EP1854139A1 - Modul mit strahlungsemittierenden halbleiterkörpern - Google Patents

Modul mit strahlungsemittierenden halbleiterkörpern

Info

Publication number
EP1854139A1
EP1854139A1 EP06705951A EP06705951A EP1854139A1 EP 1854139 A1 EP1854139 A1 EP 1854139A1 EP 06705951 A EP06705951 A EP 06705951A EP 06705951 A EP06705951 A EP 06705951A EP 1854139 A1 EP1854139 A1 EP 1854139A1
Authority
EP
European Patent Office
Prior art keywords
radiation
emitting semiconductor
module according
semiconductor body
module
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Withdrawn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
EP06705951A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefan GRÖTSCH
Berthold Hahn
Stefan Illek
Wolfgang Schnabel
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.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP1854139A1 publication Critical patent/EP1854139A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/81—Bodies
    • H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/857—Interconnections, e.g. lead-frames, bond wires or solder balls
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
    • H10W90/753—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between laterally-adjacent chips

Definitions

  • the invention relates to a module with a regular arrangement of individual, radiation-emitting semiconductor bodies.
  • Publication WO 02/33756 A1 discloses an LED module which has a carrier with a planar main surface on which a plurality of LED semiconductor bodies is applied.
  • the LED semiconductor bodies are electrically connectable by means of a chip connection region, which is located between the carrier and the LED semiconductor body, and a contact surface applied to the side of the LED semiconductor body which faces away from the carrier.
  • wire connections extend from the contact surface of the LED semiconductor bodies to the chip connection region of the adjacent LED semiconductor bodies.
  • modules with radiation-emitting semiconductor bodies with small dimensions and high luminance are needed.
  • Such modules are particularly suitable as a semiconductor light source in conjunction with imaging optics such as projectors.
  • An increase in the luminance of a module of radiation-emitting semiconductor bodies can in principle be achieved by increasing the radiation density of the individual semiconductor bodies, at the same time maintaining or increasing the optical output power.
  • the area on which the radiation-emitting semiconductor bodies are arranged can be reduced.
  • Object of the present invention is to provide a module with radiation-emitting semiconductor bodies with high luminance, which has the highest possible packing density of the individual semiconductor body.
  • a module according to the invention has a regular arrangement of individual, radiation-emitting semiconductor bodies which are applied to a mounting surface of a carrier, wherein a wire connection between two adjacent, radiation-emitting semiconductor bodies is mounted on an upper side of the two radiation-emitting semiconductor bodies opposite the mounting surface. Due to an advantageous arrangement or design of the radiation-emitting semiconductor body, such a module enables a high packing density.
  • Radiation-emitting semiconductor bodies are to be understood here in particular as light-emitting diode semiconductor bodies with contact surfaces.
  • other radiation emitters can be used in the invention. This includes, among other things, in addition to light-emitting diodes in general, for example, laser diodes, Superstrahier and OLEDs.
  • the radiation emitter is preferably a diode emitting electromagnetic radiation with at least approximately Lambertian radiation characteristic, particularly preferably a thin-film light-emitting diode chip.
  • a reflective layer is applied or formed which reflects back at least part of the electromagnetic radiation generated in the epitaxial layer sequence
  • the carrier element is an element which is applied to the epitaxial layer sequence before the growth substrate is detached from the growth substrate on which the epitaxial layer sequence has been grown,
  • the epitaxial layer sequence has a thickness in the range of 20 microns or less, in particular in the range of 10 microns, and
  • the epitaxial layer sequence contains at least one semiconductor layer with at least one surface which has a diameter has, in the ideal case, an approximately ergodic distribution of the light in the epitaxial epitaxial layer sequence, that is, it has a possible ergodisch stochastic scattering behavior.
  • the semiconductor layer is made of a material comprising a compound of elements of III. and V. Main Group of the Periodic Table.
  • this layer GaAs or AlGaAs (Al x Ga ⁇ _ x As with 0 ⁇ x ⁇ 1), which of course also III-V compound semiconductor such as GaP or GaN and based thereon or derived therefrom compounds such
  • InGaAlP In x AIyGa 1 _ x _ y P with O ⁇ x ⁇ l; O ⁇ y ⁇ l
  • InGaAlN In x AIyGa 1 _ x _ y N with O ⁇ x ⁇ l; O ⁇ y ⁇ l
  • InGaAlPN in x AIyGa 1 - x n N in -yP with O ⁇ x ⁇ l; O ⁇ y ⁇ l; 0 ⁇ n ⁇ 1
  • InGaAlP In x AIyGa 1 _ x _ y P with O ⁇ x ⁇ l; O ⁇ y ⁇ l
  • InGaAlPN InGaAlPN (in x AIyGa 1 - x n N in -yP with O ⁇ x ⁇ l; O ⁇ y ⁇ l; 0 ⁇ n
  • the radiation-emitting semiconductor bodies are arranged on the carrier in accordance with a matrix of columns and rows.
  • the number of columns can correspond to the number of rows.
  • the number of columns differs from the number of rows.
  • a matrix size of 3x4, 4x3 or 16x9 can be selected. These sizes correspond to standardized TV formats, making such a module suitable for commercial projection applications.
  • matrix sizes with a higher number of radiation-emitting semiconductor bodies are also conceivable are matrix sizes with a higher number of radiation-emitting semiconductor bodies. As a result, the luminance can advantageously be increased.
  • a constant spacing between the rows and columns of radiation-emitting semiconductor bodies is achieved. chooses.
  • This distance can be 200 ⁇ m with a deviation of 5% in the tolerance range.
  • the distance lOO ⁇ m. Distances which are less than 100 ⁇ m can prove particularly advantageous.
  • the distance between the semiconductor bodies is limited by the fact that, in the case of an arrangement of more than three semiconductor bodies, a gap is to be provided next to one another for a bonding pad. This limits the packing density. In the present invention, however, a bonding pad between the adjacent semiconductor bodies is not required, since the wire connection is guided from semiconductor body to semiconductor body.
  • a plurality of bond pads can be arranged laterally downstream of the radiation-emitting semiconductor bodies.
  • the bond pads can thus advantageously be located outside the matrix of radiation-emitting semiconductor bodies.
  • a suitable, electrical connection of the radiation-emitting semiconductor body also makes possible the electrical supply of the radiation-emitting semiconductor body which is not directly adjacent to the bond pads.
  • the packing density can be increased by approximately 30% compared to a conventional module.
  • the radiation-emitting semiconductor bodies are connected in series in each case in one column of the matrix.
  • two adjacent, radiation-emitting semiconductor bodies of a column are arranged inversely to one another, that is to say that the upper side of the one radiation-emitting semiconductor body is a layer of a first conductivity type and the upper side of the radiation-emitting semiconductor body adjacent in the column is a layer of a second conductivity type having .
  • a p-layer is located on the upper side of the one radiation-emitting semiconductor body and an n-layer is located on the upper side of the adjacent, radiation-emitting semiconductor body.
  • any number of semiconductor bodies can be arranged in a column and connected in series.
  • the inversely arranged, radiation-emitting semiconductor bodies of the matrix are located on a common metallization, which is applied to the mounting surface of the carrier. More preferably, the metallization has breaks between the columns and rows. More preferably, the distance between the breaks of lines corresponds to a double line spacing.
  • the electrical connection of the radiation-emitting semiconductor body can be effected by means of the metallization and by means of wire connections.
  • the wire connections run particularly preferably above the plane in which the upper side of the radiation-emitting semiconductor body is located. This allows a simple attachment of the wire connections, since only in one plane can be operated.
  • the radiation-emitting semiconductor bodies of a column are connected in series.
  • the Columns of series-connected, radiation-emitting semiconductor body be connected in parallel.
  • the radiation-emitting semiconductor bodies are doubly contacted on the upper side, that is to say they have on the upper side " a means for n-contacting as well as for p-contact.”
  • the upper side of the radiation-emitting semiconductor bodies is structured accordingly.
  • the thin-film semiconductor bodies preferably have a radiation-generating layer sequence on which a p-type contact has been applied.
  • the radiation-generating layer sequence has an active layer containing, for example, GaN.
  • further layers may be arranged downstream of the active layer, for example a barrier layer containing TiWN, a protective layer containing Ti / Pt / Au, and a corrosion protection layer containing Au.
  • said layers may be bonded to a support member containing, for example, Ge by means of a braze containing, for example, AuSn.
  • the carrier element On the side of the carrier element which faces away from the mounting surface, it is furthermore possible to provide a protective layer containing, for example, Ti / Pt / Au, a barrier layer containing TiWN, for example, and a base metallization containing, for example, AuSb. be seen.
  • the carrier element On the side facing the mounting surface, the carrier element may comprise a layer containing Au.
  • the radiation-generating layer sequence advantageously rises as a mesa structure, so that there is space for an n-contact in addition to the mesa structure on the carrier element.
  • the radiation-emitting semiconductor bodies can be connected in series in a column by conducting a wire connection from the p-contacting of a radiation-emitting semiconductor body to the n-contacting of an adjacent, radiation-emitting semiconductor body.
  • the radiation-emitting semiconductor bodies are preferably connected to bond pads. Further advantageous interconnections are conceivable on account of the geometric arrangement and structure of the radiation-emitting semiconductor bodies.
  • a module according to the invention advantageously has a carrier which contains an electrically insulating material.
  • a support is characterized, which contains a ceramic material, for example AL2O3 or AlN.
  • the UV stability of the ceramic material can reduce the degradation of the carrier and thus increase the life of the module. This can prove to be an advantage especially when the module is used for projection applications.
  • a permanent operation with changing load for example when switching on or off, is of importance.
  • LEDs can advantageously have a lifetime (equivalent to the Half of the original value of the intensity) of 10 5 to 10 ⁇ hours.
  • the dissipation of heat which may additionally be effected by a heat sink containing a thermally conductive material, such as Al, and downstream of the carrier, have a positive effect on the life of the module.
  • a heat sink containing a thermally conductive material, such as Al and downstream of the carrier, have a positive effect on the life of the module.
  • the radiation-emitting semiconductor bodies may preferably be mounted on the carrier by means of a solder or an adhesive, particularly preferably by means of a metallization which is applied between the semiconductor body and the carrier.
  • the metallization may at least partially cover the carrier. In this case, in contrast to the embodiment described above, the metallization is not required for the electrical supply of the semiconductor body.
  • the individual, radiation-emitting semiconductor bodies or the entire module may preferably be enveloped with a molding compound.
  • Suitable materials are reaction resins such as epoxy resins, acrylic resins, silicone resins and polyurethane resins.
  • reaction resins such as epoxy resins, acrylic resins, silicone resins and polyurethane resins.
  • hybrid materials such as, for example, mixtures of epoxy resins and silicone may prove particularly suitable, with the hybrid materials having the advantage of increased UV stability, for example, over epoxy resins.
  • FIG. 1 shows a schematic plan view of a first exemplary embodiment of a module according to the invention
  • FIG. 2 shows a schematic plan view of a second exemplary embodiment of a module according to the invention
  • FIG. 3 is a schematic sectional view of the first and second embodiments
  • FIG. 4 shows a schematic plan view of a third exemplary embodiment of a module according to the invention
  • FIG. 5 shows a schematic plan view of a fourth exemplary embodiment of a module according to the invention
  • FIG. 6a is a schematic sectional view of a thin-film semiconductor body according to the fourth embodiment
  • Figure 6b is a schematic plan view of a thin-film semiconductor body according to the fourth embodiment.
  • FIG. 1 shows a first exemplary embodiment of a module according to the invention.
  • the radiation-emitting semiconductor bodies 1 are arranged regularly on a carrier 2.
  • the regular arrangement corresponds to a matrix three columns and four rows.
  • the column spacing 18 or the line spacing 17 is preferably 100 ⁇ m.
  • the radiation-emitting semiconductor bodies 1 can be contacted on two mutually opposite sides of the semiconductor body (n-contacting, p-contacting).
  • the radiation-emitting semiconductor bodies 1 are preferably arranged inversely, so that of two adjacent, radiation-emitting semiconductor bodies 1 of a column, one side of the carrier 2 facing away from the mounting surface 6 has a p-type contact, the other an n-type contact.
  • each radiation-emitting semiconductor bodies 1 of a column which are not directly connected by a wire connection, are electrically connected by a common metallization 4, which is applied to the carrier 2.
  • This metallization 4 may be strip-shaped.
  • These semiconductor bodies 1 can be applied to the metallization 4 by means of a solder or an electrically conductive adhesive.
  • an Ag or Au-containing conductive adhesive can be used for this purpose.
  • FIG. 1 A second embodiment of a module according to the invention is shown in FIG.
  • the radiation-emitting semiconductor bodies 1 are preferably located on a carrier 2 which contains an electrically insulating, preferably heat-conducting material, for example a ceramic material.
  • the radiation-emitting semiconductor bodies 1 are regularly arranged on the carrier 2, forming a 3 ⁇ 4 matrix of three columns and four rows.
  • the semiconductor bodies are arranged inversely to each other, so that of two adjacent, radiation-emitting Halbleiterk ⁇ rpern 1 of a column, one on the mounting surface facing away from a layer of a first and the other has a layer of a second conductivity type.
  • a metallization 4 is applied to the carrier 2, which preferably has an interruption between the 2nd and the 3rd line.
  • the wire connections between the radiation-emitting semiconductor bodies of a column run as in the first exemplary embodiment.
  • the semiconductor bodies of a column are thus connected in series.
  • the columns of series-connected, radiation-emitting semiconductor bodies are connected in parallel. This is done by means of the metallization 4, which has only one parallel to the lines running interruption achieved.
  • FIG. 3 shows a schematic sectional view of the first and second exemplary embodiments.
  • the section A-A runs along a column.
  • a metallization 4 is applied, which has an interruption in the middle of the carrier 2. Furthermore, bonding pads 3 are applied on the carrier 2 on the edge side. These bond pads 3 serve for the electrical connection of the radiation-emitting semiconductor bodies 1.
  • the semiconductor bodies 1 are mounted in pairs on a common metallization 4. As shown in FIG. 3, these groups of two consist of two semiconductor bodies 1 which are arranged inversely in relation to one another and are radiation-emitting.
  • the radiation-emitting semiconductor body Ia has a p-contact on the side facing away from the mounting surface and is connected to a bonding pad 3 by means of a wire connection 5. The n-contacting takes place by means of the metallization 4, on which the radiation-emitting semiconductor body is mounted by means of a solder or conductive adhesive.
  • the semiconductor body Ib has an n-contact on the side facing away from the mounting surface 6, and a p-contact on the side facing the mounting surface 6.
  • the radiation-emitting semiconductor bodies Ia and Ib are interconnected in series with one another by means of the common metallization 4, on which the two semiconductor bodies are located.
  • the radiation-emitting semiconductor body Ic is arranged inversely with respect to the radiation-emitting semiconductor body Ib.
  • the semiconductor body Id is in turn arranged inversely to the radiation-emitting semiconductor body Ic and is located therewith on a common metallization 4.
  • the electrical connection is made by means of a wire connection 5 to a bondpad 3.
  • the illustrated radiation-emitting semiconductor bodies Ia to Id are thus connected in series.
  • the wire connections 5 preferably run on the side facing away from the mounting surface 6 of the radiation-emitting semiconductor body Ia to Id and are applied to a contact surface 8 of the radiation-emitting semiconductor body 1.
  • FIG. 4 shows a third exemplary embodiment of a module according to the invention.
  • the adjacent radiation-emitting semiconductor bodies 1 of a column are arranged inversely to one another.
  • two adjacent, radiation-emitting semiconductor bodies 1 of a column are each applied to a common metallization 4.
  • not all the radiation-emitting semiconductor bodies 1 of each column are connected to one another in series.
  • the advantage of this embodiment is that a total failure of the one, a radiation-emitting semiconductor bodies 1 downstream of a defective, radiation-emitting semiconductor body can be partially prevented.
  • the radiation-emitting semiconductor bodies 1 are arranged on a common carrier 2, which preferably contains an electrically insulating material, for example a ceramic material, and in their arrangement particularly preferably follow a matrix of three columns and four rows.
  • the line spacing 17 is preferably selected to be the same size as the column spacing 18 and may be 200 ⁇ m, advantageously 100 ⁇ m, particularly advantageously less than 100 ⁇ m.
  • the columns of radiation-emitting Halbleiterk ⁇ r- pern 1 Bonding pads 3 are laterally downstream, which are applied to the carrier 2.
  • Each radiation-emitting semiconductor body 1 has two contacts on the side facing away from the mounting surface 6, an n-type contact and a p-type contact, so that two wire connections 5 are arranged on top of a radiation-emitting semiconductor body 1.
  • the adjacent radiation-emitting semiconductor bodies 1 of a column are each electrically connected to one another by means of a wire connection 5, these in each case referring to the p-contacting of the one radiation-emitting semiconductor body for n-contacting of the adjacent radiation-emitting semiconductor body, which is referred to as n Corner contact is formed, runs.
  • the radiation-emitting semiconductor body 1 of a column are connected in series.
  • the semiconductor bodies are preferably designed as thin-film semiconductor bodies, as will be explained in more detail below.
  • this embodiment of a module according to the invention enables easy attachment of the wire connections 5 on the top side.
  • FIG. 6a a thin-film semiconductor body, as can be used, for example, in the fourth exemplary embodiment, is shown in a schematic sectional view.
  • the thin-film semiconductor body has a carrier element 9, which preferably contains a semiconductor material, for example Ge.
  • a base metallization 15 for example, contains AuSb, applied, which are arranged downstream of the following layers: a barrier layer 11, which contains, for example, TiWN, to a degradation of the carrier material and a protective layer 12 containing, for example, Ti / Pt / Au.
  • the radiation-generating layer sequence has an active layer 10, which preferably contains a semiconductor material composed of a III-V compound, for example GaN or InGaN, as well as a barrier layer 11, which contains, for example, TiWN, a protective layer 12, for example Ti / Pt / Au contains, and a corrosion protection layer 13, the example Au contains.
  • the radiation-generating layer sequence with the exception of the corrosion protection layer 13, has a mesa structure that is formed during the manufacturing process. After growth of the radiation-generating layer sequence on a growth substrate, it is detached from the growth substrate, so that the layer 13 is then partially exposed.
  • the radiation-generating layer sequence is applied to the carrier element 9 by means of a brazing filler metal 14, which contains, for example, AuSn.
  • the support member 9 may have on its underside a layer, e.g. Contains Au. Through this layer on the underside, which is preferably thermally conductive, the semiconductor body may be connected to the cooling heat-conducting to a heat sink, which may have a positive effect on the life of the module.
  • the mesa structure allows on the top 16 the application of an n-type contact 8b.
  • the p-type contact 8a is applied to the radiation-generating layer sequence comprising the active layer 10.
  • the p- and n-contacts are applied in the outer regions of the thin-film semiconductor body, so that the lighting Density is minimally reduced by the shading of the wire connections 5.
  • FIG. 6b shows a schematic plan view of a thin-film semiconductor body.
  • the sectional view shows the triangular n-type contact 8b, the upper layer of the layer sequence comprising the active layer 10 and the circular p-type contact 8b.

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EP06705951A 2005-02-28 2006-02-10 Modul mit strahlungsemittierenden halbleiterkörpern Withdrawn EP1854139A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005009060A DE102005009060A1 (de) 2005-02-28 2005-02-28 Modul mit strahlungsemittierenden Halbleiterkörpern
PCT/DE2006/000232 WO2006089512A1 (de) 2005-02-28 2006-02-10 Modul mit strahlungsemittierenden halbleiterkörpern

Publications (1)

Publication Number Publication Date
EP1854139A1 true EP1854139A1 (de) 2007-11-14

Family

ID=36442045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06705951A Withdrawn EP1854139A1 (de) 2005-02-28 2006-02-10 Modul mit strahlungsemittierenden halbleiterkörpern

Country Status (8)

Country Link
US (1) US8154031B2 (https=)
EP (1) EP1854139A1 (https=)
JP (1) JP2008532299A (https=)
KR (1) KR101238981B1 (https=)
CN (1) CN100595918C (https=)
DE (1) DE102005009060A1 (https=)
TW (1) TW200711099A (https=)
WO (1) WO2006089512A1 (https=)

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DE102005009060A1 (de) 2006-09-07
TW200711099A (en) 2007-03-16
CN100595918C (zh) 2010-03-24
WO2006089512A1 (de) 2006-08-31
KR20070106624A (ko) 2007-11-02
KR101238981B1 (ko) 2013-03-08
US20080303038A1 (en) 2008-12-11
TWI332259B (https=) 2010-10-21
JP2008532299A (ja) 2008-08-14
CN101128932A (zh) 2008-02-20
US8154031B2 (en) 2012-04-10

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