WO2009036919A2 - Verfahren zur herstellung wenigstens einer strahlungsquelle - Google Patents
Verfahren zur herstellung wenigstens einer strahlungsquelle Download PDFInfo
- Publication number
- WO2009036919A2 WO2009036919A2 PCT/EP2008/007444 EP2008007444W WO2009036919A2 WO 2009036919 A2 WO2009036919 A2 WO 2009036919A2 EP 2008007444 W EP2008007444 W EP 2008007444W WO 2009036919 A2 WO2009036919 A2 WO 2009036919A2
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- WIPO (PCT)
- Prior art keywords
- edge
- mounting
- group
- emitting semiconductor
- layer
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4031—Edge-emitting structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/023—Mount members, e.g. sub-mount members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
- H01S5/02345—Wire-bonding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
- H01S5/02355—Fixing laser chips on mounts
- H01S5/0237—Fixing laser chips on mounts by soldering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02469—Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC
Definitions
- the invention relates to a method for producing at least one radiation source according to the preamble of claim 1
- edge-emitting semiconductor components emit radiation, in particular light, from a radiation exit surface which is generated in a pn (or pin) transition region of the semiconductor component and guided in a waveguide.
- the waveguide is substantially parallel to and only a few to about 10 microns away from a substantially flat base surface which at least partially forms a common, substantially straight, outer radiant exit edge with the radiation exit surface and is inclined relative to the radiation exit surface, usually below an angle of about 90 °.
- Elevations electrical insulation layers, metallic contact layers
- depressions openings in electrical insulation layers, separation trenches for separation
- the electrical contact with at least one electrical contact and the thermal connection edge-emitting semiconductor devices are fixed with their base on a mounting surface of heat sinks that meet the stated purposes, preferably cohesively and preferably with a metallic solder.
- the high-performance aspect of edge-emitting semiconductor components requires a high thermal conductivity of the heat sink, so that the device does not overheat during operation, and a high electrical conductance for low-loss power supply of the device.
- Heat sinks are usually connected to a heat sink.
- the heat sink In the case of heat sinks with convective cooling, the heat sink is a coolant that flows through the heat sink or flows through it.
- the heat sink In the case of heat sinks with conductive cooling, the heat sink is a separate heat sink body. per, on which the heat sink is releasably secured frictionally. Its contribution to cooling makes it possible in this sense to refer to the heat sink as the heat sink.
- the light beams generated by edge-emitting semiconductor devices have divergences in the pn-transition direction in the range of about 20 ° to about 120 ° in full angle.
- edge-emitting semiconductor devices are mounted close to an end face adjoining the mounting surface and inclined to the mounting surface, which at least partially forms a common, substantially straight, outer mounting edge with the mounting surface.
- the inclination of the end face relative to the mounting surface corresponds to at least half of the divergence full angle in order to avoid reflection of the emitted radiation largely.
- the end face is at least partially inclined by 90 ° relative to the mounting surface and is substantially parallel to the radiation exit surface.
- Radiation exit surface plane with the end face plane coincide with each other or are parallel to each other by a few or a few tens of microns in or against the light emission direction offset.
- a first quality criterion of the assembly of edge-emitting components in the form of a possible sharp-edged mounting edge is connected to the adjustment can be made according to the requirement.
- the deviations occurring from an ideal sharp edge along the mounting edge lie within a minimum edge radius that should be as small as possible.
- a second quality criterion for the assembly of edge-emitting components is the flatness of a linear arrangement of a plurality of emitters, which are arranged monolithically next to one another in a laser or light-emitting diode bar.
- a necessary requirement for achieving a high-level mounted laser or light-emitting diode bar or a high-level arrangement of several individual emitters side by side is a high-level mounting surface of the heat sink. Both quality characteristics are not independent of each other. If a sharp-edged mounting edge can be finished, a high-level mounting surface can also be produced. The reverse is not true.
- a third quality criterion is the long-term stability of the preferably cohesive joining connection between the heat sink and the edge-emitting semiconductor component. The key role is played by the materials involved in the connection, for example the joining component used.
- the edge-emitting semiconductor component may relatively even on thermomechanically non-matched heat sinks at elevated temperature low-voltage mounting, but the long-term and Krulastbeatik of such a compound is rather low.
- the long-term and alternating load resistance of this compound is high; however, a compound formed at an elevated temperature produces undesirable stresses in the edge-emitting semiconductor device when the heat sink has a thermal expansion coefficient that greatly differs from that of the edge-emitting semiconductor device.
- At least four types of heat sinks are known in the art for the assembly of edge-emitting semiconductor devices based, for example, on GaAs, InP or GaN.
- the strongly deviating coefficient of thermal expansion of these heat sinks prohibits the reliable connection of large-area edge-emitting electro-optical semiconductor components via a soldering or welding connection with a long-term and alternating load.
- the non-metals mentioned are usually very hard and brittle, which makes it difficult or impossible to produce a sharp-edged mounting edge on the heat sink. At the same time, the non-metals lack the good electrical conductivity, which enables a low-loss current conduction to the edge-emitting semiconductor component.
- heat sink of a highly thermally conductive composite material such as porous bodies of relatively high-temperature melting components in the cavities a relatively low temperature melting material was introduced (for example, copper tungsten, silver diamond or aluminum silicon carbide and carbon layer or fiber-based composites).
- a relatively low temperature melting material for example, copper tungsten, silver diamond or aluminum silicon carbide and carbon layer or fiber-based composites.
- the coefficient of thermal expansion of these composite materials can be adapted to those of the edge-emitting semiconductor component and thus enables a stress-free, long-term soldering or welding connection even of very large-area components.
- Such composites usually combine at least two materials with very different mechanical properties at microscopic distances, often in random distribution. Surface and edge processing of such heatsinks is therefore subject to difficulties resulting in either sharp edge fillets or edge breakouts as well as surface defects.
- a disadvantage of heat sinks according to the prior art is that none of them meets the requirement of a long-term joining zone, a high-precision assembly and sufficient electrical conductivity.
- the object of the invention is to formulate a method for producing a radiation source, in which an edge-emitting semiconductor component is connected in a material-locking manner to a heat sink and which does not have the disadvantages mentioned.
- a thermal expansion coefficient enables a low-damage and, during operation, reliable bonded connection of the edge-emitting semiconductor components to a mounting surface
- the object according to the invention is achieved by a method for producing at least one radiation source according to claim 1
- the invention is based on the introduction of an assembly body, which mediates the material bond between the edge-emitting semiconductor component and the heat sink and during operation of the Strahlungsquel- Ie at least part of the heat of the edge-emitting semiconductor device receives and at least partially emits it to the heat sink.
- the mounting body is made from a base body, of which a surface area in a first process step by electrochemical deposition of an electrolyte (in short: electrochemical, electrolytic or electro-plating) of at least one metal of the copper group (copper, silver , Gold) with a continuous metallic layer.
- This layer receives in the second process step by a shaping process, a flat mounting surface and a straight mounting edge.
- the mounting body thus formed has the required properties for reliable installation and reliable operation of the radiation source.
- the mounting body is connected in a material-bonded manner both to the edge-emitting semiconductor component and to the heat sink.
- the main body contains at least one highly thermally conductive material of a first material group comprising tungsten, carbon, silicon carbide, boron nitride, beryllium oxide and aluminum nitride.
- This inventively contained in the body high heat conductive materials have a coefficient of thermal expansion that does not deviate so much from the coefficient of thermal expansion of the edge emitting semiconductor device as that of the highly thermally conductive metals of the copper group of the periodic table of the chemical elements copper, silver and gold.
- the main body can consist partly or completely of one of the above-mentioned highly thermally conductive materials or a highly thermally conductive composite material of the named materials.
- the base body (20) then consists in terms of its volume, its mass and / or its atomic number predominantly of at least one material of the first group of materials.
- the base body can also contain a highly thermally conductive composite material of at least one material of the first material group and at least one material of a second material group, to which preferably the materials cobalt, nickel, silicon, copper, silver, and aluminum count.
- the base body then preferably consists at least partially of a composite material which contains at least one material of the first material group whose thermal expansion coefficient is smaller than the thermal expansion coefficient of the edge emitting semiconductor component and a material of a second material group whose thermal expansion coefficient is greater than the thermal expansion coefficient of the edge emitting semiconductor device.
- the basic body substantially completely consists of such a composite material, wherein the mixing ratios of the first and second material are selected such that the thermal expansion coefficient of the base body at least approximately corresponds to that of the edge-emitting semiconductor component to be mounted.
- the thermo-mechanical anisotropy of one of the materials / components it should be noted that it suffices if in at least one spatial direction, ie. H. at least one thermal expansion coefficient satisfies this condition.
- the coefficients of expansion of the base body and the semiconductor component are preferably similar in two planes that are parallel to the joining zone between the semiconductor component and the mounting body.
- Basic bodies which consist of composite materials of carbon in at least one of the modifications diamond, graphite, carbon fibers or nanotubes and silver or copper have, in addition to the coefficient of expansion matched to the edge-emitting semiconductor component, a warning characteristic.
- mica conductivity that exceeds that of copper and silver, and are therefore preferably suitable for use according to the invention.
- the base body has at least one receiving surface, which in principle can be used for mounting a lower quality of the edge-emitting semiconductor component.
- This receiving surface usually has a surface profile with a receiving surface profile depth that does not meet the requirements for a high-accuracy installation.
- the base body also preferably has at least one front surface which adjoins the receiving surface and is inclined to the receiving surface, forming with the receiving surface at least in sections a common, essentially straight, outer front edge.
- This front surface has a surface profile with a front surface profile depth. The front surface can allow the free propagation of the light beams of the edge-emitting semiconductor device at least over a certain length, without a collimation of the light beams (-bündel) must be done with a lens.
- the front edge has deviations from an ideal sharp edge, which lie within a minimal front edge radius.
- the base body has at least one support surface which can be connected to the heat sink at least thermally, if necessary also electrically.
- the invention is in principle independent of the position of the support surface with respect to the receiving surface.
- the support surface may be inclined with respect to the receiving surface or arranged in parallel in a common or in a plane offset to its plane; it may be attached directly to or spaced from it by one or more interfaces.
- the support surface can with a neighboring surface - whether the receiving surface, the front surface, an end or other side surface - have a common, at least partially substantially straight, outer support edge, which has an ideal Scharfkantig speed deviations within a minimum support edge radius lie.
- the support surface of the receiving surface is at least partially opposite.
- the support surface has a surface profile with a support surface profile depth.
- the support surface adjoins the front surface or on an end surface parallel to the front surface and forms with her the mentioned support edge.
- the front surface extends from the receiving surface to the support surface at least partially opposite the receiving surface. che. This has the advantage that the front surface of a mechanical machining is accessible, the machining tool can describe a large, and therefore highly accurate adjustable path.
- At least one contiguous metallic layer of at least one metal of the copper group of the Periodic Table of the Chemical Elements - including copper, silver and gold - is electrochemically deposited on at least the receiving surface of the base body.
- the main body forms a composite body together with the electrochemical deposited layer.
- the receiving surface preferably has the greatest possible flatness even before the electrochemical deposition in order to minimize the material requirement for metal to be deposited
- the receiving surface can also have unevenness, waviness and curvature, which are represented by the surface profile.
- a particular advantage of the invention lies in the fact that a certain degree of unevenness, undulations and curvatures is not only permissible, but even explicitly desired, if it can be unnecessary for the inventive method, costly processing step of the receiving surface before their electrochemical coating can be saved.
- the layer thickness has a value in the amount of the sum of receiving surface profile depth and a machining allowance of about 10 .mu.m to about 1 mm. Machining allowances between 100 and 300 .mu.m are particularly preferred because, on the one hand, they provide sufficient material for the shaping by mechanical processing of the deposited metal layer in the second process step according to the invention without the risk of the machining tool contacting the base body lying below the metallic layer , and on the other hand at the same time do not have more coating material than necessary.
- the base body for the electrochemical deposition of layers are mounted on a frame hung in a Gaivanikbad or can be coated in a rotating drum in the electroplating bath.
- the base body also has at least one front surface which adjoins the receiving surface and is inclined to the receiving surface and at least partially forms a common, substantially straight, external front edge with the receiving surface, it may also be advantageous to use this front surface with an electrochemically deposited layer to provide at least one of the metals copper, silver and gold.
- the layer deposited on the front surface preferably forms a unit with the layer deposited on the receiving surface and extends over the front edge at least in sections.
- the support surface of the main body may be provided with an electrochemically deposited layer of at least one of the metals copper, silver and gold. If the support surface of the receiving surface at least partially opposite and has the main body in addition to the support surface and a front surface extending from the receiving surface to the support surface and both at least partially with the receiving surface a common, substantially straight, outer front edge and the support surface at least in sections forms a common, substantially straight, outer support edge, it is advantageous that extends the electrochemically deposited metallic layer of the receiving surface on the front edge, the front surface and the support edge to the support surface.
- PVD physical vapor deposition
- CVD chemical vapor deposition
- the thin-film metallization serves - optionally separately - as an electrode for attracting metal ions from the electrolyte in the electrochemical coating and can additionally improve the adhesion of the deposited on the base metal layer.
- an electrically insulating layer to an electrically conductive base body can also serve to prepare the electrochemical deposition of the layer according to the invention. This is advantageous on the one hand, if the layer only on a limited surface area of the electric conductive body is to be applied. In this case, a structured applied electrically insulating layer serves as a mask. On the other hand, an electrical insulation layer comes into question when the electrochemically deposited metallic layer must not have an electrical connection with the electrically conductive base body. In this case, one of the electrically insulating layer applied thin-film metallization serves as an output surface for said electrodeposited layer.
- a mounting body which satisfies the requirements for highly accurate mounting of the edge-emitting semiconductor component is produced from the composite body consisting of the base body and the metallic layer deposited electrochemically thereon by shaping the metallic layer.
- At least one essentially planar mounting surface is produced, to which a substantially flat end surface inclined to the mounting surface adjoins, forming at least in sections a common, essentially straight, outer mounting edge with the mounting surface.
- This end face can be, for example, a 45 ° bevel or the 90 ° flank of a mounting surface bearing pedestal, which rises above a mechanically eroded to a greater extent region of the metallic layer.
- the mounting surface has a surface profile with a mounting surface profile depth which is preferably smaller than the receiving surface profile depth of the surface profile of the receiving surface and thus meets the requirements for a high-level mounting of the edge-emitting semiconductor component in contrast to the receiving surface of the base body.
- This surface quality of the mounting surface can be achieved by numerous mechanical processing methods. These include grinding, lapping, polishing, turning and milling.
- chip forming processes are suitable for achieving a sharp mounting edge which, compared to an ideal sharp edge, has deviations which lie within a minimum mounting edge radius which meets the requirements for highly accurate positioning and mounting of the edge emitting semiconductor component.
- the mounting edge is burr-free.
- the base body has at least one front surface which adjoins the receiving surface and is inclined to the receiving surface and at least partially forms a common, substantially straight, outer front edge with the receiving surface, then the minimum mounting edge radius of the mounting edge produced with the mechanical working of the metallic layer preferably smaller than the minimum front edge radius. If the electrochemically deposited metallic layer extends from the receiving surface beyond the said front edge to the said front surface, it is advantageous to machine the layer region deposited on the front surface mechanically in addition to the layer region deposited on the receiving surface.
- the inventive mounting surface is preferably produced by the mechanical processing of deposited on the receiving surface nen layer area and the machining of the deposited on the front surface layer area, the end face according to the invention with the mounting surface at least partially the inventive common, substantially straight, outer mounting edge forms.
- the end face has a surface profile with a Stim lakeprofiltiefe, which is preferably smaller than the front surface profile depth.
- mounting edge radii of less than 3 microns, preferably less than 1 micron can be achieved.
- the support surface of the base body has also to be provided with an electrochemically deposited layer of at least one of the metals copper, silver and gold, it is advantageous to machine the layer deposited on the support surface mechanically as well.
- the mounting surface according to the invention is preferably produced by the mechanical processing of the deposited on the receiving surface layer area and produced by the mechanical processing of the deposited on the support surface layer area a connection surface, which may be provided for the cohesive connection to the heat sink.
- the pad has a surface profile with a pad depth, which is preferably smaller than the pad depth.
- An external, at least partially straight, terminal edge which optionally has the connection surface together with an adjoining surface, for example, the mounting surface or the end face, has deviations from an ideal sharp edge, which are within a minimum connecting edge radius, which is preferably smaller as the minimum supporting edge radius.
- the mounting body for the connection to a heat sink in the third inventive step at least one connection surface, which is given by the support surface of the base body or by the connection surface of the mounting body.
- a radiation source is produced from the edge-emitting semiconductor component, the mounting body and the heat sink by providing both a first cohesive connection between the mounting body and the edge-emitting semiconductor component and a second cohesive connection between the mounting body and the heat sink.
- the radiation exit edge of the edge-emitting semiconductor component is aligned substantially parallel to the mounting edge of the mounting body.
- the base surface of the edge-emitting semiconductor component is aligned substantially parallel to the mounting surface of the mounting body.
- the edge-emitting semiconductor component is attached at least in sections cohesively to form a joining zone between the edge-emitting semiconductor component and the mounting body on the mounting surface of the mounting body, wherein the joining zone between the edge-emitting semiconductor device and the mounting body at least partially in terms of volume, mass and / or atomic number to a predominant proportion of at least one metal of the group of chemical elements of the copper group (1st subgroup of the Periodic Table of the chemical elements), the iron group (4th period of the 8th subgroup of the Periodic Table of the chemical elements) and platinum metal group (5th and 6th Period of the 8th subgroup of the Periodic Table of the Chemical Elements) and / or at least one compound of at least one metal of the group of the chemical elements of the copper group, the iron group and platinum meta llelle with at least one other metallic, semi-metallic or semiconducting material.
- the parallel projection of the radiation exit edge of the edge-emitting semiconductor component In the case of the parallel alignment of the radiation exit edge and the mounting edge, the normal projection of
- the supernatant should not be larger than 50 ⁇ m.
- the residue should in no case be greater than the waveguide distance from the mounting surface divided by the tangent of the half divergence full angle of the light beam or light beam - usually not depending on the divergence and solder layer thickness more than 50 ⁇ m.
- the parallel alignment of the base surface of the edge-emitting semiconductor component with respect to the mounting surface of the mounting body can be done before the first joining process and / or during the first joining process.
- the relative layers joining partners are fixed in the aligned state, at least with respect to their minimum inclination to each other and held substantially during the joining process.
- the first joining process can be done with or without filler materials. Welding does not require any additional materials and can be essentially based on diffusion.
- the joining surfaces have two superficially superficially diffusing materials, for example gold and gold or silver and copper.
- the joining process usually runs under heat at a Bonding temperature above room temperature or operating temperature of the mounted assembly from the assembly partners.
- the edge-emitting semiconductor component and the mounting body are preferably connected by soldering using a solder, which is brought at least in sections, preferably in the form of a solder layer between the mounting surface of the mounting body and the base of the edge-emitting device.
- a solder which is brought at least in sections, preferably in the form of a solder layer between the mounting surface of the mounting body and the base of the edge-emitting device.
- These measures include, for example, a modification of the surface with regard to its physical and / or chemical property, the application of adhesion-promoting and / or diffusion-inhibiting and / or wetting-promoting and / or diffusion-friendly thin, preferably metallic layers.
- the solder itself may be a soft solder or a brazing alloy.
- a solder is used which the skilled person selects from the point of view of the individual loadability of the joining partners during the soldering process and the individual reliability requirements in the operation of the mounted radiation source.
- these hard materials comprise the metals of the 1st and 8th subgroups of the Periodic Table of the Chemical Elements (metals of the copper group, the iron group and the platinum metal group), preferably one of the metals nickel, Copper, silver and gold, and / or compounds of these metals, preferably with a Material from the group of metallic, semimetallic and semiconducting chemical elements of the zinc group (2nd subgroup of the Periodic Table of the Chemical Elements), the boron group (3rd main group of the Periodic Table of the Chemical Elements), the carbon group (4th main group of the Periodic Table of the Chemical Elements) and the nitrogen cluster (5th main group of the Periodic Table of the Chemical Elements), preferably one of the materials zinc, gallium, indium, silicon, germanium, tin, lead and bis
- the compound is an intermetallic compound.
- the intermetallic compound particularly preferably consists of gold and tin, for example AusSn (zeta phase) and AuSn (delta phase).
- at least one metal of the 1st or 8th subgroup of the Periodic Table of the Chemical Elements or of at least one compound of these metals with at least one of the materials zinc, gallium, indium, silicon, germanium, tin, lead and bismuth extend at least in sections over the entire thickness of the soldering zone as a joining zone.
- the soldering zone refer to DIN ISO 857-2.
- a gold-tin solder is used, which particularly preferably has a higher gold than tin content in terms of mass proportions; moreover, the number of gold atoms in the solder is preferably higher than the number of tin atoms; more preferably, the gold volume in the solder is greater than the tin volume.
- This solder may be an eutectic gold-tin solder consisting of the intermetallic phases AusSn (zeta phase) and AuSn (delta phase), which contains about 80% by mass of gold and 20% by mass of tin and melts at about 280 ° C.
- the edge emitting semiconductor devices mounted on the mounting surface include single emitter lasers and light emitting diodes, multiple emitter lasers and light emitting diodes, laser and light emitting diode bars having a plurality of emitters monolithically juxtaposed in a line parallel to the radiation exit edge in the device, and Multiple arrangements of these components, which are arranged side by side in a line parallel to the mounting edge.
- the mounting body is at least partially fixed cohesively via its connection surface to form at least a second joining zone between the mounting body and the heat sink to the heat sink.
- the support surface of the main body or the connection surface of the mounting body is conditioned entprechend.
- the cohesive connection between the mounting body and heat sink apply the same measures apply as for the already-discussed cohesive connection between semiconductor device and mounting body.
- a subassembly of the radiation source is made, which consists either of semiconductor device and mounting body or mounting body and heat sink.
- the joining zone formed first is not loosened again in the subsequent joining process.
- the joining zone formed first has a preferably high proportion of high-melting compounds, in particular intermetallic compounds of at least one metal from the group consisting of the chemical elements of the copper group, the iron group and the platinum metal group with at least one material from the group of metallic, semimetallic and semiconducting chemicals Elements of the zinc group, the boron group, the carbon group and the nitrogen group, which does not melt again in the course of the thermal load of the subsequent joining process.
- the first joining process is a brazing - that is, a brazing involving or forming a braze -
- the second joining process may be a soft soldering - that is, a brazing involving a soft braze and dominating the formed braze joint. Nevertheless, even if the first solder joint does not melt, the second solder may also be brazed.
- the production method of the radiation source is completed by the attachment of a contact element to the base surface opposite side of the edge-emitting Halbleitererbauelemen- tes.
- the epitaxial side (usually the p-contact) of a laser diode element is preferably electrically contacted via the mounting body, and the substrate side of the laser diode element (usually the n-contact) via the contact element, for example a metal foil made of copper or a multiplicity of bonding wires.
- thermo-mechanical assembly suitability of the main body which lacks the mechanical properties for a surface treatment and the electrical properties for a low-loss power supply, with the mechanical suitability for surface treatment of highly electrically conductive metals of the 1st subgroup of the periodic table, which - considered in isolation - the thermo-mechanical suitability as a heat sink is missing, and a cost-effective and effective process, both elements - body and layer - to unite.
- the invention proves to be that with her a variety of mounting bodies from a common body and possibly also composite body finished.
- the base body on a first main surface on a plurality of receiving surfaces, wherein a singling of at least one receiving surface having portions of the body in composite body between the first step and the second step or during the second step or in mounting body between the second step and third step or in subassemblies after that of the first or second joining process in the third process step, which is performed first by the two joining processes.
- shaping steps which otherwise would only have to be carried out with difficulty on many small individual parts, would have to be carried out on a single large body.
- Structural features of the body such as grooves in the first major surface, or slots extending from the first to a second major surface opposite the first major surface may be utilized to at least partially pre-outline the outer contour of the future body.
- the inner wall of a groove or a slot can be a coatable front surface as the basis for the production of the end face of a singulated from the body mounting body.
- the invention additionally opens up a positive aspect from a toxicological point of view:
- Numerous beryllium compounds are known to be carcinogenic, in particular when they reach the human body, especially the lungs, in finely divided form as particles or dusts.
- the shape of a basic body of beryllium oxide ceramic can be completed already in the green state of its production on the green body, without having to make a dust-generating finishing of the fired component.
- Metallic layers according to the invention can be applied to all surface regions of the base body which are to have a desired shape. The necessary shaping can then be achieved by a mechanical treatment of the metallic layers, without the base body being touched by the processing tool and releasing carcinogenic beryllium oxide.
- FIG. 1 a shows a cross-sectional view of a composite of an edge-emitting semiconductor component and a first mounting body of a first radiation source according to the invention in an exploded view
- FIG. 1 b shows a first enlarged detail of the first mounting body according to the invention from FIG. 1 a
- FIG. 1 c shows a second enlarged detail of the first mounting body according to the invention
- 1d a cross-sectional view of the first radiation source according to the invention in a first exploded view
- FIG. 1e a cross-sectional view of the first radiation source according to the invention in a second exploded view
- 2a cross-sectional views of intermediates in the course of inventive process steps for producing a first variant of a second inventive mounting body from a base body and for highly accurate mounting of an edge-emitting semiconductor device on this mounting body for a second radiation source according to the invention.
- 2b is a cross-sectional view of a second variant of the second mounting body according to the invention
- 2c shows a cross-sectional view of a third variant of the second mounting body according to the invention
- FIG. 4a shows a plan view of a base body for producing a plurality of fourth mounting bodies according to the invention
- 4b is a plan view of a first side of a composite of the base body and according to the invention on these applied metallic layers for producing a plurality of the fourth inventive mounting body
- FIG. 4c is a plan view of a second, opposite the first side, a composite of the main body and according to the invention applied thereto metallic layers for producing a plurality of the fourth mounting body according to the invention
- Figure 4d is a plan view of a copy of the composite of the Basic body and according to the invention on these applied metallic layers according to the invention produced fourth mounting body according to the invention
- 4e is a side view of the fourth mounting body according to the invention.
- 4f shows a side view of a composite produced according to the invention from the fourth mounting body according to the invention and an edge-emitting semiconductor component
- FIG. 5 a shows a side view of a fifth mounting body according to the invention whose inventive manufacturing method is analogous to that of the fourth mounting body according to the invention
- FIG. 5 b shows a side view of a composite produced according to the invention from the fifth mounting body according to the invention and an edge-emitting semiconductor component.
- connection surface
- connection surface 42 end face 43 connection surface, connection surface
- Figures 1a to 1c illustrate in cross-sectional view in which the cross-sectional hatching omitted for clarity, and sections X and Y thereof of a composite of an edge-emitting semiconductor device (10) and a first mounting body (40) according to the invention in an exploded view of a first Ausf ⁇ hrungsbeispiel for Application of the method according to the invention to an aluminum nitride ceramic base body (20), which has a thin-film metallization of 200 nm CrNi and 200 nm Au physically deposited from the vapor phase on a receiving surface (21).
- This thin-layer metallization closes flush with the front edge (25), which is formed flush with the front surface (22) and adjoins the receiving surface and adjoins the receiving surface (21), flush and almost flush as electrode in the electrochemical deposition of a 300 .mu.m thick metal layer (31) made of copper.
- electrochemically deposited copper material volume of the layer (31) also extends beyond the front edge (25) on the front side.
- the copper metal layer (31) is mechanically processed in four steps:
- a first step its upper side, which extends parallel to the receiving surface (21), is roughly mechanically milled off, with approximately 100 ⁇ m of copper material being removed.
- the metallic layer (31) is lapped flush with the front side (22) at the front.
- a step-like shoulder is introduced into the metallic layer on the front side by means of milling, which has an end face (42) which is set back substantially parallel to the front side (22) and by approximately 100 ⁇ m, and a shoulder surface (FIG. 44) which is substantially parallel to the receiving surface (21) and is spaced from it by about 100 ⁇ m.
- a fourth step the upper surface of the copper layer parallel to the receiving surface (21) is machined mechanically in a polishing process to create a high-level mounting surface (41).
- any burrs that may have been produced during the production of the heel are removed at the mounting edge (45) and a straight mounting edge (45) with a small edge radius is created at the interface between the mounting surface (41) and the end face (42).
- the receiving surface profile depth (28) of the surface profile (27) of the receiving surface (21) is significantly greater than the mounting surface profile depth (48) of the surface profile (47) of the mounting surface (41 ), wherein the two surface profiles (27, 47) increased by a factor of 20 compared to the thickness of the metal layer (31) are shown.
- the receiving surface profile depth (28) is 10 .mu.m
- the mounting surface profile depth (48) is 2 .mu.m.
- the high flatness of the mounting surface (41) represented by this mounting surface profile depth (48) is outstandingly suitable for the parallel alignment of the base surface (11) of a laser diode bar (10), which has a radiation exit surface (12) which adjoins the base surface (11), is inclined relative to it at an angle of approximately 90 ° and forms a common, essentially straight, outer radiation exit edge (15) with the base surface (11).
- This radiation exit edge (15) can be excellently aligned parallel to the manufactured sharp-edged mounting edge (45), whereby the highly accurate position of the laser diode bar (10) with respect to the mounting body (40) is predetermined.
- An analogous alignment procedure is equally applicable to light emitting diode bars (10) or one row of a plurality or a plurality of single emitter laser or light emitting diodes (10) or a row of a plurality or a plurality of multiple emitter laser or light emitting diodes (10).
- a solder (50) is brought between the base surface (11) of each edge-emitting semiconductor component (10) and the mounting surface (41) of the mounting body (40) ;
- the solder is evaporated on the mounting surface (41) of the mounting body (40), which has been previously provided with a metallization suitable for the solder.
- the base surface (11) of the edge-emitting semiconductor component (10) has a metallization suitable for the solder.
- the solder is preferably a gold- and tin-containing solder whose gold content is greater in terms of weight fractions than the tin content.
- the laser diode bar (10) with its base (11) highly accurately soldered to the mounting surface (41) of the mounting body (40) in a soldering process and firmly bonded to the mounting body.
- a variant of the first embodiment provides a base body (20) which has a plurality or a plurality of electrochemically deposited on its receiving surface (21) metallic layers (31) which are electrically separated from each other.
- FIG. 1d illustrates a first order according to the invention for carrying out the first and second joining processes.
- the laser diode bar (10) is in the first joining process with the soldering process described above materially connected to form a joining zone (55) with the mounting body (40), whereby a corresponding subassembly (60) of the diode laser (90) was prepared.
- the mounting body is connected via its support surface (23) by means of a soft solder (51) to a heat sink (70) made of copper.
- a metallic plate is fastened as a contact body (80) on the side of the laser diode bar (10) opposite the base surface by means of an electrically conductive joining means (52).
- the joining means (52) may be, for example, an electrically conductive adhesive.
- the third joining process may precede the second joining process.
- FIG. 1e illustrates a second sequence according to the invention for carrying out the first and second joining processes.
- the mounting body (40) is connected to the heat sink (70) via its support surface (23) by means of a gold-tin solder to form a solder joint (56) with the refractory ⁇ phase AusSn, thereby forming a subassembly ( 61) of the diode laser (90).
- the metallic plate is connected as a contact body (80) with the base surface (11) opposite side of the laser diode bar (10).
- the metallic plate (80) for example a metal foil, in the direction perpendicular to the base plane is so flexible that the laser diode bar in the subsequent first joining process in which the composite body of laser diode bars (10) and contact body (80) over the base (11).
- the laser diode bar (10) is connected to the mounting surface (41) of the sub-assembly (61) by means of a gold-tin solder (50), can adapt to the flat surface contour of the mounting surface (41).
- the heat sink (70) has at least one heat-spreading section (71) which differs with respect to the plane of the radiation exit surface (15) in a light emission direction which is remote from the edge-emitting semiconductor component (10) Mounting body (40) protrudes.
- 1 f shows, with a cross-sectional detail, a variant of the first mounting body (40) in which the cross-sectional hatching has been omitted for the sake of clarity, with an alternative embodiment of the end face (42).
- the copper volume of the layer (31) projecting beyond the front surface (22) is first removed by means of a grinding or lapping process. Subsequently, the copper layer (31) with the aid of a Diamantfrästechnikmaschinections front of a 150 ⁇ m chamfer, which at 45 ° relative to the sacredflä- che (21) is inclined.
- a second mounting body of a cuboid base body (20) of a copper-tungsten composite material of the width of 11mm the length of 5mm and the thickness of 0.5mm is assumed, whose cross-sectional view not to scale in FIG 2a is shown.
- the main body has a substantially flat receiving surface (21) with a surface profile, the receiving surface profile depth is 10 microns.
- Adjoining the receiving surface (21) is a substantially flat front surface (22), which is inclined at an angle of 90 ° relative to the receiving surface (21) and has a common frontal edge (25) which is substantially straight at least in sections with the receiving surface (21) ).
- the front surface (22) has a surface profile with a front surface profile depth of 20 ⁇ m.
- the front edge (25) has chipping and rounding, due to which the front edge (25) is not ideal sharp-edged.
- the deviations occurring from an ideal sharp edge along the front edge (25) lie within a minimum front edge radius of 10 ⁇ m.
- the front surface (22) is adjoined by a support surface (23) opposite the receiving surface (21), which is inclined by 90 ° with respect to the front surface (22) and has a common support edge, at least partially substantially straight, lying opposite the front surface (22). 26).
- the support surface (23) has a surface profile with a Stützflä- chenprofiltiefe of 10 .mu.m.
- the support edge (26) has cutouts and fillets, due to which the support edge (26) is not ideally sharp.
- the cuboid base body (20) is electrochemically coated in the first step of the invention in a rotating drum in a galvanic bath together with a plurality of other parallelepiped base body (20) on its entire outer surface with copper.
- a cross-sectional view of the formed composite (30) of base body (20) and deposited copper layer (31) is shown in Fig. 3.
- the thickness of the electrodeposited copper layer (31) is substantially 200 ⁇ m. Only at the edges is due to the increased relative to the surfaces of electrical Field strength in the electrochemical coating to record a thickening of the layer to 300 .mu.m.
- a portion of the copper layer (31) which has been deposited on the support surface (23) is used to remove 100 ⁇ m copper material by means of a diamond milling tool.
- a portion of the copper layer (31) which has been deposited on the front surface (22) is removed by cutting with a diamond milling tool 100 ⁇ m copper material.
- a portion of the copper layer (31) which has been deposited on the receiving surface (21) is used to remove 100 ⁇ m copper material by means of a diamond milling tool.
- a mounting body (40) has been produced, which has a resulting by the machining of that portion of the copper layer (31), which has been deposited on the receiving surface (21) mounting surface (41) having a surface profile with a Mounting surface profile depth of 1 micron.
- the mounting surface (41) is followed by a substantially flat end surface (42) which is inclined at an angle of 90 ° relative to the mounting surface (41) and which has been formed by the mechanical machining of that region of the copper layer (31) which is located on the front surface (22) was deposited, and with the mounting surface (41) forms a common, at least partially substantially straight outer mounting edge (45).
- the end face (42) has a surface profile with an end profile depth of 2 ⁇ m.
- the mounting edge (45) is substantially free of chipping and rounding, so that the mounting edge (45) is almost perfectly sharp.
- the deviations occurring from an ideal sharp-edged edge along the mounting edge (45) lie within a minimum mounting edge radius of 2 ⁇ m.
- Adjoining the end surface (42) is a connection surface (43) opposite the mounting surface (41), which is inclined relative to the end surface (42) by an angle of 90 ° and with the end surface (42) a common, at least partially substantially straight, outer terminal edge (46) forms.
- the pad (43) was made by machining the portion of the copper layer (31) deposited on the support surface (23), and has a surface profile with a pad profile depth of 1 ⁇ m.
- the burr resulting from the second mechanical machining step at the connecting edge (46) is removed with the aid of a grinding tool, so that the deviations occurring from an ideal sharp edge along the connecting edge (46) are within a minimum connecting edge radius of 5 .mu.m.
- the mounting body (40) electrochemically deposited on the base body (20) according to the invention in the second method step according to the invention has a width of 11.6 mm, a length of 5.4 mm and a thickness of 0.7mm.
- the copper layer thickness still present on the base body after mechanical processing amounts to 100 ⁇ m on the surface of the mounting surface, 100 ⁇ m on the surface side and 100 ⁇ m on the surface side.
- a composite (60) is produced from the mounting body (40) and a laser diode bar (10) of 10 mm width and 1.5 mm resonator length by soldering by means of a solder, in which the base area (11) of the laser diode bar (10 ) is joined to the mounting surface (41) via a solder layer (50).
- the mounting surface (41) after it has been prepared for the soldering process, coated in a section that extends to the mounting edge, with 3 microns of eutectic gold-tin solder, in which the weight fraction of the gold is 80%.
- the radiation exit surface (12) adjoining the base surface (11) of the high-power laser diode bar (10) forms an angle of 90 ° with the base surface and a common substantially straight radiation exit edge (15).
- the radiation exit edge (15) of the laser diode bar (10) is aligned substantially parallel to and up to a supernatant of 10 microns flush with the mounting edge (45) and the mounting surface (41) facing the base surface (11) parallel to the mounting surface (41).
- the radiation exit surface (12) is thus substantially parallel to the end face (42).
- the high assembly precision achieved in the method according to the invention has a particularly positive effect on the reliable homogeneity of the power parameters of the emitters of the laser diode bar (10).
- the attachment according to the invention of the mounting body to a heat sink is not shown in Fig. 2a and in the following figures 2b and 2c.
- the method according to the invention described in the second embodiment can also be applied to base bodies (20) which consist of an electrically insulating material, for example of beryllium oxide, aluminum nitride, boron nitride, vanadium-doped silicon carbide or diamond.
- a metallization is applied to the entire surface of the non-conductive base body (20) before the electrochemical deposition, for example by deposition from the vapor phase.
- This metallization may comprise, for example, a layer system consisting of a first layer of titanium, a second layer of platinum and a third layer of gold each 100 nm thick and serves as an electrical contact and starting layer for the described inventive electrochemical deposition.
- FIGS. 2b and 2c Examples of second and third variants of the second embodiment with a second mounting body according to the invention are shown in FIGS. 2b and 2c for a base body (20) made of a silver-diamond composite material 11 mm wide, 8 mm long and 1 thick, 5mm.
- the base body (20) in contrast to the base body (20) of the first variant, has a front surface (22) which is not inclined by 90 ° with respect to the receiving surface (21) and only by 45 ° forms with the receiving surface (21) a common, at least partially substantially straight outer edge front edge (25) with blunt 135 ° angle.
- An end face (24) adjoins the front face (22) at a 45 ° angle to the front face (22) in a direction away from the front edge (25).
- the front surface (22) thus forms a 0, 7mm-45 ° bevel on the receiving surface (21).
- the support surface (23) faces the receiving surface (21) at least in sections and forms with the end surface (24) a common 90 ° support edge (26).
- the region of the silver layer (31) which has been deposited on the receiving surface (21) is machined mechanically.
- a mounting body (40) whose end face (42) in contrast to the mounting body (40) of the third embodiment, an end face (42) which is not inclined by 90 ° relative to the mounting surface (41) but only 45 ° and with the mounting surface (21) forms a common, at least partially substantially straight outer mounting edge (45) with blunt 135 ° -Winkei.
- the area of the mounting body (40) extending away from the mounting edge in the mounting surface (41) improves the heat spread for a laser diode bar soldered to the mounting edge (45) on the mounting surface (41) whose beam divergence angle is perpendicular to the mounting surface (41 ) is less than 90 °, which is why during operation of the laser diode bar no or only a very small proportion of the emitted light rays strike the end face.
- the base body (20) has a front surface (22) which, like the front surface (22) of the base body (20) of the first variant, is inclined by 90 ° with respect to the receiving surface (21) but just as little as the front surface (22) of the main body of the previous first Variation over the full distance between receiving surface (21) and support surface (23) extends, but only over a pitch of 0.5mm, wherein the front surface (22) via the detour of a plurality of adjoining first, second and third end surfaces (24a, 24b , 24c) is separated from the support surface (23).
- the first end face (24a) is parallel to the receiving surface (21) and forms with the front surface (22) one of the front edge (25) opposite, inner 90 ° edge.
- the second end surface (24b) adjoining the first end surface (24a) in a direction away from the front surface is inclined at 45 ° with respect to the first end surface (24a) and forms a common, external 135 ° edge with the first end surface (24a)
- the third end face (24c) adjoining the second end face (24b) in a direction away from the first face (24a) is inclined at 45 ° with respect to the second end face (24b) and forms a common, outer face with the second end face (24b) 135 ° edge.
- the third end surface (24c) forms, with the support surface (23) opposite the receiving surface (21), a common, outboard 90 ° support edge (26) opposite the 135 ° edge with the second end surface (24b).
- the three end faces (24a, 24b, 24c) describe a projection of the main body (20) which is stepped in relation to the receiving surface (21) and extends in the front-side direction with respect to the front edge (25) and faces the receiving surface (21) in a plateau-like manner the predetermined by the front side (22) partial distance rises.
- the first silver layer (31) according to the invention is not applied electrochemically over the entire surface, but only on the receiving surface (21), the front surface (22) and the first end surface (24a).
- a second silver layer (32) is electrochemically deposited on the support surface (23).
- the remaining surface areas are protected from coating by a resist in the electroplating bath.
- the second silver layer (32) is first of all mechanically processed, which was deposited on the support surface (23).
- the region of the first silver layer (31) which has been deposited on the front surface (22) and the first end surface (24a) is mechanically planarized.
- the region of the first silver layer (31) which has been deposited on the receiving surface (21) is machined mechanically.
- a mounting body (40) whose outer contours correspond in principle to those of the base body, wherein the shaped end face (42) parallel to the front surface (22) and with the mounting surface (41), which is parallel to the receiving surface (21) a common , straight mounting edge (45) forms.
- the heat sinks (70) are laminates of a composite of aluminum nitride and copper layers, in which a microchannel structure is introduced into copper layers, which are arranged between two aluminum nitride layers, via an inlet in conjunction with an inlet of the Heatsink (70) is connected and via a drain in conjunction with an outlet.
- coolant is introduced into the microchannel structure via the inlet and removed again via the outlet from the microchannel structure.
- a third embodiment of the production method of a radiation source (90) according to the invention relates to the production of a diode laser stack (90), intermediates of which are shown in cross-sectional view in FIG.
- a base body (20) is a diamond square of dimensions 0.9 x 0.8 x 11 mm 3 with a receiving surface
- Front surface (21) and support surface (23) are opposite each other and each with respect to the receiving surface (21) inclined by 90 °.
- the cuboid is initially provided with a thin-layer metallization of 60nm Ti, 100nm Pt and 100nm Au between two circumferentially closed circumferential lines spaced 10mm apart; Subsequently, a 300 ⁇ m thick copper layer 31 is electrochemically deposited on the thin-film metallization to produce the composite body (30).
- All four coated rectangular areas are subjected to a surface treatment, wherein the layer area on the receiving surface (21) to a flat mounting surface (41), the layer area on the front surface (22) to a flat end face (42), the layer area on the support surface (23). to a flat connection surface (43) and arranged on the opposite surface of the receiving surface layer region to a flat contact surface (49).
- the mounting surface (41) has with the 90 ° to its inclined end face (42) has a common straight mounting edge (45) and with the 90 ° in the opposite direction to its inclined, the end face opposite terminal surface (45) has a common terminal edge (46 ).
- the mounting body thus has the dimensions of 1, 3 x 1, 2 x 10 mm
- first joining process for connecting a 10mm wide laser diode bar of 0.6 mm resonator length with the mounting surface (41) by means of a gold-tin solder 50 under training a soldering zone 55 and the second joining process for connecting the mounting body (40) via its connection surface (43) by means of a gold-tin solder (51) to form a soldering zone (56) with a microchannel cooler (70) which consists at least partially of silicon , connected.
- the adjacent mounting body (40) is a contact body (80) which in turn carries an operable laser diode bar (10).
- the alignment of the radiation exit edge of the laser diode bar (10) to the mounting edge (45) is effected by a stop on which both the radiation exit surface (12) and the end face (42) abut.
- Predetermined breaking points between the emitters of the laser diode bar (10) allow a by the opposite to the laser diode material lower thermal expansion coefficient of the mounting body induced controlled breakup of the laser diode bar in individual laser diodes during cooling towards the end of the joining processes. Because of the presumed electrical isolation capability of the heat sink (70), the laser diode bars (10) of the diode laser stack (90) via the mounting body (40) are electrically connected in series.
- the fourth embodiment relates to a preferred inventive method for manufacturing a plurality of mounting bodies (40) according to the invention from a single body (20). Individual steps of this process are illustrated by FIGS. 4a to 4d.
- a plate-shaped base body (20) has a first main surface and a second main surface opposite the first main surface.
- Such a base may be, for example, a plate of chemical vapor deposited (CVD) diamond, a plate of tungsten-copper composite or a diamond-silver composite.
- a field of recesses is introduced into the plate-shaped base body, which in the case of the present embodiment in the form of slots (29) extending from the side of the first main surface through the plate-shaped base body to the second main surface.
- the slots (29) are straight at least in sections along a preferential direction and in the at least one straight slot section have a pair of opposed inner surfaces extending in the preferential direction and from the first to the second major surfaces. Between two adjacent slots (29) having substantially parallel straight slot portions, portions of the first major surface extend from a common edge to a first inner surface of a first slot along the length of a first edge distance to a common edge to a second inner surface of a second slot.
- portions of the second major surface extend from a common edge to the first inner surface of the first slot along the length of a second edge distance to a common edge with the second inner surface of the second slot.
- Said sections of the first main surface comprise at least one receiving surface according to the invention of the base body (20).
- the said sections of the second main surface comprise at least one support surface according to the invention of the base body (20).
- a first receiving surface (21) extends from the edge to the first inner surface of the first slot over approximately a first half of the length of the first edge distance toward the second slot.
- the first inner surface thus assumes the function of the front surface (22), its edge with the first receiving surface (21) the function of the front edge (25).
- a second receiving surface extends between the first receiving surface and the second slot for about a second half of the length of the first edge distance to the edge of said Ab- section of the first major surface with the second inner surface of the second slot.
- the second receiving surface does not touch the first receiving surface (21).
- the support surface extends from the edge with the first inner surface of the first slot over the entire length of the second edge distance to the edge with the second inner surface of the second slot.
- a first interconnected copper layer (31) is applied electrochemically to each section of the main body that lies between two adjacent slots.
- the copper layer (31) extends from the first main surface to the second main surface, from the first receiving surface (21) over the first inner surface of the first slot to the support surface (23) and there over almost the entire length of the second edge distance in the direction of the second slot, but without reaching the edge of said portion of the second major surface with the second inner surface of the second slot.
- a second copper layer (32) is electrochemically applied to a portion of the second receiving surface that is spaced from the edge with the second inner surface.
- the first method step may be preceded by a full-area or selective thin-layer metallization with the base body, preferably including the inner surfaces of the slots (29), in particular if the base body consists of electrically insulating material or carries an electrically insulating coating.
- full-surface thin-film metallization or base body made of electrically conductive material the areas not to be coated away from the receiving surfaces, the support surface and the first inner surface of the slot are protected from coating by a resist in the electroplating bath.
- the metallization takes place at least on the regions of the receiving surfaces to be electrochemically coated, the support surfaces (23) and the first inner surface of the slot.
- self- understandably mixed variants with selective coating and selective coverage possible preferably when these measures are profitable from a manufacturing point of view.
- first the layers or layer areas deposited electrochemically on the first and second main surfaces are machined on the surface, whereby on the side of the first main surface those layer regions deposited on the first receiving surfaces become high-level mounting surfaces (41) according to the invention on the side of the second main surface, those layer regions which have been deposited on the support surfaces become plateaus (43) according to the invention.
- the layers (32) deposited on the same main surface as the first receiving surfaces, namely on the second receiving surfaces also receive a high surface in the mechanical working process on the first major surface.
- FIGS. 4d and 4e there are three variants of the method, the results of which are shown in FIGS. 4d and 4e.
- a first variant of the method the production of the mounting edges (45) with mechanical processing of the first metallic layers (31) in a first Step followed, followed by a second step of separating the mounting body (40) from the basic body-layer composite.
- the singulation of partial bodies from the basic body / layer composite can first take place, followed by the production of the assembly edges by mechanical processing of the first metallic layers (31) in a second step.
- the separation of the assembly bodies from the basic body-layer composite can be combined with the simultaneous mechanical processing of the first metallic layers (31) to produce the assembly edges - for example by sawing or wire eroding.
- the partial bodies can be stacked after separation in a manner such that the terminal surface (43) of a first partial body rests on the mounting surface (41) of a second partial body and all the layer regions of the first metallic layer (31) deposited on the first inner surface of the slots (29) lie on a common side of the stack.
- the sub-bodies of the stack can be aligned with a flat surface that abuts all the uncoated second inner surfaces of the slots (29).
- those layer regions of the first metallic layer (31) which have been deposited on the first inner surfaces of the slots (29) can be machined in a single operation to face surfaces (42) which are mechanically raised Mounting surfaces (41) the common, essentially Chen straight, outer mounting edges (45) form and with the connection surfaces (43) the inventive common, substantially straight, outer terminal edges (46).
- the assembly according to the invention of at least one laser diode bar (10) forms a joining zone (51) on the mounting surface (41) on the mounting edge (45) of each mounting body (40) to form the sub-assembly (60) produced according to the invention.
- Fig. 4f of a diode laser (90).
- the metallic layer (32) can serve as an electrical contact, from which electrical contact elements (81) - in this case, bonding wires - establish an electrical connection with a contact surface opposite the base surface and opposite the base surface (11).
- the mounting body (40) is then attached to the completion of the diode laser (90) by its connection surface (43) cohesively and operatively connected to a power supply and heat sink, not shown.
- Fig. 5a shows a mounting body, which was made analogous to the mounting body of the fourth embodiment of a common base body.
- the main body is electrically insulating at least externally.
- the mounting body of the present embodiment has two metallic layers (31, 32), of which a first metallic layer (31) as in the fourth embodiment of the receiving surface (21) over the first inner surfaces of the Base body existing slot (29) on the support surface (23) extends. There, however, does not extend the metallic layer (31) as in the fourth embodiment over almost the entire length of the second edge distance in the direction of the second slot, but only over about a first half of the length of the second edge distance in the direction of the second slot.
- the second metallic layer (32) extends in contrast to the fourth embodiment over the entire second receiving surface and from there via the second inner surface of the second slot on the support surface (23) on which it extends in the direction of the first inner surface of the first slot about a second half of the length of the second edge distance without reaching the first metallic layer (31).
- the two metallic layers (31, 32) form two electrically separate conductor tracks, which both extend from one side opposite the support surface (23) onto the support surface (23) and provide there two electrically isolated connection surfaces (43).
- the assembly according to the invention at least laser diode barrens (10) to form a joining zone (51) on the mounting surface (41) of the first metallic layer (31) on the mounting edge (45) of the mounting body (40) forms a subassembly (60, Fig. 5b).
- a diode laser produced according to the invention (90), in which extend from the deposited on the second receiving surface area of the second metallic layer (32) bonding wires (81) as electrical connecting elements to one of the base surface (11) and the base surface (11) opposite pole contact surface of the laser diode bar (10) ,
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Priority Applications (1)
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DE112008002436T DE112008002436A5 (de) | 2007-09-13 | 2008-09-11 | Verfahren zur Herstellung wenigstens einer Strahlungsquelle |
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DE102007043580 | 2007-09-13 | ||
DE102007043580.2 | 2007-09-13 |
Publications (2)
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WO2009036919A2 true WO2009036919A2 (de) | 2009-03-26 |
WO2009036919A3 WO2009036919A3 (de) | 2010-02-25 |
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PCT/EP2008/007444 WO2009036919A2 (de) | 2007-09-13 | 2008-09-11 | Verfahren zur herstellung wenigstens einer strahlungsquelle |
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DE (1) | DE112008002436A5 (de) |
WO (1) | WO2009036919A2 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180090908A1 (en) * | 2015-04-30 | 2018-03-29 | Osram Opto Semiconductors Gmbh | Arrangement Having a Substrate and a Semiconductor Laser |
DE102018210141A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung und Verfahren zur Herstellung einer Diodenlaseranordnung |
DE102018210136A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0949727A2 (de) * | 1998-04-08 | 1999-10-13 | Fuji Photo Film Co., Ltd. | Wärmesenke und Verfahren zur Herstellung |
US5985684A (en) * | 1996-04-30 | 1999-11-16 | Cutting Edge Optronics, Inc. | Process for manufacturing a laser diode having a heat sink |
US20050168950A1 (en) * | 2004-01-30 | 2005-08-04 | Hokichi Yoshioka | Semiconductor cooling device and stack of semiconductor cooling devices |
-
2008
- 2008-09-11 DE DE112008002436T patent/DE112008002436A5/de not_active Withdrawn
- 2008-09-11 WO PCT/EP2008/007444 patent/WO2009036919A2/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5985684A (en) * | 1996-04-30 | 1999-11-16 | Cutting Edge Optronics, Inc. | Process for manufacturing a laser diode having a heat sink |
EP0949727A2 (de) * | 1998-04-08 | 1999-10-13 | Fuji Photo Film Co., Ltd. | Wärmesenke und Verfahren zur Herstellung |
US20050168950A1 (en) * | 2004-01-30 | 2005-08-04 | Hokichi Yoshioka | Semiconductor cooling device and stack of semiconductor cooling devices |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180090908A1 (en) * | 2015-04-30 | 2018-03-29 | Osram Opto Semiconductors Gmbh | Arrangement Having a Substrate and a Semiconductor Laser |
DE102018210141A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung und Verfahren zur Herstellung einer Diodenlaseranordnung |
DE102018210136A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung |
US11824324B2 (en) | 2018-06-21 | 2023-11-21 | Trumpf Photonics, Inc. | Diode laser arrangement and method for producing a diode laser arrangement |
Also Published As
Publication number | Publication date |
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WO2009036919A3 (de) | 2010-02-25 |
DE112008002436A5 (de) | 2010-12-23 |
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