WO2004030103A1 - Verfahren zur herstellung einer vergrabenen stoppzone in einem halbleiterbauelement und halbleiterbauelement mit einer vergrabenen stoppzone - Google Patents
Verfahren zur herstellung einer vergrabenen stoppzone in einem halbleiterbauelement und halbleiterbauelement mit einer vergrabenen stoppzone Download PDFInfo
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- WO2004030103A1 WO2004030103A1 PCT/EP2003/009494 EP0309494W WO2004030103A1 WO 2004030103 A1 WO2004030103 A1 WO 2004030103A1 EP 0309494 W EP0309494 W EP 0309494W WO 2004030103 A1 WO2004030103 A1 WO 2004030103A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 194
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 230000005855 radiation Effects 0.000 claims abstract description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 238000000137 annealing Methods 0.000 claims description 9
- 230000005669 field effect Effects 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000002800 charge carrier Substances 0.000 description 17
- 230000007423 decrease Effects 0.000 description 5
- 230000000295 complement effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004151 rapid thermal annealing Methods 0.000 description 1
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- H—ELECTRICITY
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- 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
- H01L29/7802—Vertical DMOS transistors, i.e. VDMOS transistors
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture 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
- H01L21/18—Manufacture 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
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
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- 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
- H01L29/08—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 with semiconductor regions connected to an electrode carrying current to be rectified, amplified or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
- 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
- H01L29/0873—Drain regions
- H01L29/0878—Impurity concentration or distribution
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- 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
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/167—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table further characterised by the doping material
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- 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
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- 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
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66083—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by variation of the electric current supplied or the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. two-terminal devices
- H01L29/6609—Diodes
- H01L29/66136—PN junction diodes
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- 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
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep 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
- H01L29/66234—Bipolar junction transistors [BJT]
- H01L29/66325—Bipolar junction transistors [BJT] controlled by field-effect, e.g. insulated gate bipolar transistors [IGBT]
- H01L29/66333—Vertical insulated gate bipolar transistors
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep 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
- H01L29/66409—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
- H01L29/66712—Vertical DMOS transistors, i.e. VDMOS transistors
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- 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
- H01L29/70—Bipolar devices
- H01L29/72—Transistor-type devices, i.e. able to continuously respond to applied control signals
- H01L29/739—Transistor-type devices, i.e. able to continuously respond to applied control signals controlled by field-effect, e.g. bipolar static induction transistors [BSIT]
- H01L29/7393—Insulated gate bipolar mode transistors, i.e. IGBT; IGT; COMFET
- H01L29/7395—Vertical transistors, e.g. vertical IGBT
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- 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
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- 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
- H01L29/30—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface
- H01L29/32—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by physical imperfections; having polished or roughened surface the imperfections being within the semiconductor body
Definitions
- the present invention relates to a semiconductor component, in particular a vertical power semiconductor component, having a doped first semiconductor zone of a first line type, a doped second semiconductor zone of a second line type which adjoins the first semiconductor zone and which is less doped than the first semiconductor zone, and one doped third semiconductor zone adjoining the second semiconductor zone and more heavily doped than the second semiconductor zone.
- Such a semiconductor structure is present both in the case of vertical diodes and vertical transistors and also in the case of thyristors, the second weakly doped semiconductor zone serving as a drift path which absorbs the majority of the voltage present between the first and third semiconductor zones when the component is blocked.
- the third semiconductor zone is of the same line type as the second semiconductor zone.
- the second semiconductor zone and the third semiconductor zone are usually n-doped, so that the first semiconductor zone forms the anode and the second semiconductor zone forms the cathode.
- the first semiconductor zone In the case of power MOS transistors, there is generally a field effect structure in the region of the first semiconductor zone, which is usually in the region of the front side of a semiconductor body, which has a zone of the second conductivity type which is arranged in the first semiconductor zone and is complementary to the doping of the first semiconductor zone and includes a control electrode.
- the first semiconductor zone forms the so-called body zone of the component, the one arranged in the body zone complementarily doped zone forms the source zone or emitter zone.
- the control electrode or gate electrode extends in isolation from the semiconductor zones from the source or emitter zone to the second semiconductor zone, the drift zone.
- the source zone or the emitter zone and the first semiconductor zone are usually short-circuited, so that a free-wheeling diode (body diode) is connected in parallel with the power transistor.
- the third semiconductor zone is of the same conductivity type as the second semiconductor zone or the drift zone and forms the drain zone of the component.
- the third semiconductor zone is doped complementarily to the second semiconductor zone and forms the collector zone of the semiconductor component.
- the first zone is followed by a complementarily doped zone.
- Such diodes MOSFET, IGBT and thyristors are generally known.
- EP 0405 200 AI describes such an IGBT, in the drift zone of which the source zone is preceded by a heavily doped zone of the same conduction type as the drift zone and which is intended to cause holes to be injected into the drift zone from the p-doped drain zone are not reaching the source zone, but recombine in this heavily doped zone, which in one embodiment is composed of a plurality of spaced sections.
- a very rapid decrease in the current when the component is blocked results from the fact that the second semiconductor zone is initially still flooded with charge carriers which, owing to a space charge zone that spreads out from the second semiconductor zone of the drift zone, starting from the pn junction between the first and second semiconductor zones be transported away.
- a current still flows through the connecting lines or to connected consumers, which slowly decreases.
- this current drops to a very small value with a large time gradient.
- the aim of the present invention is to provide an improved method for producing such a semiconductor component with a stop zone formed in sections and a semiconductor component produced by means of such a method.
- the method according to the invention for producing a stop zone in a doped zone of a semiconductor body comprises applying a mask having cutouts to one of the sides of the semiconductor body, irradiating the side having the mask with proton radiation and the like Performing an annealing process.
- the process with proton irradiation and the subsequent tempering creates hydrogen-induced donors in the irradiated areas, which result from the radiation-related defects and the implanted hydrogen atoms.
- the hydrogen itself is not doping.
- the position of the individual sections of the stop zone in the lateral direction of the semiconductor body in the doped semiconductor region is determined by the dimensions of the mask or of the cutouts in the mask that mask the irradiation process.
- the position of these stop zones in the vertical direction of the semiconductor body is determined by the penetration depth of the protons into the semiconductor body, which in turn depends on the radiation energy.
- Such proton radiation can be used to generate doped zones in depths of up to a few hundred ⁇ m from the irradiated side of the semiconductor body.
- the temperature and the duration of the tempering process are preferably selected such that radiation damage caused by the radiation, which reduces the service life of the carrier, is at least partially cured.
- the vertical position of the areas into which protons are introduced can be set comparatively precisely using the radiation energy. The choice of the annealing process enables well-defined doped zones, which form the sections of the stop zone, to be produced.
- RTA Rapid Thermal Annealing
- continuous furnace processes are suitable as the annealing process.
- the temperature during the tempering process is between 250 ° C and 550 ° C, preferably between 400 ° C and 500 ° C.
- the duration is between 1 min and 250 min.
- the mask for the partial proton irradiation can be a mask firmly attached to one of the sides of the semiconductor body.
- the mask can also be a metal diaphragm, which is positioned in front of the side of the semiconductor body to be irradiated, or the wafer, which has a large number of connected semiconductor components.
- the semiconductor component according to the invention comprises a doped first semiconductor zone of a first conductivity type, a doped second semiconductor zone adjoining the first semiconductor zone of a second conductivity type, which is less doped than the first semiconductor zone, a doped third semiconductor adjoining the second semiconductor zone ter zone, which is more heavily doped than the second semiconductor zone, and a stop zone of the second conduction type arranged in the second semiconductor zone at a distance from the third semiconductor zone, the stop zone being more heavily doped than regions of the second semiconductor zone surrounding the stop zone, and the distance between the stop zone and the third semiconductor zone is less than the distance between the stop zone and the first semiconductor zone.
- the stop zone is designed in sections such that it comprises a number of doped zones arranged at a distance from one another in the lateral direction of the semiconductor body, these doped zones containing hydrogen-induced donors. Between the zones of the stop zone which are laterally spaced from one another, weakly doped zones of the second semiconductor zone are arranged — these less doped zones of the second semiconductor zone form “passages” for charge carriers in the second semiconductor zone.
- the stop zone does not significantly increase the forward resistance and is particularly advantageous in the case of components which have a low doping of the second semiconductor zone or the drift zone in order to achieve good high radiation resistance.
- the stop zone is arranged approximately in the second semiconductor zone where, in the component without a stop zone, free charge carriers at the end of the clearing phase - which, starting from the pn junction between the first and second semiconductor zones be cleared - are present. This is implicitly related to the position of the stop zone.
- the stop zone is closer to the third semiconductor zone than to the first semiconductor zone, that is to say the distance between the stop zone and the third semiconductor zone is less than the distance between the stop zone and the first semiconductor zone.
- the distance between the third semiconductor zone and the first semiconductor zone is preferably more than three times the distance between the stop zone and the third semiconductor zone.
- the dimensions of the stop zone in a direction from the first to the third semiconductor zone, that is to say in the vertical direction of the component, are substantially smaller than the dimensions of the second semiconductor zone in this direction.
- the semiconductor component can be designed as a diode, with a p-doped first semiconductor zone forming this first semiconductor zone as the anode and the third semiconductor zone, which is then n-doped, forming the cathode.
- the semiconductor component can also be designed as a MOS transistor, in which case there is at least one field effect structure which comprises a zone of the second conductivity type which is arranged at a distance from the second semiconductor zone in the first semiconductor zone and a control electrode which is isolated from the semiconductor zones.
- the first semiconductor zone forms the body zone, and the zone of the second conduction type arranged in the body zone forms the source zone or the emitter zone.
- the doping type of the third semiconductor zone corresponds to the doping type of the second semiconductor zone or the drift zone, the third semiconductor zone forming the drain zone of the MOSFET.
- the doping type of the third semiconductor zone is complementary to the doping type of the second Semiconductor zone or the drift zone, the third semiconductor zone forming the collector zone of the IGBT.
- the component can of course also be designed as a thyristor.
- FIG. 1 a semiconductor component according to the invention designed as a diode
- FIG. 2 a semiconductor component according to the invention designed as a MOSFET
- FIG. 3 a semiconductor component according to the invention designed as an IGBT
- FIG. 4 an example of a doping curve in the stop zone along the section line A-A 'shown in FIGS. 1 to 3,
- FIG. 5 shows a partial section of a semiconductor component according to the invention designed as a diode (FIG. 5a) and the three-dimensional doping profile in the region of the stop zone (FIG. 5b),
- FIG. 6 a method step for producing a buried stop zone in a semiconductor component.
- FIG. 1 shows a section of a semiconductor body 10 of a vertical semi-conductor * according to the invention, which is designed as a diode. terbauelements.
- the component has a p-doped first semiconductor zone 12, which is arranged in the region of the front side 101 of the semiconductor body 10 and to which a weakly n-doped second semiconductor zone 14 is connected in the vertical direction.
- This second semiconductor zone 14 is followed in the vertical direction by a heavily n-doped third semiconductor zone 18, which forms the rear side 102 of the semiconductor body 10.
- the stop zone 16 in the second semiconductor zone 14 at a distance from the third semiconductor zone 18 there is a stop zone 16 which is more heavily doped than the remaining area of the second semiconductor zone 14 and which is of the same conductivity type as the remaining area of the second semiconductor zone 14.
- the stop zone 16 is arranged at a distance from the third semiconductor zone 18 and at a distance from the first semiconductor zone 12, the distance between the stop zone 16 and the third semiconductor zone 18 being less than the distance between the stop zone 16 and the first semiconductor zone 12 ,
- the stop zone 16 comprises a plurality of partial sections which are arranged at a distance from one another in the lateral direction of the component, so that between the individual heavily n-doped partial zones there are weaker n-doped zones of the second semiconductor zone 14 which form passages for charge carriers.
- the stop zone is n-doped, this n-doping being at least partially formed by hydrogen-induced donors.
- the first semiconductor zone 12 serves as the anode zone, and a connection 22, which is only shown schematically, accordingly forms the anode connection.
- the second semiconductor zone 14 serves as a drift zone or drift zone, which absorbs a substantial part of the applied reverse voltage in the event of blocking, and the third semiconductor zone 18, which in the case of the diode is of the same conductivity type as the drift path 14 but is complementary to the doping of the first semiconductor zone 12, serves as the cathode zone, a connection 24, which is only shown schematically, correspondingly serves as the cathode connection.
- the electrical equivalent circuit diagram of the component is shown in dashed lines in the structure in FIG. 1.
- the component When a positive voltage is applied between the anode connection 22 and the cathode connection 24, the component is operated in the direction of flow, electrons and holes being injected into the drift zone 14 and “flooding” them.
- the component locks when the voltage is reversed, i. H. when a positive voltage is applied between the cathode connection 24 and the anode connection 22.
- the stop zone 16 is arranged so that are in spreading of the space-charge zone to the last free charge carriers present, particularly in the zone 142 between the 'stop zone 16 and the emitter 18.
- free charge carriers from the more heavily doped stop zone 16 and zone 142 are also supplied. Since more charge carriers are delivered from the proposed structure with the stop zone 16 than in the case of a component in which there is no such buried stop zone, the current in the semiconductor component according to the invention decreases more slowly. In particular, the current drop shortly before the space charge zone has reached its maximum extent is less in the semiconductor component according to the invention than in conventional components of this type. Induced voltages in parasitic inductances, for example the leads, which are proportional to the discharge of the current, are therefore reduced in the component according to the invention compared to conventional components of this type.
- the section-by-section design of the stop zone 16 with intervening less heavily doped regions ensures that through the weakly doped regions there are "passages" for free charge carriers in order not to influence the charge carrier current in the drift zone 14 or only to an insignificant extent due to the presence of the stop zone.
- the stop zone is arranged in a region of the drift zone which is closer to the n-doped third semiconductor zone 18 than to the p-doped first semiconductor zone 12.
- the distance between the third semiconductor zone 18 and the first semiconductor zone 12 is preferably more than three times the distance between the stop zone 16 and the third semiconductor zone 18.
- FIG. 2 shows a semiconductor component according to the invention designed as a MOSFET, which differs from the diode according to FIG. 1 in that a field effect structure is present in the region of the front side of the semiconductor component.
- This field effect structure comprises heavily n-doped source zones 13 in the first semiconductor zone 12 serving as the body zone and at least one gate electrode 36 insulated from the semiconductor body 10 for forming a conductive channel between the source zone 13 and the drift zone 14 when applied a suitable control potential.
- the drift zone 14 extends in sections in the MOSFET between the heavily p-doped body zones 12 to the front side 101 of the semiconductor body, above which the gate electrode 36 is arranged.
- the gate electrode is arranged in a trench which extends vertically into the semiconductor body and extends into the drift zone, so that the drift zone does not occur in this exemplary embodiment extends to the front of the semiconductor body 10.
- the body zone 12 and the source zone 13 are short-circuited by a connection electrode 22, which forms the source electrode of the component.
- the heavily n-doped semiconductor zone 18 in the area of the rear side 102 of the semiconductor component serves as a drain connection.
- the gate electrode 36 is contacted by a schematically illustrated gate connection 26.
- this semiconductor component also has a stop zone 16 which is more heavily doped than the second semiconductor zone 14 and which ensures "soft shutdown" of the body diode.
- the function of this body diode corresponds to that
- FIG. 3 shows a semiconductor component according to the invention designed as an IGBT, which differs from the one shown in FIG. 2 in that the third semiconductor zone 18 in the region of the rear side of the semiconductor body 10 is p-doped in a known manner in the case of a conductive component
- FIG. 4 schematically shows the doping curve, ie the concentration N D of donors along the section line AA 'shown in FIGS. 1 to 3 in the region of the stop zone 16.
- This doping concentration is high in the region of the sections of the heavily doped stop zone 16 and corresponding between these sections low.
- Usual values for the high doping are approximately 10 16 cm "3.
- Usual values for the low doping are in the range between 10 12 cm “ 3 and 10 14 cm “3 .
- the width of the sections of the stop zone 16 can correspond approximately to the distance between these sections. However, the distance between these stop zones can also be significantly smaller than the lateral dimensions of the stop zones, as is shown in the diode according to the invention according to FIG. 5a.
- FIG. 5b shows the three-dimensional doping curve in the area of the stop zone 16 in the diode according to FIG. 5a, from which it follows that the doping in the area of the stop zone is substantially higher than the doping in the surrounding areas.
- a mask 60 having cutouts 61 to one of the sides of the semiconductor body 10 and to irradiate this side of the semiconductor body with protons.
- FIG. 6 illustrates this method step, the mask 60 having the cutouts 61 being applied to the rear side 102 of the semiconductor body in FIG.
- a metal screen can also be used, which is on or in front of the back 102 of the semiconductor body 10 is positioned. The irradiation process takes place in a process stage in which a multiplicity of semiconductor components can still be integrated together in a wafer, the metal screen being suitably positioned in front of the wafer.
- the energy with which the protons are radiated into the semiconductor body 10 is selected such that the protons penetrate in the vertical direction into the regions in which the individual sections of the stop zone are to be formed. These areas, into which the protons penetrate are denoted in FIG. 6 by the reference symbol 50.
- the proton irradiation is followed by an annealing process, the temperature and the duration of this annealing process being selected such that radiation damage in the region irradiated by the protons on their way to the regions 50 is largely healed, but that there is no significant diffusion of the radiation into the region Areas 50 of irradiated protons are carried out in order to achieve doped zones which are as narrowly delimited as possible and which form the individual sections of the later stop zone 16.
- the n-doping of these stop zone sections results from hydrogen-induced donors; the irradiated protons or hydrogen ions themselves have no doping effect.
- the radiation energy with which the protons are introduced into the semiconductor body 10 is selected such that the zones 50 with the irradiated protons lie at a desired distance from the more heavily doped third semiconductor zone 18.
- the proton irradiation causes crystal defects in the areas of the semiconductor body which are irradiated by the protons. These crystal defects lead to a reduction in the carrier lifetime, which in turn leads to an increases the forward voltage of the semiconductor device.
- annealing temperatures in the range of 500 ° C, the charge carrier life that existed before the irradiation is approximately restored.
- the temperatures present during the tempering step are therefore preferably in the range between 400 ° C. and 500 ° C.
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03798138.8A EP1540735B1 (de) | 2002-09-20 | 2003-08-27 | Verfahren zur herstellung einer vergrabenen stoppzone in einem halbleiterbauelement und halbleiterbauelement mit einer vergrabenen stoppzone |
US11/083,914 US7361970B2 (en) | 2002-09-20 | 2005-03-18 | Method for production of a buried stop zone in a semiconductor component and semiconductor component comprising a buried stop zone |
US12/039,173 US7749876B2 (en) | 2002-09-20 | 2008-02-28 | Method for the production of a buried stop zone in a semiconductor component and semiconductor component comprising a buried stop zone |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10243758A DE10243758A1 (de) | 2002-09-20 | 2002-09-20 | Verfahren zur Herstellung einer vergrabenen Stoppzone in einem Halbleiterbauelement und Halbleiterbauelement mit einer vergrabenen Stoppzone |
DE10243758.0 | 2002-09-20 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/083,914 Continuation US7361970B2 (en) | 2002-09-20 | 2005-03-18 | Method for production of a buried stop zone in a semiconductor component and semiconductor component comprising a buried stop zone |
Publications (1)
Publication Number | Publication Date |
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WO2004030103A1 true WO2004030103A1 (de) | 2004-04-08 |
Family
ID=31969324
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/009494 WO2004030103A1 (de) | 2002-09-20 | 2003-08-27 | Verfahren zur herstellung einer vergrabenen stoppzone in einem halbleiterbauelement und halbleiterbauelement mit einer vergrabenen stoppzone |
Country Status (4)
Country | Link |
---|---|
US (2) | US7361970B2 (de) |
EP (1) | EP1540735B1 (de) |
DE (1) | DE10243758A1 (de) |
WO (1) | WO2004030103A1 (de) |
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2003
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WO2007085387A1 (de) * | 2006-01-20 | 2007-08-02 | Infineon Technologies Austria Ag | Verfahren zur behandlung eines sauerstoff enthaltenden halbleiterwafers und halbleiterbauelement |
DE102007033873A1 (de) | 2007-07-20 | 2009-01-22 | Infineon Technologies Austria Ag | Verfahren zur Dotierung eines Halbleiterwafers und Halbleiterbauelement |
Also Published As
Publication number | Publication date |
---|---|
US7361970B2 (en) | 2008-04-22 |
US20050280076A1 (en) | 2005-12-22 |
DE10243758A1 (de) | 2004-04-01 |
EP1540735B1 (de) | 2017-11-01 |
US20080160732A1 (en) | 2008-07-03 |
EP1540735A1 (de) | 2005-06-15 |
US7749876B2 (en) | 2010-07-06 |
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