conductive connection.
  • a metallically conductive connection is created between the source zone provided on one surface side of the power MOSFET to the opposite surface of the semiconductor substrate, so that the semiconductor substrate and with it the source zone, for example, by means of a cooling vane on a support, such as a car body , can be screwed on, the semiconductor substrate and thus the source zone being at 0 volts.
  • the source zone is guided “downwards" with the semiconductor substrate, which is why it is referred to as a "source-down" FET.
  • the actual MOSFET in the semiconductor layer can be of conventional construction, in which the gate electrode is embedded in an insulator layer provided on the semiconductor layer.
  • the gate electrode in a trench in the semiconductor layer, for example such a trench being lined at its edge with an insulating layer made of silicon dioxide or silicon nitride and filled inside with doped polycrystalline silicon.
  • the conductive connection between the source zone and the semiconductor substrate can be formed from a highly doped semiconductor zone of the one conductivity type.
  • a trench for this conductive connection from which dopant of one conductivity type is then diffused and which is filled with polycrystalline or monocrystalline silicon.
  • Another possibility for designing the conductive connection consists of a trench which is at least partially filled with metal or a highly conductive layer. Titanium nitride can preferably be used for such a layer. Otherwise, the interior of the trench can be covered with polycrystalline silicon. be filled, which is doped with dopant of the other conductivity type.
  • the semiconductor substrate itself can be provided directly with a cooling device, such as a cooling lug, which can be screwed onto a base. A particularly effective heat dissipation is thus achieved.
  • the semiconductor layer between the drain zone and the gate electrode is preferably less doped than in the drain zone. This enables the MOSFET to operate at higher voltages. Such an operation is also favored if the distance between the drain zone and the edge of the gate electrode is at least 0.1 ⁇ m to about 5 ⁇ m.
  • the thickness of the insulator layer should preferably increase too steadily or in steps in the direction of the drain zone.
  • the contact between the highly doped source zone and the conductive connection can take place by means of a buried metal, such as, for example, a suicide or another conductive layer made of, for example, titanium nitride.
  • a buried metal such as, for example, a suicide or another conductive layer made of, for example, titanium nitride.
  • the silicon dioxide insulator layer is deposited over the short circuit between the heavily doped source zone and the conductive connection. It is also possible to interrupt the metallization there for the drain zone, for example an aluminum layer.
  • the gate electrodes can be arranged in a grid-like manner and a “network” is formed from polycrystalline silicon of the other conductivity type, which is embedded in the insulator layer made of silicon dioxide or another material, such as silicon nitride.
  • the highly doped drain zones of the other conductivity type are preferably contacted with an all-over metal layer made of, for example, aluminum, which can be designed in a lattice shape if the individual source zones have an aluminum short circuit extending to their surface.
  • a distance of a few tenths to 5 .mu.m should exist in the insulator layer between the highly doped drain zone of the other conductivity type and the edge of the gate electrode made of polycrystalline silicon in order to achieve a high dielectric strength. This is also promoted if the thickness of the insulating layer in the region of the gate electrode increases too gradually or continuously in the direction of the drain zone.
  • the drain zone can also be located higher or lower than the source zone with respect to the semiconductor surface.
  • a highly doped zone of the one conductivity type is used for the conductive connection, then this zone can be produced in a manner similar to that used for insulation diffusion or for integrated circuits insulated with a pn junction.
  • the conductive connection can also be made via a trench, from which dopant of one conductivity type has diffused out, and which is then filled with polycrystalline or single-crystal silicon or with an insulator, such as silicon dioxide.
  • the arrangement of the drain connections and the source zones can be strip-shaped or cell-like.
  • this is implanted in a trench which surrounds the drain zone.
  • the source zone which is connected to the conductive connection, which preferably consists of a deep Trench with a conductive wall consists of titanium nitride, for example, to which the semiconductor substrate is electrically connected.
  • the conductive connections can be arranged in any way; they can be provided, for example, in the form of cells between strip-shaped drain zones or even in strip form.
  • FIG. 1 is a sectional view through a first embodiment of the MOSFET according to the invention
  • FIG. 2 shows a sectional view through a second exemplary embodiment of the MOSFET according to the invention
  • FIG. 3 shows a plan view to illustrate the position of source zones and drain zones in a cell arrangement with a plurality of power MOSFETs
  • Fig. 4 is a sectional view through a third embodiment of the present invention.
  • FIG. 1 shows a sectional view of a silicon semiconductor substrate 1 which is p ++ -conducting, that is to say has a high boron doping, for example.
  • An n-type semiconductor layer 2 is epitaxially applied to this semiconductor substrate 1, in which n + -conductive drain zones 3 and n + -conductive source zones 4 are provided.
  • a p-conducting channel zone 5 is located between the source zones 4 and the drain zones 3.
  • Zones 3, 4 and 5 can each have an annular shape.
  • An insulator layer 6 made of silicon dioxide is provided on the surface of the semiconductor layer 2, in which gate electrodes 7 made of polycrystalline silicon are embedded.
  • the drain zones 3 are contacted with a metallization 8 made of aluminum.
  • this zone 9 with the source zone 4 via a metal
  • An electrode 11 made of, for example, aluminum is applied to the semiconductor substrate 1 on the “underside”, and is connected to a cooling vane 12 made of a relatively thick metal layer, with which the MOSFET can be screwed onto, for example, a car body.
  • the metal 10 causes a short circuit between the source zone 4 and the p + -conducting zone 9.
  • a silicide or, for example, titanium nitride can be used for this metal 10.
  • the insulator layer 6 is deposited over this short-circuit point. Another possibility is to interrupt the metallization 8 via the short-circuit point.
  • the metal 10 extends to the outer surface of the semiconductor layer 2.
  • the gate electrodes 7 are arranged in a grid-like manner and preferably consist of n + -conducting polycrystalline silicon which is embedded in the insulator layer 6 made of silicon dioxide or another suitable insulating material.
  • the n + -conducting drain zones 3 are contacted with the metal metallization 8 made of aluminum.
  • the distance between the zones 3 and the edge of the gate electrode 7 should range from a few 0.1 ⁇ m to about 5 ⁇ m in order to achieve a high dielectric strength. For the same reason, it is also possible to allow the thickness of the insulator layer 6 to grow gradually or continuously below the gate electrode in the direction of the drain zone 3, although this is not shown in FIG. 1.
  • the drain zone 3 can also be located higher or lower than the source zone 4.
  • FIG. 2 shows a further exemplary embodiment of the power MOSFET according to the invention, which differs from the exemplary embodiment in FIG. 1 in that the conductive connection consists of a trench 13 into which p + -conducting polycrystalline or monocrystalline silicon 14 is filled , from which a p + -conducting zone 15 has diffused into the semiconductor layer 2.
  • a dashed line 22 indicates how the thickness of the insulator layer 6 below the gate electrode 7, the underside of which is given by this dashed line 22, can continuously increase in the direction of the drain zone 3.
  • FIG. 3 shows a plan view of a large number of power MOSFETs, it being indicated here how the respective source zones 4 or drain zones 3 can be arranged, and the edge of this arrangement being designed as a source strip.
  • FIGS. 1 and 2 show a power MOSFET in which the gate electrodes are used in "traditional" Are arranged.
  • FIG. 4 shows a sectional view of a power MOSFET in which the gate electrodes 7 are accommodated in trenches 16 which are filled with insulating material 17, for example silicon dioxide, in which n + -doped polycrystalline silicon is contained. These grooves 16 extend up to a p ⁇ -lei- Tenden layer 18, the p + -type between the silicon substrate 1 and the n "-type silicon layer 2 is arranged.
  • the conductive connection between the source zones 4 and the semiconductor substrate 1 takes place here via trenches 19 which are filled with highly conductive material, such as, for example, titanium nitride 20 at their edge and in their interior with n + -conducting polycrystalline silicon 21.
  • highly conductive material such as, for example, titanium nitride 20 at their edge and in their interior with n + -conducting polycrystalline silicon 21.
  • an insulator for example silicon dioxide or silicon nitride, which can have a cavity, can also be used.
  • a metal such as tungsten, can also be introduced into the trench for the conductive connection.
  • the layer thicknesses are for example, 0.2 mm for the semiconductor substrate 1, 2 micron layer 18 for the p ⁇ -type, 3 microns for the "height" of the gate electrodes 7 and 4 microns for the n ⁇ - type semiconductor layer 2 having a resistivity of, for example, 0.5 ohm / cm.
  • the distance between the trenches 16 can be approximately 4 ⁇ m, each trench 16 having a width of approximately 1 ⁇ m.
  • the trenches 19 can also have a width of approximately 1 ⁇ m.
  • the course of the current I is indicated in FIG. 4 by a broken line: it leads from the electrode 11 through the semiconductor substrate 1, the p " -type layer 18 into the n " -line layer 2 and from there around the gate electrode 7 around to the drain zone 3.
  • the trenches 19 with the short circuit between the semiconductor substrate 1 and the source zones 4 can be arranged as desired. They can be provided, for example, in a cell-like manner between strip-shaped drain zones 3 and, if appropriate, can also be designed in the form of strips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Electrodes Of Semiconductors (AREA)
  • Insulated Gate Type Field-Effect Transistor (AREA)
EP98966510A 1998-01-14 1998-12-07 Leistungs-mosfet Withdrawn EP1048074A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19801095A DE19801095B4 (de) 1998-01-14 1998-01-14 Leistungs-MOSFET
DE19801095 1998-01-14
PCT/DE1998/003589 WO1999036961A1 (de) 1998-01-14 1998-12-07 Leistungs-mosfet

Publications (1)

Publication Number Publication Date
EP1048074A1 true EP1048074A1 (de) 2000-11-02

Family

ID=7854555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966510A Withdrawn EP1048074A1 (de) 1998-01-14 1998-12-07 Leistungs-mosfet

Country Status (5)

Country Link
US (1) US6459142B1 (ja)
EP (1) EP1048074A1 (ja)
JP (1) JP2002510147A (ja)
DE (1) DE19801095B4 (ja)
WO (1) WO1999036961A1 (ja)

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DE19801095A1 (de) 1999-07-15
JP2002510147A (ja) 2002-04-02
DE19801095B4 (de) 2007-12-13
US6459142B1 (en) 2002-10-01
WO1999036961A1 (de) 1999-07-22

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