WO2009079969A1 - Verfahren zum herstellen eines optoelektronischen bauelementes in dünnschichttechnik - Google Patents
Verfahren zum herstellen eines optoelektronischen bauelementes in dünnschichttechnik Download PDFInfo
- Publication number
- WO2009079969A1 WO2009079969A1 PCT/DE2008/001940 DE2008001940W WO2009079969A1 WO 2009079969 A1 WO2009079969 A1 WO 2009079969A1 DE 2008001940 W DE2008001940 W DE 2008001940W WO 2009079969 A1 WO2009079969 A1 WO 2009079969A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- mesas
- connection
- carrier
- epitaxial substrate
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0093—Wafer bonding; Removal of the growth substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
Definitions
- the present invention relates to a method for transferring a thin-film structure of an optoelectronic component, in particular a thin-film LED structure, from an epitaxial substrate to a carrier.
- the layer structure provided for this purpose is produced epitaxially on an epitaxial substrate.
- the epitaxial substrate is, for example, sapphire, but may also be GaN, SiC, silicon, AlN or equivalent (for the growth of AlGaInN layer structures), GaAs, Ge or the like (for the growth of AlGaInP layer structures or AlGaAs layer structures) or InP (for the growth of InGaAsP layer structures).
- the thin-film LED structure is placed on a support, e.g.
- Germanium for example, by soldering terminal pads of the LED structure, which are usually formed by a layer of Ti / Pt / Au, on a corresponding contact surface of the carrier.
- the epitaxial substrate can then be removed.
- the thin-film LED is then permanently attached to the carrier and thus forms a device that in a planned manner z. B. can be mounted in a housing.
- On the epitaxial substrate a plurality of individual LEDs is produced.
- the layer structure of the thin-film LEDs must therefore be divided into the individual LEDs.
- trenches are etched into the epitaxial layers, so that so-called mesas remain, each associated with an LED to be manufactured.
- solder material can basically be applied to both contact surfaces to be connected to one another.
- the carrier and the epitaxial substrate are pressed together with the mutually facing contact surfaces. In doing so, solder undesirably penetrates into the trench between the mesas, where it forms irregular ridges. These manufacturing irregularities cause sacrifices in the yield of viable components and increased expense in controlling mass production, which increases manufacturing costs. These difficulties can z. B. be avoided by the fact that the mesas are etched only after the connection with the carrier. It is instead also possible to structure the carrier according to the LED mesas and to keep the trench between the mesas lot-free in this way; however, this requires accurate adjustment of the carrier on the epitaxial substrate.
- connection carrier assembly which has a plurality of component regions, in each of which at least one electrical connection region is provided, and a semiconductor body carrier, on which a plurality of separate semiconductor bodies connected to the semiconductor body carrier is arranged, wherein the semiconductor bodies each have a semiconductor layer sequence with one have active area.
- the connection carrier assembly and the semiconductor body carrier are aligned relative to one another such that the semiconductor bodies face the device regions.
- a plurality of semiconductor bodies are mechanically connected to the connection carrier assembly in a mounting region of a component region assigned to the respective semiconductor body, and the respective semiconductor body is electrically conductively connected to the connection region of the device region assigned to the semiconductor body.
- connection carrier assembly The semiconductor body connected to the connection carrier assembly is separated from the semiconductor body carrier, and the connection carrier assembly is divided into a plurality of separate optoelectronic components which each have a connection carrier which has the component region and a semiconductor body arranged on the connection carrier and electrically conductively connected to the connection region.
- the object of the present invention is to provide an improved method for transmitting the thin-film LEDs or other thin-film optoelectronic components.
- a solder of one or more solder materials is applied to the mesa structure of the components, for example the LEDs, and a contact coating is applied to a carrier.
- the mesa structure is permanently and optionally electrically conductively fixed on the terminal contact surface of the carrier, so that the components have been transferred to the carrier.
- a solder material is to be understood as meaning a material which can be melted below an upper limit temperature, which is still permissible for the semiconductor material, and alloyed into a contact material which melts at a higher level (that is, at a higher temperature).
- soldering In the soldering process, a low-melting component is used as the solder material and a high-melting component is used as the contact coating. Soldering can be eutectic bonding without increasing the melting point after the joining process or isothermal solidification. After brazing by isothermal solidification, the alloy thus produced has a higher melting point than the components of the solder joint.
- low-melting component for example, pure tin, pure indium or pure gallium in question, but also eutectic mixtures such as gold and tin in the ratio of 80:20 weight percent. With a eutectic composition of the materials, a German low lowering of the melting temperature, so that the process temperature can remain as far below the melting temperatures of the individual components.
- Vapor deposition of the solder material allows the application of a lift-off process for structuring the solder layer on the mesas of the LEDs, without affecting the solubility of a used paint by excessive process temperatures. Thus, even platinum-containing layers can be structured in good quality.
- a solder material instead of a homogeneous alloy, it is preferable to apply a layer sequence which forms a mixture of the materials during the soldering process.
- FIG. 1 shows an arrangement of an epitaxial substrate and a carrier with layers applied thereto in cross-section.
- FIG. 2 shows the arrangement according to FIG. 1 in cross section after assembly of the components.
- FIG. 3 shows an arrangement according to FIG. 1 for a further exemplary embodiment in cross section.
- FIG. 4 shows a cross section according to FIG. 3 after the detachment of a part of the soldered components.
- FIG. 5 shows a cross section according to FIG. 4 with an arrangement of a further carrier.
- FIG. 1 shows in cross-section a substrate 1 with a layer of an optoelectronic semiconductor component produced in thin-film technology, such as a thin-film LED, thin-film IRED or thin-film laser diode, grown thereon, for which reason the substrate 1 is distinguished below from FIG Carrier is referred to as epitaxial substrate.
- the epitaxial substrate 1 is z. Sapphire, GaN, SiC, silicon, AlN, GaAs, Ge or InP.
- B. GaN which is used in particular for blue-emitting thin-film LEDs.
- a mirror layer 6 is usually provided to reflect the generated light in the direction provided for the outcoupling, and may be metallic (and include, for example, Ag, Al, or Au), dielectric (for example, SiO x , SiN x, or the like). , metallic and dielectric (combined and, for example, provided with a lateral structuring) or with TCO (transparent conductive oxide) are produced.
- a barrier layer 7 should be applied thereto, which prevents vertical mixing of the layer stack and may for example be Ti / Pt / Au or may comprise molybdenum, TiN, TiW (N) or the like.
- This layer structure is structured by trenches into a plurality of mesas, each of which forms a device, in this example a thin-film LED.
- the connecting layers are then pressed against one another and permanently connected to one another and, if necessary, electrically conductively connected by producing the solder connection.
- the materials of the interconnect layers can be selected to be electrically conductive for this purpose; In addition, the materials should preferably be thermally conductive.
- FIG. 2 shows the arrangement according to FIG. 1 after the connection of the first connection layer 2 and the second connection layer 3.
- a third connection layer 31 is formed in each case from the solder material of the first connection layer 2 and the contact material of the second connection layer 3 in the areas above the mesas while a remaining portion 32 of the second connection layer 3 remains over the gaps 4.
- the solder material of the first connection layer 2 is alloyed into the contact material of the second connection layer 3.
- the epitaxial substrate 1 can then be removed, and the LEDs can be singulated and processed in the usual way.
- An embodiment of the first interconnection layer 2 provides a layer sequence comprising on the barrier layer successively the materials titanium, platinum, tin, titanium and gold.
- the second connection layer 3 is Ti / Pt / Au in this example.
- the proportions of gold and tin are preferably selected such that an 80/20 eutectic of ⁇ - (Au 5 Sn) + ⁇ -AuSn is formed during the soldering process (Au and Sn approximately in the ratio of 80:20 weight percent). For this purpose, z. B.
- molybdenum may additionally be provided in the barrier layer 7, which forms a ternary phase equilibrium with gold and tin.
- a barrier of Ti: N, TiW: N or the like be provided in the barrier layer 7, a barrier of Ti: N, TiW: N or the like.
- tin is used as an essential component of the solder material.
- the invention is not limited to the use of a tin-containing compound layer, as the embodiments described below show.
- the first bonding layer 2 uses as the first bonding layer 2 a bismuth layer which is covered with a thin Ti / Au layer or Au layer.
- the bismuth can be patterned by etching with hot sulfuric acid or 5% silver nitrate solution.
- a possible layer structure for example, 100 nm titanium / 1000 nm bismuth / 100 nm gold as a first interconnect layer 2 and 50 nm platinum / 200 nm TiW: N / 1000 nm gold as second 'connection layer. 3
- a sufficiently thick first interconnect layer 2 made of gold is applied and used to form a gold-germanium eutectic, a carrier 10 made of germanium with a thin second bonding layer 3 made of gold.
- the carrier 10 may be a germanium wafer or may comprise only one layer of germanium. Silicon can be used instead of germanium.
- germanium a layer sequence of 100 nm of titanium, 100 nm of platinum and 1000 nm of gold would be applied as first interconnection layer 2, for example.
- the second connection layer 3 on the carrier would be z. B. a layer of 50 nm gold.
- the method z. B. is modified as follows.
- a barrier layer 7 z. B. a layer sequence of TiW: N, platinum and gold are provided.
- a suitable wetting layer can be applied, the z. B. 50 nm platinum and then 50 nm gold.
- the gaps 4 are etched as trenches to form the mesas of the LEDs.
- the mesaflanken are coated with a Passivitations- layer 8, z. B. SiN x provided.
- the first interconnection layer 2 is formed by tin over the entire surface in a thickness of typically about 800 nm is applied.
- This layer is covered with 10 nm of titanium and then 100 nm of gold as protection against diffusion and oxidation of the tin.
- the carrier may, for. B. germanium, which is preferably provided on the upper side with a barrier layer.
- As a second compound layer 3 gold is applied, for. In a typical thickness of about 1060 nm.
- the tin layer melts and withdraws from the surfaces of the passivation layer 8 to the Au / Pt-containing layers or forms on the passivation layer 8 beads, which are later z.
- B. with FeCl 3 solution or with HNO 3 / C 2 H 5 OH (1: 49) can be etched away.
- a kind of self-adjustment of the first connection layer 2 on the barrier layer 7 is effected, so that the removal of the hatched in Figure 1 highlighted portions 9 can be omitted.
- As Passivitations Mrs 8 also other silicon-containing compounds come into question, such as. As SiO x , SiNO x , SiC or the like.
- the material of the passivation layer 8 is used for this embodiment chosen so that it is not wetted by tin or a tin-containing melt.
- a reactive soldering process as in the example with tin, gold and platinum, makes it possible to etch away the solder balls forming on the passivation layer 8 selectively with respect to the solder material that has reacted chemically.
- the stated ratios of the components of the solder material and the layer thicknesses can be varied within the scope of the invention.
- the formation of a binary eutectic can be varied, such.
- B. in the system of gold and tin B. the ⁇ - (Au 5 Sn) phase is provided as the main component of the solder.
- B. typically choose about 2900 nm.
- the process of transfer may optionally be carried out in several steps using multiple carriers, with only a certain proportion of the components is transmitted.
- the detachment of the mesas from the epitaxial substrate can take place, for example, by means of laser radiation, which enables a locally limited detachment of a GaN layer from the epitaxial substrate, in particular in the production of GaN diodes.
- the manufacturing process initially • specified in the prior art can be used analogously.
- FIG. 3 shows an arrangement of a semiconductor layer 5 divided into mesas by interspaces 4 on an epitaxial substrate 1. Every second mesa of the series of mesas visible in the cross-section has been provided with a first bonding layer 2 of one or more brazing materials. These mesas are soldered to a second connection layer 3 on a support.
- the semiconductor layer 5 can be provided for example for the production of UV light-emitting diodes (UV LEDs) and be AlGaN, epitaxially grown on a substrate 1 made of AlN.
- UV LEDs UV light-emitting diodes
- a barrier layer is applied, which can be done as in conventional methods and is not shown in FIG.
- the subdivision of the mesas can be done photolithographically; the gaps 4 can be made by trench etching.
- the relatively low-melting first interconnection layer 2 may be, for example, 50 nm Ti / 2000 nm Bi / 150 nm Au
- the second interconnection layer 3 of the higher-melting contact material may be, for example, 400 nm TiW / 2000 nm Au over the entire surface.
- the carrier 10 is marked at the in FIG. 3 by the dot-dash lines 11 Subdivided sites, and the soldered components are detached from the epitaxial substrate 1. This can be done by means of a selective laser lift-off method, with which the semiconductor layer 5 of the relevant components is lifted off the epitaxial substrate .1 in each case.
- FIG. 4 shows the arrangement after the soldered components 12 have been lifted off. It can be seen in this cross section that the components not yet soldered remain as mesas on the epitaxial substrate 1 and are thus held in conjunction with the epitaxial substrate 1. The remaining mesas can also be transferred to carriers in further process steps.
- FIG. 5 shows an arrangement of the epitaxial substrate 1 with the remaining portions of the semiconductor layer 5, which have now been provided with a further first connection layer 2 of relatively low melting solder material.
- a further carrier 10a with a further second connection layer 3a made of a higher melting contact material is used. The remaining method steps correspond from here on from the embodiment described above.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020107015696A KR101522055B1 (ko) | 2007-12-20 | 2008-11-21 | 박막 기술을 이용한 광전 소자의 제조 방법 |
CN2008801216129A CN101904021B (zh) | 2007-12-20 | 2008-11-21 | 用于以薄膜技术制造光电子器件的方法 |
EP08864768A EP2223348A1 (de) | 2007-12-20 | 2008-11-21 | Verfahren zum herstellen eines optoelektronischen bauelementes in dünnschichttechnik |
US12/809,779 US8247259B2 (en) | 2007-12-20 | 2008-11-21 | Method for the production of an optoelectronic component using thin-film technology |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007061471.5 | 2007-12-20 | ||
DE102007061471 | 2007-12-20 | ||
DE102008026839.9 | 2008-06-05 | ||
DE102008026839A DE102008026839A1 (de) | 2007-12-20 | 2008-06-05 | Verfahren zum Herstellen eines optoelektronischen Bauelements in Dünnschichttechnik |
Publications (1)
Publication Number | Publication Date |
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WO2009079969A1 true WO2009079969A1 (de) | 2009-07-02 |
Family
ID=40690888
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2008/001940 WO2009079969A1 (de) | 2007-12-20 | 2008-11-21 | Verfahren zum herstellen eines optoelektronischen bauelementes in dünnschichttechnik |
Country Status (7)
Country | Link |
---|---|
US (1) | US8247259B2 (de) |
EP (1) | EP2223348A1 (de) |
KR (1) | KR101522055B1 (de) |
CN (1) | CN101904021B (de) |
DE (1) | DE102008026839A1 (de) |
TW (1) | TWI378577B (de) |
WO (1) | WO2009079969A1 (de) |
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US7057256B2 (en) | 2001-05-25 | 2006-06-06 | President & Fellows Of Harvard College | Silicon-based visible and near-infrared optoelectric devices |
US7442629B2 (en) | 2004-09-24 | 2008-10-28 | President & Fellows Of Harvard College | Femtosecond laser-induced formation of submicrometer spikes on a semiconductor substrate |
US9911781B2 (en) | 2009-09-17 | 2018-03-06 | Sionyx, Llc | Photosensitive imaging devices and associated methods |
US9673243B2 (en) | 2009-09-17 | 2017-06-06 | Sionyx, Llc | Photosensitive imaging devices and associated methods |
US8692198B2 (en) | 2010-04-21 | 2014-04-08 | Sionyx, Inc. | Photosensitive imaging devices and associated methods |
CN103081128B (zh) | 2010-06-18 | 2016-11-02 | 西奥尼克斯公司 | 高速光敏设备及相关方法 |
KR101144482B1 (ko) | 2010-10-06 | 2012-05-11 | (주)제너진 | 엔진의 직분사 인젝터 |
US9496308B2 (en) | 2011-06-09 | 2016-11-15 | Sionyx, Llc | Process module for increasing the response of backside illuminated photosensitive imagers and associated methods |
US20130016203A1 (en) | 2011-07-13 | 2013-01-17 | Saylor Stephen D | Biometric imaging devices and associated methods |
US9064764B2 (en) | 2012-03-22 | 2015-06-23 | Sionyx, Inc. | Pixel isolation elements, devices, and associated methods |
JP6466346B2 (ja) | 2013-02-15 | 2019-02-06 | サイオニクス、エルエルシー | アンチブルーミング特性を有するハイダイナミックレンジcmos画像センサおよび関連づけられた方法 |
WO2014151093A1 (en) | 2013-03-15 | 2014-09-25 | Sionyx, Inc. | Three dimensional imaging utilizing stacked imager devices and associated methods |
CN105849907B (zh) * | 2013-06-29 | 2019-11-15 | 西奥尼克斯股份有限公司 | 浅槽纹理区域和相关方法 |
WO2014209421A1 (en) | 2013-06-29 | 2014-12-31 | Sionyx, Inc. | Shallow trench textured regions and associated methods |
KR101767078B1 (ko) | 2013-07-29 | 2017-08-10 | 에피스타 코포레이션 | 반도체 소자를 선택적으로 전이하는 방법 |
JP2018506166A (ja) * | 2015-08-18 | 2018-03-01 | ゴルテック.インク | マイクロ発光ダイオードの事前排除方法、製造方法、装置及び電子機器 |
FR3041148A1 (fr) | 2015-09-14 | 2017-03-17 | Valeo Vision | Source lumineuse led comprenant un circuit electronique |
JP2019140400A (ja) * | 2019-04-08 | 2019-08-22 | ゴルテック.インク | マイクロ発光ダイオードの事前排除方法、製造方法、装置及び電子機器 |
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- 2008-11-21 US US12/809,779 patent/US8247259B2/en active Active
- 2008-11-21 WO PCT/DE2008/001940 patent/WO2009079969A1/de active Application Filing
- 2008-11-21 KR KR1020107015696A patent/KR101522055B1/ko not_active IP Right Cessation
- 2008-11-21 CN CN2008801216129A patent/CN101904021B/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
KR20100097215A (ko) | 2010-09-02 |
DE102008026839A1 (de) | 2009-07-02 |
TW200939544A (en) | 2009-09-16 |
US8247259B2 (en) | 2012-08-21 |
US20110053308A1 (en) | 2011-03-03 |
KR101522055B1 (ko) | 2015-05-20 |
CN101904021B (zh) | 2013-03-13 |
TWI378577B (en) | 2012-12-01 |
CN101904021A (zh) | 2010-12-01 |
EP2223348A1 (de) | 2010-09-01 |
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