WO2005043636A1 - 発光素子 - Google Patents
発光素子 Download PDFInfo
- Publication number
- WO2005043636A1 WO2005043636A1 PCT/JP2004/016346 JP2004016346W WO2005043636A1 WO 2005043636 A1 WO2005043636 A1 WO 2005043636A1 JP 2004016346 W JP2004016346 W JP 2004016346W WO 2005043636 A1 WO2005043636 A1 WO 2005043636A1
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- Prior art keywords
- layer
- light
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- semiconductor layer
- main surface
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- 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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/10—Shapes, relative sizes or dispositions of the regions of the semiconductor bodies; Shapes of the semiconductor bodies
- H10D62/117—Shapes of semiconductor bodies
-
- 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
- H10H20/852—Encapsulations
- H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
-
- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
-
- 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]
- H10H20/01—Manufacture or treatment
- H10H20/011—Manufacture or treatment of bodies, e.g. forming semiconductor layers
- H10H20/018—Bonding of wafers
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- 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
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- 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
- H10H20/852—Encapsulations
- H10H20/853—Encapsulations characterised by their shape
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- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
- H10W72/073—Connecting or disconnecting of die-attach connectors
- H10W72/07351—Connecting or disconnecting of die-attach connectors characterised by changes in properties of the die-attach connectors during connecting
- H10W72/07352—Connecting or disconnecting of die-attach connectors characterised by changes in properties of the die-attach connectors during connecting changes in structures or sizes
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- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
- H10W72/321—Structures or relative sizes of die-attach connectors
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- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
- H10W72/381—Auxiliary members
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- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/50—Bond wires
- H10W72/551—Materials of bond wires
- H10W72/552—Materials of bond wires comprising metals or metalloids, e.g. silver
- H10W72/5522—Materials of bond wires comprising metals or metalloids, e.g. silver comprising gold [Au]
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- 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
- H10W72/00—Interconnections or connectors in packages
- H10W72/851—Dispositions of multiple connectors or interconnections
- H10W72/874—On different surfaces
- H10W72/884—Die-attach connectors and bond wires
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- 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
- H10W74/00—Encapsulations, e.g. protective coatings
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- 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
- H10W90/731—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors
- H10W90/734—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors between a chip and a stacked insulating package substrate, interposer or RDL
-
- 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
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- 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
- H10W90/754—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked insulating package substrate, interposer or RDL
Definitions
- the present invention relates to a light emitting device.
- H11-91641 a light-emitting element in which an element chip is covered with an epoxy resin is widely known.
- the bottom surface of the element chip in order to use the bottom surface of the element chip as a light emitting drive end, the bottom surface is adhered to a metal stage via a conductive adhesive layer such as Ag paste, and the driving terminal force provided on the metal stage is used to drive the element chip to emit light.
- a structure for applying a voltage is often used.
- the element chip adhered on the metal stage is molded together with the conductive adhesive layer.
- An object of the present invention is to provide a light emitting element having a structure in which an element chip adhered to a metal stage is hardly peeled off even when a mold resin expands.
- a first light-emitting element of the first invention has a light-emitting layer portion and a second main surface of an element chip having a main light extraction surface formed on its first main surface.
- the element chip is bonded to the metal stage via the conductive adhesive layer, and the polymer chip material, which has a light-transmitting property to the luminous flux of the light-emitting layer portion, is formed on the metal stage together with the conductive adhesive layer. It has a structure covered with a mold part,
- a cross-section decreasing portion in which a cross-sectional area orthogonal to the thickness direction decreases continuously or stepwise from the first main surface side to the second main surface side in at least a part section in the thickness direction of the element chip. Is formed, and a part of the mold part has a first mold layer covering at least the cross-section reducing part, and a second mold layer covering the outside of the first mold layer, and the first mold layer is formed of a second mold layer. It is characterized by being composed of a polymer mold material that is softer than the mold layer.
- the "light extraction surface” of an element is an element surface from which emitted light can be extracted to the outside
- the “main light extraction surface” is a main compound semiconductor.
- the light extraction surface formed on the first main surface of the layer.
- the side surface of the main compound semiconductor layer or the bottom surface of the cutout formed on the second main surface of the compound semiconductor layer can constitute the light extraction surface.
- the “main compound semiconductor layer” is formed by dividing a laminate of a compound semiconductor including a light emitting layer portion in a thickness direction on a plane including a bottom surface of a cutout portion, and forming a portion including a light emitting layer portion. That! , U.
- An object of the first invention is that, in at least a part of the section in the thickness direction, the cross-sectional area orthogonal to the thickness direction is continuous from the first main surface side to the second main surface side.
- it is a light emitting element chip in which a cross-sectionally decreasing portion that gradually decreases is formed. If the mold material in contact with this reduced section expands due to the temperature rise during light emission driving, the difference in the ambient temperature between day and night in the operating environment, or the effects of direct sunlight in the middle of summer, etc., the chip strength of the element chip will increase. Factors that cause stress in the direction in which the chip is lifted and that cause chipping of the element chip Become.
- the first mold layer that is in contact with the reduced section is made of a resin that is softer than the second mold layer that covers the outside of the first mold layer, expansion occurs. Since it is easily compressed and deformed, the level of generated stress is reduced, and defects such as peeling of the element chip from the conductive adhesive layer can be effectively suppressed.
- the second mold layer can be made of epoxy resin.
- a mold material other than epoxy resin for example, fluorine resin such as polyvinylidene fluoride: harder than silicone resin described later together with epoxy resin
- the second mold layer may have a multi-layer structure of an epoxy resin and a fluorine resin.
- silicone resin can be suitably used as the soft polymer material constituting the first mold layer.
- Silicone resin is generally flexible, has a good effect of absorbing expansion displacement, and has high transparency.
- a liquid uncured composition can be easily obtained, so that a mold layer can be easily formed.
- silicone resin including rubber and elastomer as a concept
- JCR junction coating resin
- the first aspect of the invention can be suitably adopted.
- the second of the light emitting elements of the first invention is that the second main surface of the element chip having the light emitting layer portion and the main light extraction surface formed on the first main surface of itself is a conductive adhesive layer.
- the element chip is bonded to the metal stage through the metal stage, and the polymer chip material having a light transmitting property with respect to the luminous flux from the light emitting layer portion on the metal stage together with the conductive adhesive layer. It has a structure covered with a mold part,
- the cross-sectional area orthogonal to the thickness direction decreases continuously or stepwise from the first main surface side to the second main surface side.
- a cross-section reducing portion is formed, and the mold portion is characterized in that at least a portion covering the cross-section reducing portion is made of a polymer molding material made of silicone resin.
- the portion in contact with the reduced section of the mold portion is made of a silicone resin that is flexible, has a good effect of absorbing expansion displacement, and has high transparency, so that even if expansion occurs, it can be easily formed.
- the third aspect of the light emitting device of the first invention is that the mold layer in contact with the reduced-section portion is viewed from the viewpoint of hardness, and has a light emitting layer portion and a main light on its own first main surface.
- the second main surface of the element chip on which the take-out surface is formed is adhered to a metal stage via a conductive adhesive layer, and the element chip is attached to the metal stage together with the conductive adhesive layer on the metal stage.
- a cross-sectional area orthogonal to the thickness direction is continuous or stepwise from the first main surface side to the second main surface side.
- the molded part is formed of at least a part covering the reduced cross-section, and is a polymer made of a flexible material having a type A durometer hardness of 50 or less specified in JIS: K6253. It is characterized by being composed of a mold material.
- the mold layer in contact with the reduced section has a hardness of 50 or less in the above type A durometer hardness, the effect of absorbing the expansion displacement and, moreover, the effect of preventing the chip from peeling becomes more remarkable, and the chip is electrically conductively bonded. Problems such as peeling from the layer can be effectively suppressed.
- the silicone resin has a hardness equal to or more than an appropriate lower limit (for example, 17 or more in Type A durometer hardness specified in JIS: K6253, desirably 30 or more), the entire molding part may be silicone. It is also possible to use a resin (this is a second subordinate concept of the light emitting device of the first invention).
- urethane-based elastomer rubber
- silicone resin can be used in addition to silicone resin.
- the first configuration of the light emitting device of the first invention that is, the configuration in which the outside of the soft first mold layer is covered with a hard second mold layer such as epoxy resin
- the lower limit of the hardness of the first mold layer may be set further lower, for example, the first mold layer may be composed of a resin having a type A durometer hardness of less than 17.
- a gel-type silicone resin cannot be measured with a type A durometer, and in this case, the hardness is determined by another method.
- the consistency test method specified in JIS: K2220 In the penetration measured using a 1Z4 cone needle at a load of 9.38 g can be used as an index of hardness.
- the above gelled silicone resin those having a penetration of, for example, 50 or more and less than 80 (this numerical value is much lower than the type A durometer hardness of 17) can be employed.
- a softer material is applied to the first mold layer
- the outside of the first mold layer is covered with a hard second mold layer such as an epoxy resin, so that the strength and durability of the mold can be secured. it can.
- the reduced section is covered with a more flexible resin, the effect of absorbing the expansion displacement is further enhanced, and the second mold layer such as the epoxy resin is shrunk at the time of hardening, etc. Even if an undesired gap is formed between the first mold layer and the first mold layer, the first mold layer easily deforms to follow and fill the gap, so that the sealing property of the mold can be improved.
- silicone resins for CFCR which can be used in the first invention include KJR-9010 (penetration: 65) and KJR-9015 (penetration: 65) as gel silicone resins. ), KJR-9016 (Penetration: 70), KJR9017 (Penetration: 65) (Shi-go is also a product name of Shin-Etsu Chemical Co., Ltd.), KJR-9022 (Type A durometer hardness as silicone elastomer) : 17), KJR-9023 (Type A durometer hardness: 22), KJR-9025 (Type A durometer hardness: 42), KJR —9030 and X—35—233—2 (V, deviation is also Shin-Etsu Chemical Co., Ltd.) Product name). All are materials with a Type A durometer hardness of 50 or less.
- the protruding surface of the Ag paste layer is a paste.
- the paste reflecting surface is preferably covered with a polymer molding material made of silicone resin. Silicone resin has better moisture barrier properties than epoxy resin, etc., and can reach and reflect moisture penetrating the paste reflective surface compared to the conventional structure in which the paste reflective surface is covered with an epoxy resin mold. As a result, deterioration of the paste reflecting surface due to oxidation can be suppressed, and the reflectance can be kept good for a long period of time.
- the device chip includes a main compound semiconductor layer having a light-emitting layer portion and a main light extraction surface formed on a first main surface side thereof, and the main compound semiconductor.
- a conductive base semiconductor layer located on the second main surface side of the layer.
- the second main surface of the layer is adhered to the metal stage via the conductive adhesive layer, at least a part of the portion directly below the main light extraction surface becomes a notch target portion, and a residual partial force generated as a result of the notch
- a cutout portion is formed in the base semiconductor layer so as to include at least a part of a portion directly below the light extraction side electrode, and at least a bottom surface of the cutout portion can constitute a reduced cross section portion.
- the base semiconductor layer is cut off at a portion of the second main surface of the main compound semiconductor layer, which is a region directly below the main light extraction surface, so that light emission is directed toward the portion.
- the light beam can be extracted more efficiently, and the light extraction efficiency can be greatly increased.
- the cutout portion is filled with the soft polymer molding material as described above, even if the filled polymer molding material expands temporarily, the generated stress level can be small, It is possible to effectively suppress such a problem that the element chip is lifted off the conductive adhesive layer and peeled off.
- the base semiconductor layer has a continuous or stepwise cross-sectional area orthogonal to the thickness direction toward at least the intermediate position in the thickness direction toward the second main surface bonded to the metal stage. It can be formed as an increased cross-section increasing portion.
- the expansion stress when the polymer mold material inside the notch expands increases the conductivity of the base semiconductor layer in the cross-section increasing portion. It acts in the direction of pressing against the adhesive layer, and it is possible to more effectively suppress problems such as floating of the element chip from the conductive adhesive layer and peeling off.
- the side surface of the base semiconductor layer is formed in a concave curved cross-sectional shape in the cutout portion, and is located closer to the second main surface side than the curved bottom position of the side surface of the base semiconductor layer in the thickness direction. It is possible to adopt a configuration in which a portion forms a cross-section increasing portion.
- the side surface of the base semiconductor layer is formed into a concave curved cross section as described above, the expansion stress of the mold material filled in the cutout can be dispersed in various directions along the curved surface, and the chip of the element is peeled. And so on.
- morphologically there is also an advantage that it can be obtained relatively easily by using a dicing groove for separating the wafer into element chips and etching the side surface of the base semiconductor layer by etching. .
- the outwardly projecting flange-shaped protruding portion may be formed so as to form at least a part of the cross-section increasing portion.
- a flange-shaped protruding portion By forming such a flange-shaped protruding portion, it is possible to enlarge the cross-sectionally increased portion in area, and the base semiconductor layer is electrically conductive adhesive layer when subjected to expansion stress as much as molding material force.
- the effect of pressing against the chip is further enhanced, and peeling of the element chip and the like can further occur.
- the formation of the flange-shaped protruding portion also increases the bonding area to the metal stage, thereby increasing the bonding strength.
- the light emitting device of the first invention can be configured as follows. That is, the main conjugate compound semiconductor layer is epitaxially grown on the first main surface of the light-absorbing compound semiconductor substrate, and a partial region of the first main surface of the main conjugate compound semiconductor layer is exposed to the main light extraction surface.
- the light extraction side electrode for applying a light emission drive voltage to the light emitting layer portion is formed so as to cover a part of the first main surface of the semiconductor layer. Then, at least a part of the portion directly below the main light extraction surface becomes a notch target portion, and the residual substrate portion resulting from the notch includes at least a part of the portion directly below the light extraction side electrode.
- a cutout portion is formed in the semiconductor substrate of the absorbent composite, and the remaining substrate portion forms a base semiconductor layer.
- the light-emitting layer is made of, for example, AlGalnP
- a GaAs substrate can be used as the light-absorbing conjugate semiconductor substrate (and thus the remaining substrate) used for the epitaxial growth.
- the light-absorbing conjugate semiconductor substrate used for the epitaxial growth of the light-emitting layer portion (including the main conjugate compound semiconductor layer) is provided after the growth of the luminescent layer portion. At least a part of the part immediately below the main light extraction surface, which is to be removed, becomes a notch target part, and at least a part of the part immediately below the light extraction side electrode is formed in a residual substrate part resulting from the notch. Cut out to be included.
- the compound semiconductor substrate for growth acting as a light absorbing portion is notched in a portion of the second main surface of the main compound semiconductor layer, which is a region directly below the main light extraction surface, so that a force is applied to the portion.
- the emitted light beam can also be extracted to the outside, and the light extraction efficiency can be greatly increased.
- a part of the substrate is left as a residual substrate in a region directly below the light extraction side electrode. Even if reflected light is generated in the region immediately below the light extraction side electrode, the residual substrate part is eventually blocked by the light extraction side electrode even if reflected light is generated, so a part of the substrate should be left in this part Harm caused by Is less. Then, by leaving a part of the light-absorbing compound semiconductor substrate as a residual substrate portion in the region, the effect of light absorption by the residual substrate portion is not so remarkable that the rigidity of the light-emitting layer portion can be increased. Functions can be assigned.
- the notch is formed along the peripheral edge so as to surround the portion directly below the light extraction side electrode, the emitted light flux extracted using the notch is further increased. be able to. Further, if an auxiliary current diffusion layer made of a compound semiconductor is provided between the residual substrate portion and the light emitting layer portion, the luminous flux extracted from the bottom surface of the cutout portion can be further increased.
- the thickness is sufficiently small (for example, 20 nm or less), the difference can be obtained even if a part of the light-absorbing conjugate semiconductor substrate remains at the bottom of the notch. I do not support it.
- the light-absorbing compound semiconductor derived from the substrate should not remain at the bottom of the notch as much as possible. It is preferable that the second main surface of the main semiconductor layer (having smaller light absorption than the substrate) is formed through the target semiconductor substrate in the thickness direction and is exposed to the cutout portion.
- the above-mentioned notch formed in the element chip absorbs a metal paste which tends to crawl on the side surface of the semiconductor layer when the base semiconductor layer is bonded by the conductive adhesive layer. Can be used as space. Thereby, it is possible to effectively prevent such a problem that the pn junction of the light emitting layer portion included in the main compound semiconductor layer is short-circuited by the crawled metal paste. In this case, if the thickness of the residual substrate portion is secured to 40 m or more, the above effect can be further remarkable.
- At least a part of the section from the first main surface to the second main surface in the thickness direction can be an inclined surface having a continuously reduced cross-sectional area.
- the side surface area of the element chip can be increased, and the light extraction efficiency can be improved.
- the inclined surface is covered with a reflective metal layer, the light emitted from the light emitting layer can be reflected to the main light extraction surface side, and the directivity of the emitted light toward this side can be increased.
- the inclined surface becomes the above-described cross-section reducing portion, if the first mold layer is formed so as to cover the inclined surface, peeling of the element chip from the conductive adhesive layer can be effectively suppressed. it can.
- the second mold layer is made of a material having a lower refractive index than the compound semiconductor forming the main compound semiconductor layer having a higher refractive index than the first mold layer, in any of the above configurations, The light extraction efficiency at the main light extraction surface can be further increased by arranging the main light extraction surface of the semiconductor layer in direct contact with the main light extraction surface.
- the light-emitting device of the second invention has a main compound semiconductor layer having a light-emitting layer portion and a main light extraction surface formed on the first main surface side of the light-emitting element, and a second main surface side of the main compound semiconductor layer.
- the second main surface of the base semiconductor layer of the element chip having the light-absorbing base semiconductor layer is adhered to the metal stage via the conductive adhesive layer, and the element chip is placed on the metal stage together with the conductive adhesive layer.
- the light-emitting layer has a structure in which it is covered with a mold part having a polymer molding material having a light-transmitting property with respect to the luminous flux of the light emitted from the light-emitting layer.
- a notch portion is formed in the base semiconductor layer so as to be a notch target portion and to include at least a part of a portion immediately below the light extraction side electrode, which is a residual partial force resulting from the notch;
- the second main surface of the base semiconductor layer in which the cutout is formed is adhered to the metal stage via a conductive adhesive layer, and in this state, the element chip is mounted on the metal stage, and the cutout is made of a polymer molding material.
- the base semiconductor layer is bonded to the metal stage at least in the middle of the thickness direction in the thickness direction, and is orthogonal to the thickness direction toward the second main surface side. A cross-sectional increase portion in which the cross-sectional area increases is formed.
- the second main surface of the light-absorbing base semiconductor layer is adhered to the metal stage via the conductive adhesive layer, and the element chip is bonded to the metal stage together with the conductive adhesive layer. Cover with a mold part on top.
- the base semiconductor layer is cut out in a portion of the second main surface of the main compound semiconductor layer, which is a region directly below the main light extraction surface, so that the luminous flux directed to the portion is more efficiently cut off from the notch.
- the light can be extracted, and the light extraction efficiency can be greatly increased.
- the notch is filled with a polymer molding material.
- the polymer molding material filling the inside of the notch is filled. Expansion when expanded Since the force acts in such a direction as to press the base semiconductor layer against the conductive adhesive layer in the cross section increasing portion, it is possible to effectively suppress such a problem that the element chip is lifted off and peeled off from the conductive adhesive layer.
- the cross-section increasing portion may have a cross-sectional area orthogonal to the thickness direction that continuously increases or may increase gradually.
- At least a part of the mold section can be made of epoxy resin. Since epoxy resin has a relatively large refractive index, the effect of improving light extraction efficiency is particularly remarkable, and the 1S thermal expansion coefficient is also high.
- the second invention even when an epoxy resin having a high coefficient of thermal expansion is used as a molding material, it is possible to effectively suppress a problem such as peeling of an element chip and to enjoy a light extraction improving effect without any problem. become. The effect is particularly remarkable when adopting a configuration in which the notch is filled with epoxy resin.
- the entire mold portion may be made of epoxy resin, or only a part may be made of epoxy resin.
- the side surface of the base semiconductor layer is formed in a concave curved cross-sectional shape in the cutout portion, and the second side of the side surface of the base semiconductor layer in the thickness direction is more than the curved bottom position. It is possible to adopt a configuration in which the portion located on the main surface side forms the cross-section increasing portion.
- the side surface of the base semiconductor layer is formed into a concave curved cross section as described above, the expansion stress of the mold material filled in the cutout can be dispersed in various directions along the curved surface, and the chipping of the element chip can be prevented. It can happen more. Further, morphologically, it can be obtained relatively easily by using a dicing groove for separating the wafer into element chips and etching the side surface of the base semiconductor layer by etching. is there.
- an outwardly projecting flange-shaped protruding portion is formed at an end position on the second main surface side in the thickness direction so as to form at least a part of the cross-section increasing portion.
- the light emitting device of the second invention can be configured as follows. That is, the main semiconductor layer is epitaxially grown on the first main surface of the light-absorbing compound semiconductor substrate, and a part of the first main surface of the main semiconductor layer is exposed to the main light extraction surface.
- a light extraction side electrode for applying a light emission drive voltage to the light emitting layer portion is formed so as to cover a part of the first main surface of the main compound semiconductor layer.
- at least a part of a portion directly below the main light extraction surface is a notch target portion, and at least a part of a portion directly below the light extraction side electrode is included in a residual substrate portion generated as a result of the notch.
- a notch is formed in the semiconductor substrate of the light-absorbing compound, and the remaining substrate forms a base semiconductor layer.
- the light emitting layer portion is made of, for example, AlGalnP
- a GaAs substrate can be used as the light-absorbing conjugate semiconductor substrate (and thus the remaining substrate portion) used for the epitaxial growth.
- the light-absorbing conjugate semiconductor substrate used for the epitaxial growth of the light-emitting layer portion (including the main conjugate semiconductor layer) is formed after the growth of the light-emitting layer portion. At least a part of the part immediately below the main light extraction surface, which is to be removed, becomes a notch target part, and at least a part of the part immediately below the light extraction side electrode is formed in a residual substrate part resulting from the notch. Cut out to be included.
- the compound semiconductor substrate for growth acting as a light absorbing portion is notched in a portion of the second main surface of the main compound semiconductor layer, which is a region directly below the main light extraction surface, so that a force is applied to the portion.
- the emitted light beam can also be extracted to the outside, and the light extraction efficiency can be greatly increased.
- a part of the substrate is left as a residual substrate in a region directly below the light extraction side electrode. Even if reflected light is generated in the region immediately below the light extraction side electrode, the residual substrate part is eventually blocked by the light extraction side electrode even if reflected light is generated, so a part of the substrate should be left in this part The actual harm caused by this is small. Then, by leaving a part of the light-absorbing compound semiconductor substrate as a residual substrate portion in the region, the effect of light absorption by the residual substrate portion is not so remarkable that the rigidity of the light-emitting layer portion can be increased. Functions can be assigned.
- the notch is formed along the peripheral edge so as to surround the portion immediately below the light extraction side electrode, the luminous flux extracted using the notch can be further increased. Can be made. Further, if an auxiliary current diffusion layer made of a compound semiconductor is provided between the residual substrate portion and the light emitting layer portion, the luminous flux extracted from the bottom surface of the cutout portion can be further increased.
- the thickness is sufficiently small (for example, 20 nm or less), the difference can be obtained even if a part of the light-absorbing conjugate semiconductor substrate remains at the bottom of the notch. I do not support it.
- the light-absorbing compound semiconductor derived from the substrate should not remain at the bottom of the notch as much as possible. It is preferable that the second main surface of the main semiconductor layer (having smaller light absorption than the substrate) is formed through the target semiconductor substrate in the thickness direction and is exposed to the cutout portion.
- the above-mentioned notch formed in the element chip absorbs a metal paste that tends to crawl on the side surface of the semiconductor layer when the base semiconductor layer is bonded by the conductive adhesive layer. Can be used as space. Thereby, it is possible to effectively prevent such a problem that the pn junction of the light emitting layer portion included in the main compound semiconductor layer is short-circuited by the crawled metal paste. In this case, if the thickness of the residual substrate portion is secured to 40 m or more, the above effect can be further remarkable.
- FIG. 1 is a schematic cross-sectional view showing one example of the light emitting device of the first invention.
- FIG. 2 is a schematic cross-sectional view showing, on an enlarged scale, an element chip of FIG. 1.
- FIG. 3 is a process explanatory view showing an example of a method for manufacturing the light emitting device of FIG. 1.
- FIG. 4 is an explanatory view of the process following FIG. 3.
- FIG. 5 is an explanatory view of another step of forming a cutout portion having a concavely curved cross section.
- FIG. 6 is a schematic sectional view showing a first modification of the light emitting device of FIG. 1.
- FIG. 7 is a process explanatory view showing one example of a method for manufacturing the light emitting device of FIG. 5.
- FIG. 8 is an explanatory view showing a modification of the manufacturing process of the residual substrate portion.
- FIG. 9 is a schematic cross-sectional view showing a second modification of the light emitting device of FIG. 1.
- FIG. 10 is a schematic cross-sectional view showing a third modification of the light emitting device of FIG. 1.
- FIG. 11 is a schematic cross-sectional view showing a fourth modification of the light emitting device of FIG. 1.
- FIG. 12 is a schematic cross-sectional view showing a fifth modification of the light emitting device of FIG. 1.
- FIG. 13 is a schematic cross-sectional view showing one example of the light emitting device of the second invention.
- FIG. 14 is an explanatory view showing a state in which an element chip is peeled off due to expansion of a mold portion.
- the main semiconductor layer 40 having the light-emitting layer portion 24 has an epitaxy on the first main surface of the light-absorbing semiconductor substrate (see FIG. 3; reference numeral 10). It has a grown element chip 100C.
- FIG. 2 is an enlarged view of the element chip 100C.
- the main light extraction surface EA is formed on the first main surface side of the main compound semiconductor layer 40, and a light emission driving voltage is applied to the light emitting layer portion 24.
- the light extraction side electrode 9 is formed so as to cover a part of the first main surface of the semiconductor layer 40 (specifically, the remaining area of the main light extraction surface EA).
- the light-absorbing conjugate semiconductor substrate 10 shown in FIG. 3 has a notch lj formed by cutting the peripheral edge thereof except for a portion immediately below the light extraction electrode 9 in FIG. 1, and the notch lj is formed.
- the portion of the substrate left on the periphery of the substrate is a residual substrate portion (base semiconductor layer) 1.
- the transparent thick film semiconductor layer 20, the connection layer 7, the light emitting layer part 24, and the auxiliary current spreading layer 91 belong to the main semiconductor layer 40
- the buffer layer 2 and the remaining substrate part 1 belong to the main semiconductor layer 40.
- Compound Does not belong to semiconductor layer 40.
- the light emitting layer portion 24 is made of a non-doped (AlGa) InP (0 ⁇ x ⁇ 0.55, 0.45 ⁇ y ⁇ 0.55) mixture.
- the active layer 5 composed of a crystalline force is composed of a p-type (AlGa) InP (where x ⁇ z ⁇ 1) force, a p-type cladding layer 6 which also has a force, and an n-type (AlGa) InP (where x ⁇ 1)
- the structure has a structure sandwiched between the active n-type cladding layer 4 and the emission wavelength in the range from green to red depending on the composition of the active layer 5 (emission wavelength (peak emission wavelength) is 550 nm or more and 670 ⁇ m or less ) Can be adjusted.
- the p-type cladding layer 6 is disposed on the light extraction side electrode 9 side, and the n-type cladding layer 4 is disposed on the remaining substrate portion 1 side. Accordingly, the current-carrying polarity of the light extraction side electrode 9 is positive.
- the term “non-doped” as used herein means “do not actively add a dopant”, and includes a dopant component that is inevitably mixed in a normal manufacturing process (for example, 10 13 — 10 16 / up to about 3 cm) Is not excluded.
- the remaining substrate 1 is made of GaAs single crystal.
- a transparent thick film semiconductor layer 20 made of GaP (some may be GaAsP or AlGaAs) is formed on the first main surface of the light emitting layer section 24.
- the light extraction side electrode 9 (for example, an Au electrode) is formed substantially at the center of the first main surface of the transparent thick film semiconductor layer 20.
- a region around the light extraction side electrode 9 on the first main surface of the transparent thick semiconductor layer 20 forms a main light extraction surface EA.
- the surface thickness of the transparent thick film semiconductor layer 20 on the light extraction side electrode 9 side is reduced.
- the high-concentration doping layer 20h has a higher dopant concentration than the remaining portion.
- the transparent thick semiconductor layer 20 is formed as a thick film having a thickness of, for example, 10 ⁇ m or more and 200 ⁇ m or less (preferably 40 ⁇ m or more and 200 ⁇ m or less), thereby increasing the luminous flux extracted from the layer side surface 20S. It also plays a role in increasing the luminance of the entire light emitting element (integrating sphere luminance). Further, by forming the transparent thick film semiconductor layer 20 from a group III-V compound semiconductor having a band gap energy larger than the photon energy corresponding to the peak wavelength of the luminous flux from the luminescent layer section 24, the luminous flux is increased. Is also suppressed. Note that, between the light extraction side electrode 9 and the transparent thick film semiconductor layer 20, a bonding alloying layer 9a for reducing the contact resistance between them is formed using, for example, an AuBe alloy or the like.
- a notch lj is formed penetrating the remaining substrate portion 1 in the thickness direction, and the second main surface of the main compound semiconductor layer 40, here, the auxiliary current diffusion A part of the second main surface of the layer 91 is exposed in the cutout lj (this exposed surface forms the bottom surface of the cutout lj).
- the light-absorbing compound semiconductor substrate and thus the residual substrate portion 1 have n-type.
- the luminous flux from the light emitting layer section 24 can be taken out also from the notch lj.
- the second main surface of the residual substrate portion 1 is adhered on a metal stage 52 also serving as a reflection member, and the luminous flux extracted from the notch lj is reflected by the reflection surface RP of the metal stage 52.
- a bonding alloyed layer 16 serving as a back electrode portion is formed on the entire surface.
- the bonding metallization layer 16 contains Au or Ag as a main component (50% by mass or more), and After forming a film on the surface of the semiconductor, a metal for external use containing an appropriate amount of an alloy component for obtaining ohmic contact according to the type and conductivity type of the semiconductor to be subjected to alloying heat treatment (so-called sintering) It is formed by this.
- the bonding alloying layer 16 is formed using an AuGeNi alloy (for example, Ge: 15% by mass, Ni: 10% by mass, and the balance Au).
- the remaining substrate portion 1 in the bonding alloyed layer 16 is formed by a metal paste layer.
- the metal paste layer 117 is formed by applying a metal paste in which a metal powder such as Ag is dispersed in a binding resin and a vehicle serving as a solvent, and then drying the applied metal paste.
- the light extraction side electrode 9 is electrically connected to the conductor metal fitting 51 via a bonding wire 9w formed of an Au wire or the like.
- the conductor fitting 51 extends through the metal stage 52 to the rear surface side to form a first energizing terminal 5 la.
- a second conducting terminal 52a is formed so as to protrude.
- An insulating ring 51i made of resin is disposed between the conductor fitting 51 and the metal stage 52.
- a light emission driving voltage is applied to the light emitting layer section 24 via the first energizing terminal 51a and the second energizing terminal 52a.
- the element chip 100 C is covered with a metal paste layer 117 and a mold part 25 having a polymer molding material having a light transmitting property with respect to the luminous flux of the light emitting layer part 24.
- the mold part 25 is formed in such a manner that the notch part lj of the element chip 100C is filled with a polymer molding material. From the first main surface side to the second main surface side of the element chip 100C, the cross-sectional area of the chip orthogonal to the thickness direction is equal to the bottom surface of the notch lj (the second main surface of the main bonded semiconductor layer 40). (The exposed surface of the main surface). That is, the bottom surface of the notch lj forms a cross-section reduction part.
- the first mold made of a silicone resin for JCR (for example, KJR-9010 as the above-mentioned gel silicone resin) is filled with the notch lj.
- a layer 26 is formed, and a second mold layer 25m made of epoxy resin is formed so as to cover the first mold layer 26!
- the first mold layer 26 is from the second mold layer 25m Is also soft.
- the second mold layer 25m having a large refractive index is arranged in direct contact with the side surface of the main compound semiconductor layer 40 and the first main surface forming the main light extraction surface, and the side surface of the main compound semiconductor layer and the main light extraction surface The efficiency of light extraction from the light is increased.
- the residual substrate portion 1 has a cross-sectional area orthogonal to the thickness direction continuously from a middle position in the thickness direction toward the second main surface side to be attached to the metal stage 52.
- An increasing cross section lg is formed. More specifically, the side surface of the residual substrate portion 1 is formed in a concave curved cross-sectional shape at the notch lj, and is located closer to the second main surface than the curved bottom position of the side surface of the residual substrate portion 1 in the thickness direction. The located portion forms the cross-section increasing portion lg.
- the portion of the side surface of the residual substrate portion 1 located closer to the first main surface than the curved bottom position forms a cross-sectionally reduced portion, and this portion, together with the bottom surface of the notch lj, is a soft first mold. Covered by layer 26!
- an auxiliary current diffusion layer 91 made of a compound semiconductor such as AlGaInP, AlGaAs, AlInP, or InGaP is formed between the residual substrate section 1 and the light emitting layer section 24.
- the thickness of the auxiliary current diffusion layer 91 is, for example, 0.5 ⁇ m or more and 30 ⁇ m or less (preferably 1 ⁇ m or more and 15 ⁇ m or less).
- the effective carrier concentration (therefore, the n-type dopant concentration) is higher than that of the n-type cladding layer 4), and the in-plane current diffusion effect is enhanced.
- the thickness of the n-type cladding layer 4 can be made larger than the thickness of the p-type cladding layer 6 so that the surface layer on the second main surface side of the n-type cladding layer 4 can function as an auxiliary current diffusion layer. It is.
- the bottom surface force of the notch lj reflects the extracted luminous flux on the reflecting surface RP of the metal stage 52, and the reflected light RB causes the first main beam of the luminescent layer section 24 to be reflected.
- the luminous flux to the surface side can be greatly increased.
- the auxiliary current diffusion layer 91 provided between the remaining substrate portion 1 and the light emitting layer portion 24 enhances the effect of current diffusion to the bottom portion of the notch portion lj, and increases the current diffusion effect of the notch portion lj of the light emitting layer portion 24. Increase the distribution current to the region corresponding to. This makes it possible to further increase the luminous flux extracted from the bottom surface of the notch lj.
- the outer peripheral surface of the residual substrate portion 1 has a simple cut surface, and the entire mold portion 25 is made of a hard epoxy resin. And the notch When the epoxy resin filled in the notched portion lj expands due to heat generation and the like of the element chip 100C, the bottom of the notched portion lj (in the figure, the exposed outer peripheral surface of the auxiliary current diffusion layer 91) and the metal stage 51 are removed. Between the upper surface and the upper surface of the substrate.
- the element chip 100C is lifted up in a form that the element chip 100C is jacked up by the above-described tension force, and the adhesive layer is removed. A problem occurs that the metal paste layer 117 is peeled off.
- the force filled in the notch lj is a soft silicone resin (polymer molding material) constituting the first mold layer 26, Even if expansion occurs, it is easily compressed and deformed, so that the generated stress level is small.
- the cross-section increasing portion lg is provided on the second main surface side of the residual substrate portion 1, when the silicone resin filled in the notch lj expands, the expansion stress is increased in the cross-section increasing portion lg. It acts in the direction of pressing the remaining substrate portion 1 and thus the device chip 100C against the metal paste layer 117 (conductive adhesive layer). As a result, problems such as the device chip 100C rising from the metal paste layer 117 and peeling off can be effectively suppressed.
- the side surface of the residual substrate portion 1 has a concave curved cross-sectional shape, and the expansion stress of the silicone resin filled in the notch lj can be dispersed in various directions along the curved surface, and the device chip 100C Peeling etc. can occur even more.
- the first mold layer 26 is made of a resin having a type A durometer hardness of less than 17, specifically, a gel silicone resin, the effect of absorbing the expansion displacement is further enhanced.
- the second mold layer 25m made of epoxy resin (polymer molding material) shrinks during curing, etc., an undesired gap is created between it and the first mold layer 26. 26 can easily follow and deform to fill the gap, so that the tightness of the mold part 25 can be improved.
- the metal paste layer 117 is formed as an Ag paste layer so as to protrude around the second main surface of the device chip 100C, and the protruding surface of the Ag paste layer reflects the paste reflection.
- the surface RP is formed.
- the first mold layer 26 made of silicone resin is formed so as to cover the paste reflection surface RP. Silicone resin has better moisture barrier properties than epoxy resin, etc., which forms the second mold layer 25m, so that oxidation deterioration due to the penetration of moisture into the paste reflection surface RP 'is suppressed, and the reflectance is prolonged. It can be kept good for a long time.
- a growth substrate 10 made of an n-type GaAs single crystal is prepared.
- the GaAs buffer layer 2 is grown on the first main surface of the growth substrate 10, and the auxiliary current diffusion layer 91 is further grown.
- the n-type cladding layer 4, the active layer (non-doped) 5, and the p-type cladding layer 6 are formed in this order by the well-known MOVPE (Metabolic Organic Vapor Phase Epitaxy) method as the light emitting layer portion 24. Growing it up in a pitch.
- MOVPE Metalabolic Organic Vapor Phase Epitaxy
- the transparent thick semiconductor layer 20 (thickness: 10 ⁇ m or more and 200 ⁇ m or less (for example, 100 m)) is formed by, for example, a hydride vapor phase epitaxy method (HVPE) or Epitaxial growth using MOVPE method.
- HVPE hydride vapor phase epitaxy method
- MOVPE method Metal Organic Chemical Vapor deposition
- the transparent thick film semiconductor layer 20 made of GaP, GaAsP or AlGaAs has an advantage that a high-quality transparent semiconductor layer 20 is grown at a high speed by the HVPE method and hydrogen and carbon are less likely to remain immediately.
- the transparent thick semiconductor layer 20 may be formed by bonding a substrate made of GaP, GaAsP or AlGaAs to the light emitting layer section 24.
- a bonding layer 7 made of AlInP, GalnP or AlGaAs is formed following the light emitting layer section 24, and a substrate made of GaP, GaAsP or AlGaAs is bonded to this bonding layer 7.
- the bonding can be performed more reliably.
- the bonding layer 7 is not particularly required.
- step 4 a process for reducing the thickness of the growth substrate 10 is performed.
- the second main surface side portion 1 "of the growth substrate 10 is removed by grinding, and the remaining substrate portion is used as the substrate main body portion 1 '.
- An element A wafer W is obtained in which the substrate main body 1 ′ is formed on the second main surface.
- a metal material layer for forming a bonding alloyed layer is formed on the second main surface of the substrate main body 1 ′ of the element wafer W by vapor deposition or the like, By performing the alloying heat treatment in a temperature range of 350 ° C. or more and 500 ° C. or less, the bonding alloyed layer 16 is formed. Also, a bonding alloying layer 9a is formed on the first main surface of the transparent thick film semiconductor layer 20 in the same manner (the bonding alloying layer 16 and the alloying heat treatment can also be used). The bonding alloyed layer 9a is covered with the light extraction side electrode 9 by evaporating Au or the like as shown in FIG.
- a flexible elastic material such as EVA (Ethylene Vinvlacetate Copolymer) resin is applied to the second main surface of the substrate body 1.
- EVA Ethylene Vinvlacetate Copolymer
- a break auxiliary support sheet 50 that also has material strength is attached, and as shown in step 6, dicing grooves DG for separating the element wafer W into individual light emitting element chips are formed from the first main surface side of the wafer. It is formed using a known dicer. At this time, the dicing groove DG may be formed so as to slightly bite into the auxiliary support sheet 50 as long as the auxiliary support sheet 50 is not divided.
- the device A wafer W after dicing is immersed in an etching solution ET having a selective etching property with respect to GaAs (for example, a mixed solution of ammonia and hydrogen peroxide).
- the etching solution ET penetrates into the dicing groove DG and erodes the GaAs substrate main body 1 ′ and the GaAs buffer layer 2 exposed from the groove bottom side.
- the erosion of the substrate body 1 ′ and the buffer layer 2 is caused by the main conjugate semiconductor layer 40 having a low corrosion rate with respect to the etching solution (the layer in contact with the GaAs buffer layer 2 is an auxiliary current diffusion layer 91 having a force such as AlGalnP).
- the erosion is more likely to proceed as the distance from the interface increases.
- the etchant ET power is supplied to the side surface of the substrate body 1 ′ through the narrow dicing groove DG, the exchange of the etchant becomes difficult to progress toward the bottom of the groove, so the etching speed is reduced from the middle to the bottom of the groove. Slows down.
- the formation of the bonding alloyed layer 16 which is hardly corroded at the groove bottom position is also a factor of reducing the etching rate on the groove bottom side. In this way, the side surfaces of the substrate main body 1 ′ and the buffer layer 2 are eroded into a concave curved cross section.
- the etching rate is a force that can be adjusted by the width of the dicing groove DG.In this case, the groove width immediately after formation by the dicer can be expanded by pulling and deforming the auxiliary support sheet 50 in the in-plane direction. Thus, the loss of e-wafer can be reduced.
- a half dicing groove HDG penetrating through the bonding alloyed layer 16 (electrode portion) and the substrate body 1 ′ was formed from the second main surface side of the device wafer W,
- a notch lj having a concave curved cross-sectional side surface can be formed.
- a full dicing groove FDG is formed in the remaining main compound semiconductor layer 40 by extending the half dicing groove HDG, and the element chip is formed.
- the separated light emitting element chip 100C has the second main surface side of the remaining substrate portion 1 adhered to the metal stage 52 by the metal paste layer 117, and further around the chip base end on the adhered side. Then, a silicone resin forming the first mold layer 26 is applied to fill the notch lj. After that, the light extraction side electrode 9 is connected to the conductor fitting 51 by a bonding wire 9w, and further, a second mold layer 25m made of epoxy resin is formed, whereby the light emitting element 100 is completed.
- the side surface of the residual substrate portion 1 has a flange-shaped protruding portion protruding outward at the end position on the second main surface side in the thickness direction. If can be formed so as to form a part of the cross-section increase portion lg. By forming such a protruding portion If, the cross-sectionally increased portion lg can be enlarged in area at the end of the second main surface, which is the bonding side, and the chip 100C is more likely to be peeled off. can do.
- the side surface of the main body portion excluding the protruding portion If of the residual substrate portion 1 has a concave curved cross-sectional shape, and the end portion of the main body portion In also forms a cross-section increasing portion lg together with the protruding portion If. .
- the cross-sectional area of the residual substrate portion 1 increases stepwise.
- step 5 is exactly the same as step 5 in FIG. 4.At the time of forming the dicing groove DG in step 6, a part of the substrate main body 1 ′ is left at the bottom of the groove. Perform the same etching. At the time of this etching, the etching is terminated so that the substrate residual layer lm remains at a certain depth at the groove bottom position, and is separated into element chips 100C by breaking with the substrate residual layer lm. As a result, the substrate residual layer lm forms the protruding portion If.
- step 1—step 4 in FIG. 3 may be replaced by step 1—step 4 in FIG.
- a buffer layer 2 made of Ga As is epitaxially grown on the first main surface of a main substrate 10 m made of n-type GaAs single crystal, and then a compound semiconductor layer for separation is formed.
- the etch stop layer 10k (for example, made of AllnP) is epitaxially grown, and the sub-substrate portion 10e made of n-type GaAs single crystal is epitaxially grown on the etch stop layer 10k to grow the light emitting layer portion 24.
- Sub substrate 10e is M It grows by OVPE method or HVPE method.
- Steps 2 and 3 on the first main surface of the sub-substrate portion 10e of the composite growth substrate 10, the light-emitting layer portion 24 and the transparent thick film semiconductor layer 20 where no buffer layer is formed are formed. Grow epitaxially in the same manner as in FIG.
- step 4 a process for reducing the thickness of the composite growth substrate 10 is performed. More specifically, the etching is performed by etching and removing the main substrate 10m and the GaAs buffer layer 2 using a first etching solution (for example, a mixed solution of ammonia and hydrogen peroxide) having a selective etching property for GaAs. Thereafter, the etch stop layer 10k is removed by etching using a second etching solution having a selective etching property with respect to AllnP (for example, hydrochloric acid: hydrofluoric acid may be added to remove the A1 oxide layer!). I do.
- a first etching solution for example, a mixed solution of ammonia and hydrogen peroxide
- a release layer made of a color such as AlAs is formed instead of the etch stop layer 10k, and the release layer is selectively etched by immersing it in an etching solution composed of, for example, a 10% hydrofluoric acid aqueous solution. Accordingly, a step of peeling off the main substrate portion 10m may be adopted.
- the remaining sub-substrate portion 10e can be used in the same manner as the formation of the remaining substrate portion 1, assuming that it corresponds to the substrate main body portion 1 'in FIG.
- the first mold layer 26 can be more easily formed by applying silicone resin or the like.
- the refractive index of the silicone resin is smaller than that of the epoxy resin forming the second mold layer 25m, the thickness of the first mold layer 26 covering the main light extraction surface and the side surface of the main compound semiconductor layer 40 is reduced. It is desirable to make it as small as possible from the viewpoint of improving the light extraction efficiency.
- the side surface of the residual substrate portion 1 is formed into a cut-out surface shape as in the light emitting element 300 in FIG. May be.
- a silicone resin having an appropriate hardness for example, a type A durometer hardness of 17 or more: desirably 30 or more specified in JIS: K6253
- KJR- 9022, KJR-9023, KJR-9025, etc . If the material has the same hardness, a transparent soft urethane resin may be used. Also, the effect of preventing the element chip 100C from peeling can be achieved.
- the side surface of the element chip 100C is at least partly sectioned from the first main surface to the second main surface in the thickness direction (all sections in this embodiment). ) May be an inclined surface having a continuously decreasing cross-sectional area.
- the side surface on the inclined surface is covered with a reflective metal layer 100R made of a gold or the like via an insulating layer 1001 made of a high molecular material or a ceramic material. Note that a portion corresponding to the residual substrate portion 1 in FIG. 1 is not formed.
- the conductive adhesive layer is an Au brazing layer 217 instead of the metal paste layer.
- the inclined surface constitutes a reduced section, and the entire surface is covered with the soft first mold layer 26, and peeling from the Au brazing layer 217 due to the expansion stress of the molding material is suppressed.
- the main light extraction surface of the element chip 100C is covered with the second mold layer 25m.
- the light emitting element 600 in FIG. 13 has an element chip 100C (see FIG. 2) having the same structure as the light emitting element 100 in FIG. 1 (the manufacturing method is also the same as that described with reference to FIGS. 3 to 5). Is the same).
- the element chip 100C together with the metal paste layer 117, is a polymer mold material having a light-transmitting property with respect to the luminous flux from the light-emitting layer part 24, here, a single mold made of epoxy resin. It is covered with a mold part 25 composed of a layer 226.
- the mold part 25 is formed in such a manner that the notch lj of the element chip 100C is filled with epoxy resin.
- the entire mold portion 25 is made of epoxy resin, and as a result, the cutout lj is also filled with epoxy resin.
- the residual substrate portion (base semiconductor layer) 1 has a cross-sectional area orthogonal to the thickness direction from an intermediate position in the thickness direction toward the second main surface side adhered to the metal stage 52.
- a continuously increasing cross section lg is formed. More specifically, the side surface of the residual substrate portion 1 is formed in a concave curved cross-sectional shape at the notch lj, and the second main surface side of the side surface of the residual substrate portion 1 in the thickness direction with respect to the curved bottom position. Is formed as a cross-section increasing portion lg.
- the side surface of the residual substrate portion 1 has a concave curved cross-sectional shape, and the expansion stress of the epoxy resin filled in the notch lj can be dispersed in various directions along the curved surface, and the element chip 100C Peeling off can be made more difficult to occur.
- the device chip 100C is also mounted on the side surface of the remaining substrate portion 1 on the side of the second main surface in the thickness direction, as shown in the light emitting device 700 of FIG.
- a flange-shaped protruding portion If protruding outward can be formed so as to form a part of the cross-section increasing portion lg.
- the manufacturing method can similarly employ the steps shown in FIG.
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Abstract
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/577,477 US7589352B2 (en) | 2003-11-04 | 2004-11-04 | Light emitting device |
| JP2005515209A JP4150980B2 (ja) | 2003-11-04 | 2004-11-04 | 発光素子 |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003375030 | 2003-11-04 | ||
| JP2003375027 | 2003-11-04 | ||
| JP2003-375027 | 2003-11-04 | ||
| JP2003-375030 | 2003-11-04 |
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| WO2005043636A1 true WO2005043636A1 (ja) | 2005-05-12 |
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| PCT/JP2004/016346 Ceased WO2005043636A1 (ja) | 2003-11-04 | 2004-11-04 | 発光素子 |
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| US (1) | US7589352B2 (ja) |
| JP (1) | JP4150980B2 (ja) |
| TW (1) | TW200522397A (ja) |
| WO (1) | WO2005043636A1 (ja) |
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| JP2006324486A (ja) * | 2005-05-19 | 2006-11-30 | Mitsubishi Electric Corp | 半導体発光装置 |
| JP2008131000A (ja) * | 2006-11-24 | 2008-06-05 | Nichia Chem Ind Ltd | 半導体発光素子、半導体発光素子の製造方法及び半導体発光装置 |
| JP2013526032A (ja) * | 2010-04-23 | 2013-06-20 | セミコン・ライト・カンパニー・リミテッド | 化合物半導体発光素子 |
| JP2013131519A (ja) * | 2011-12-20 | 2013-07-04 | Stanley Electric Co Ltd | 発光装置 |
| JP2013535808A (ja) * | 2010-07-07 | 2013-09-12 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | デバイスおよびデバイスの製造方法 |
| JP2014033168A (ja) * | 2012-07-13 | 2014-02-20 | Nichia Chem Ind Ltd | 発光装置 |
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| JP2009004625A (ja) | 2007-06-22 | 2009-01-08 | Sanken Electric Co Ltd | 半導体発光装置 |
| JP2010044967A (ja) * | 2008-08-13 | 2010-02-25 | Sumitomo Electric Ind Ltd | 導電性接着剤およびそれを用いたled基板 |
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| DE102010003321A1 (de) * | 2010-03-26 | 2011-09-29 | Osram Opto Semiconductors Gmbh | Optoelektronisches Bauelement |
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| JP2013105973A (ja) * | 2011-11-16 | 2013-05-30 | Seiko Epson Corp | 発光装置およびその製造方法、並びに、プロジェクター |
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- 2004-11-04 JP JP2005515209A patent/JP4150980B2/ja not_active Expired - Fee Related
- 2004-11-04 TW TW093133711A patent/TW200522397A/zh not_active IP Right Cessation
- 2004-11-04 US US10/577,477 patent/US7589352B2/en not_active Expired - Fee Related
- 2004-11-04 WO PCT/JP2004/016346 patent/WO2005043636A1/ja not_active Ceased
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| JP2006324486A (ja) * | 2005-05-19 | 2006-11-30 | Mitsubishi Electric Corp | 半導体発光装置 |
| JP2008131000A (ja) * | 2006-11-24 | 2008-06-05 | Nichia Chem Ind Ltd | 半導体発光素子、半導体発光素子の製造方法及び半導体発光装置 |
| JP2013526032A (ja) * | 2010-04-23 | 2013-06-20 | セミコン・ライト・カンパニー・リミテッド | 化合物半導体発光素子 |
| JP2013535808A (ja) * | 2010-07-07 | 2013-09-12 | オスラム オプト セミコンダクターズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | デバイスおよびデバイスの製造方法 |
| JP2013131519A (ja) * | 2011-12-20 | 2013-07-04 | Stanley Electric Co Ltd | 発光装置 |
| JP2014033168A (ja) * | 2012-07-13 | 2014-02-20 | Nichia Chem Ind Ltd | 発光装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4150980B2 (ja) | 2008-09-17 |
| TWI358137B (ja) | 2012-02-11 |
| US20070126019A1 (en) | 2007-06-07 |
| JPWO2005043636A1 (ja) | 2007-05-10 |
| US7589352B2 (en) | 2009-09-15 |
| TW200522397A (en) | 2005-07-01 |
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