WO2002005341A1 - Procede de fabrication d'un transistor de puissance au silicium - Google Patents

Procede de fabrication d'un transistor de puissance au silicium Download PDF

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Publication number
WO2002005341A1
WO2002005341A1 PCT/AM2001/000002 AM0100002W WO0205341A1 WO 2002005341 A1 WO2002005341 A1 WO 2002005341A1 AM 0100002 W AM0100002 W AM 0100002W WO 0205341 A1 WO0205341 A1 WO 0205341A1
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WO
WIPO (PCT)
Prior art keywords
substrate
silicon
layer
doped
manufacturing
Prior art date
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Ceased
Application number
PCT/AM2001/000002
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English (en)
Inventor
Gagik Ayvazyan
Armen Shaboyan
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Individual
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Individual
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Publication date
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Priority to AU2001228168A priority Critical patent/AU2001228168A1/en
Publication of WO2002005341A1 publication Critical patent/WO2002005341A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D10/00—Bipolar junction transistors [BJT]
    • H10D10/01—Manufacture or treatment
    • H10D10/051—Manufacture or treatment of vertical BJTs
    • H10D10/056—Manufacture or treatment of vertical BJTs of vertical BJTs having the main current going through the whole substrate, e.g. power BJTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D10/00—Bipolar junction transistors [BJT]
    • H10D10/01—Manufacture or treatment
    • H10D10/051—Manufacture or treatment of vertical BJTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
    • H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
    • H10D62/50—Physical imperfections
    • H10D62/53—Physical imperfections the imperfections being within the semiconductor body 
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P50/00—Etching of wafers, substrates or parts of devices
    • H10P50/60—Wet etching
    • H10P50/61—Electrolytic etching
    • H10P50/613—Electrolytic etching of Group IV materials

Definitions

  • the present invention relates to power semiconductor techniques and may be used for manufacturing of power silicon transistors.
  • power silicon transistors are manufactured on the base of silicon structure with N - N + collector junction, P "1" base and N + emitter regions.
  • the forming of their base and emitter regions is realized by successive high temperature ( 1 150 -1220°C) diffusion of acceptor and donor impurity into a comparatively higher depth (respectively 10 -15 and 35-45 ⁇ m).
  • Typical impurities employed are preferabl) aluminum, boron and gallium as acceptor one, and phosphorus - as donor one.
  • N + layer simultaneously is doped by the impurity with "compensating" atomic radius (for example, phosphorus and germanium). Germanium compensates for the atomic radius mismatch and also decreases of mechanical stress and dislocation on the interface of N - N + structures.
  • "compensating" atomic radius for example, phosphorus and germanium. Germanium compensates for the atomic radius mismatch and also decreases of mechanical stress and dislocation on the interface of N - N + structures.
  • the disadvantage of this method is high density of diffusion-induced crystallographic defects into active regions of transistors. As a result electrophysical parameters of transistor structures is impaired.
  • the other disadvantage of method is the low capability of transistors to second-breakdown, which is stipulated by an abrupt doping profile of N - N " collector junction, as it described in V. A. Belikov, V.A. Rudsky. and V.V. Togatov. Investigation of the impact of N - N junction doping " profile on capability of power transistors to second-breakdown // Electrotechnika, 7, 1991, p. 61 (in Russian). Provision of graded profile by creating of buffer epitaxial layer on the interface of N - N + collector junction, reduced the method productivity. This has been described in US Patent 5872028. 9/1996, Method of forming power semiconductor devices with controllable buffer. J.Yedinak et al.
  • N + epitaxial layer prolonged (10-14 hours) and high temperature (1200-1250°C) treatment of N - N + structures is carried out. It is supposed that there is an auto-doped of donor impurity from highly doped N ⁇ epitaxial layer to lightly doped N " silicon substrate. As a result is provided graded doping profile of N - N collector junction and therefore is increased the capability of transistors to second- breakdown.
  • the disadvantage of this method is availability of additional prolonged and high temperature treatment and high density of diffusion-induced defects (dislocations, dislocation networks, precipitates, dislocation half-loops, misfit dislocations etc.). As a result electrophysical parameters of transistor structures are impaired (for example, is decreased lifetime of minority charge carrier). Disclosure of Invention
  • the object of this invention is the improvement of electrophysical parameters of transistor structures and increase of the method productivity.
  • the porous silicon layer with the density of 1.4 + 1.6 g/sm J and depth of 10-15 ⁇ m is formed on the backside of N " silicon substrate by anodic etching before growing of the epitaxial layer.
  • PS layers are anodicly produced on the silicon samples in an electrolyte containing hydrofluoric acid. Such technology is described in Y.S. Tsou, Y. Xiao, and CA. Moore. Porous silicon. World Sci. Publ., NY. 1994, 412 p.
  • the density and depth of PS layer is proportional to the concentration of the electrolyte, current density, anodic voltage and time.
  • the high diffusion rate of impurities in PS provided necessary graded doping profile of N - N collector junction during comparative short time and low temperature treatment (for example, in process of forming P + base and N + emitter regions).
  • the auto-doped of donor impurity from highly- doped N + epitaxial layer to lightly doped N " silicon substrate can be fully combined with the above-mentioned processing. In this case there is no need to carry out additional prolonged and high temperature treatment, that will result in the increase of the method productivity. It is significant that the formation process of PS does not requiring much time and energy expenditures.
  • PS layer depth h 10-15 ⁇ m, are necessary and sufficient for providing the graded doping profile of N - N + collector junction in the process of forming base and emitter regions. This is described in V. A. Belikov, V.A. Ruds y. and V.V. Togatov. Investigation of the impact of N - N + junction doping profile on capability of power transistors to second-breakdown // Electrotechnika, 7, 1991, p. 61 (in Russian). Brief Description of Drawings
  • FIGS. 1-5 are schematic sectional view for explaining the steps of a method manufacturing of a power silicon transistor in accordance with our invention. Best Mode for Carrying Out the Invention
  • the substrate 11 of lightly doped N " -type silicon semiconductor material typically 400 ⁇ m thick, having a resistivity 60 Om.cm and a number of defects 12 within crystalline lattice is provided.
  • the substrate is provided with flat, smooth opposing top and back surfaces.
  • the PS layer 21 was formed on the backside of N " silicon substrate by anodic etching using an electrolyte containing hydrofluoric acid.
  • the substrate is first inserted within a suitable holding device and then immersed within the electrolyte. During immersion the substrate acts as an anode and a conductive member, which is likewise inserted within the electrolyte but is not readily dissoluble therein acts as a cathode.
  • anodic voltage is applied there between a reaction takes place causing gradual deep pore formation on the side wafer exposed to the electrolyte.
  • anodic etching was realized on the holding device for anodic treatment with the help of potentiostat.
  • Solution of 48% hydrofluoric acid and ethyleneglycol in proportion 1 :3 as an electrolyte was used.
  • the amperemeter and voltmeter of the potentiostat ensured the regime of anodic etching, and consequently the required density and the depth of PS layer.
  • FIG. 3 the growth of high-doped N + layer 31 on the PS layer was implemented on the vertical reactor of epitaxial setup.
  • the thickness of epitaxial layer was 180 ⁇ m, and a resistivity - 0.01 Om cm.
  • the total thickness of substrate 41 was 300 ⁇ m after one-sided lapping and polishing of the substrate. Then follow conventional steps for forming an active device within the substrate 41.
  • the P + base 51 was formed at temperature of 1220°C by successive diffusion of gallium and boron, and N + emitter 52 - by diffusion of phosphorus at the temperature of 1150°C.
  • the final depth of base region was 43.0 ⁇ 3.0 ⁇ m, and 15.0 ⁇ 0.5 ⁇ m for emitter region.
  • contacts are made to the emitter, base and collector regions. Typically, contacts to the emitter and base regions are made from the top surface and to the collector region from the back surface.
  • the lifetime of minority charge carriers was controlled in the manufacturing process of power transistor structures and the assessments of operating parameters of finished transistors was carried out.
  • the lifetime of minority charge carriers was independent from the depth of PS layer.

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Abstract

La présente invention porte sur des techniques de semi-conducteurs de puissance qui peuvent être utilisées pour fabriquer des transistors de puissance au silicium. Ce procédé consiste à produire un substrat de silicium N- légèrement dopé, former la couche de silicium poreuse sur l'arrière du substrat par gravure anodique et étirer la couche épitaxiale N+ légèrement dopée sur la couche de silicium poreuse.
PCT/AM2001/000002 2000-07-10 2001-01-10 Procede de fabrication d'un transistor de puissance au silicium Ceased WO2002005341A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001228168A AU2001228168A1 (en) 2000-07-10 2001-01-10 Method of manufacturing power silicon transistor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AM20000063 2000-07-10
AMP20000063 2000-07-10

Publications (1)

Publication Number Publication Date
WO2002005341A1 true WO2002005341A1 (fr) 2002-01-17

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Application Number Title Priority Date Filing Date
PCT/AM2001/000002 Ceased WO2002005341A1 (fr) 2000-07-10 2001-01-10 Procede de fabrication d'un transistor de puissance au silicium

Country Status (2)

Country Link
AU (1) AU2001228168A1 (fr)
WO (1) WO2002005341A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7083227B2 (en) 2002-08-29 2006-08-01 W.E.T. Automotive Systems, Ag Automotive vehicle seating comfort system
US7197801B2 (en) 2002-07-03 2007-04-03 W.E.T. Automotive Systems Ltd. Automotive vehicle seat insert
US7213876B2 (en) 2002-12-18 2007-05-08 W.E.T. Automotive System Ag Vehicle seat and associated air conditioning apparatus
US7274007B2 (en) 2003-09-25 2007-09-25 W.E.T. Automotive Systems Ltd. Control system for operating automotive vehicle components
US7338117B2 (en) 2003-09-25 2008-03-04 W.E.T. Automotive System, Ltd. Ventilated seat
US7370911B2 (en) 2003-10-17 2008-05-13 W.E.T. Automotive Systems, Ag Automotive vehicle seat insert
US7425034B2 (en) 2003-10-17 2008-09-16 W.E.T. Automotive Systems Ag Automotive vehicle seat having a comfort system
US7461892B2 (en) 2003-12-01 2008-12-09 W.E.T. Automotive Systems, A.C. Valve layer for a seat
US7478869B2 (en) 2005-08-19 2009-01-20 W.E.T. Automotive Systems, Ag Automotive vehicle seat insert
US20100017067A1 (en) * 2007-01-29 2010-01-21 Josef Kolatschek Method and control unit for triggering passenger protection means

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929529A (en) * 1974-12-09 1975-12-30 Ibm Method for gettering contaminants in monocrystalline silicon
SU1827143A3 (ru) * 1991-04-18 1996-06-27 Товарищество с ограниченной ответственностью "КМК" Способ изготовления мощного кремниевого транзистора

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929529A (en) * 1974-12-09 1975-12-30 Ibm Method for gettering contaminants in monocrystalline silicon
SU1827143A3 (ru) * 1991-04-18 1996-06-27 Товарищество с ограниченной ответственностью "КМК" Способ изготовления мощного кремниевого транзистора

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7197801B2 (en) 2002-07-03 2007-04-03 W.E.T. Automotive Systems Ltd. Automotive vehicle seat insert
US7506938B2 (en) 2002-08-29 2009-03-24 W.E.T. Automotive Systems, A.G. Automotive vehicle seating comfort system
US7083227B2 (en) 2002-08-29 2006-08-01 W.E.T. Automotive Systems, Ag Automotive vehicle seating comfort system
US7213876B2 (en) 2002-12-18 2007-05-08 W.E.T. Automotive System Ag Vehicle seat and associated air conditioning apparatus
US7274007B2 (en) 2003-09-25 2007-09-25 W.E.T. Automotive Systems Ltd. Control system for operating automotive vehicle components
US7338117B2 (en) 2003-09-25 2008-03-04 W.E.T. Automotive System, Ltd. Ventilated seat
US7356912B2 (en) 2003-09-25 2008-04-15 W.E.T. Automotive Systems, Ltd. Method for ventilating a seat
US7370911B2 (en) 2003-10-17 2008-05-13 W.E.T. Automotive Systems, Ag Automotive vehicle seat insert
US7425034B2 (en) 2003-10-17 2008-09-16 W.E.T. Automotive Systems Ag Automotive vehicle seat having a comfort system
US7578552B2 (en) 2003-10-17 2009-08-25 W.E.T. Automotive Systems Ag Automotive vehicle seat having a comfort system
US7588288B2 (en) 2003-10-17 2009-09-15 W.E.T. Automotive Systems Ag Automotive vehicle seat insert
US7461892B2 (en) 2003-12-01 2008-12-09 W.E.T. Automotive Systems, A.C. Valve layer for a seat
US7478869B2 (en) 2005-08-19 2009-01-20 W.E.T. Automotive Systems, Ag Automotive vehicle seat insert
US9440567B2 (en) 2005-08-19 2016-09-13 Gentherm Gmbh Automotive vehicle seat insert
US20100017067A1 (en) * 2007-01-29 2010-01-21 Josef Kolatschek Method and control unit for triggering passenger protection means

Also Published As

Publication number Publication date
AU2001228168A1 (en) 2002-01-21

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