EP1297579A1 - Strahlung emittierender halbleiterchip und verfahren zu dessen herstellung - Google Patents
Strahlung emittierender halbleiterchip und verfahren zu dessen herstellungInfo
- Publication number
- EP1297579A1 EP1297579A1 EP01943138A EP01943138A EP1297579A1 EP 1297579 A1 EP1297579 A1 EP 1297579A1 EP 01943138 A EP01943138 A EP 01943138A EP 01943138 A EP01943138 A EP 01943138A EP 1297579 A1 EP1297579 A1 EP 1297579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- semiconductor chip
- substrate
- active layer
- radiation
- emitting semiconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004065 semiconductor Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 7
- 230000005855 radiation Effects 0.000 title claims 2
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 230000001154 acute effect Effects 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 229910002601 GaN Inorganic materials 0.000 claims description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 229910052594 sapphire Inorganic materials 0.000 claims description 2
- 239000010980 sapphire Substances 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 239000013256 coordination polymer Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
Definitions
- the invention relates to a radiation-emitting semiconductor chip having an active layer and a multiplicity of side surfaces which laterally delimit the extension of the active layer.
- the invention further relates to a method for producing a radiation-emitting semiconductor chip, in which an active layer is first formed above a surface of a substrate and in which the substrate is then separated into semiconductor chips together with the active layer.
- a radiation-emitting semiconductor chip is known from JP 10-32 69 10 A, which has the shape of a truncated pyramid.
- the active layer of the known semiconductor chip is located in a central region of the semiconductor chip. Crystalline layers are located above the active layer.
- the base area running parallel to the active layer is diamond-shaped. The special design of the base area facilitates the light emission from the semiconductor chip. After a few total reflections, the light rays hit an outer surface at an angle that is smaller than the critical angle. Due to the special design of the truncated pyramid-shaped semiconductor chip, the efficiency when decoupling the photons is relatively high.
- a disadvantage of the known semiconductor chip is that the cross-sectional area varies between the base area used for attaching an electrode and an opposite top side, which is also provided with an electrode. Due to the decreasing cross section of the base Semiconductor chips make it difficult to dissipate heat. In addition, the current flow is hindered by the reduced cross section, so that the ohmic resistance increases locally in the semiconductor chip. Both together lead to a locally different, increased thermal load on the semiconductor chip. The resulting voltages in the semiconductor chip, however, affect the life of the semiconductor chip. In addition, the conversion efficiency of the active layer is reduced by the increased thermal load.
- the object of the invention is to create a semiconductor chip with good optical coupling and uniform thermal stress.
- the semiconductor chip has at least two parallelogram-shaped side surfaces provided with an acute angle.
- the prism-shaped design of the semiconductor chip with two tilted parallelogram-shaped side faces ensures on the one hand that the light emanating from the active layer can leave the semiconductor chip with a small number of reflections.
- the light rays that leave the active layer in the direction of the base surface largely hit the beveled side surfaces and are reflected on an opposite side surface, where they strike at an angle that is smaller than the critical angle for the total reflection.
- the semiconductor chip has a uniform cross section, so that the thermal load across the semiconductor chip is homogeneous. This effectively prevents voltages in the semiconductor chip.
- the semiconductor chip according to the invention therefore has not only good optical coupling but also a homogeneous and low thermal load.
- the invention is also based on the object of creating a method for producing the semiconductor chip.
- This object is achieved according to the invention in that the semiconductor chips are separated along a separating surface which runs obliquely to the surface.
- FIG. 1 shows a perspective view of a semiconductor chip
- FIG. 2 shows a top view of the semiconductor chip from FIG. 1;
- FIG. 3 shows a side view of the semiconductor chip from FIG. 1;
- FIG. 4 shows a cross section with possible light paths in the semiconductor chip from FIG. 1;
- FIG. 5 is a diagram in which the degree of decoupling as a function of different base angles of the geometric shape of the semiconductor chip
- FIG. 1 shows a semiconductor chip 1 which has a substrate 2.
- the substrate 2 is prism-shaped and, in addition to a base area 3 and an upper side 4, has side areas 5, each of which has the shape of a tilted parallelogram.
- a layer sequence 6 with an active layer, on which a circular electrode 7 is arranged, is applied to the upper side 4 of the substrate 2.
- Another electrode, which is not shown in FIG. 1, is located on the base 3 of the substrate 2.
- FIG. 2 shows a cross section through the substrate 2 parallel to the base 3 and to the top 4.
- the cross section like the base area 3, is designed as a tilted parallelogram with an acute angle ⁇ .
- the side faces 5 are also formed as tilted parallelograms with an acute angle ⁇ .
- the formation of the substrate 2 as a parallelepiped with parallelogram-shaped side surfaces which have an acute angle is advantageous for the coupling out of light.
- This is clear from Figure 4.
- a point-shaped light source 8 within the substrate 2. If, for example, a light beam 9 occurs at an angle a to the surface normal on the upper side 4, the angle ⁇ being greater than the angle of the total reflection a c , it becomes at the Top 4 reflected.
- the angle of incidence oi x is also greater than the critical angle for total reflection a c .
- the light beam 9 is therefore also reflected on the side surface 5.
- the angle of incidence is smaller than the critical angle o c for total reflection.
- the influence of the horizontal base angle ⁇ is less than that of the vertical base angle ⁇ .
- the base area 3 of the substrate 2 was assumed to be 50% absorbent. This is actually the case when the semiconductor chip 1 is mounted with a silver conductive adhesive on a carrier. As a result, the light rays reflected back into the substrate 2 are weakened. It is therefore advantageous if the base area 3 is designed to be reflective.
- the layer sequence 6 is produced on the basis of AlInGaN or, for example, AlGalnP with transparent window layers made of GaP.
- Materials such as sapphire, gallium nitride, zinc oxide, diamond or quartz glass can also be used for the substrate 2 instead of silicon carbide.
- the formation of the substrate as a parallelepiped with tilted parallelograms as side surfaces also has the advantage that the cross section of the substrate 2 remains the same from the base surface 3 to the top 4. As a result, the heat can be dissipated evenly from the layer sequence 6.
- the ohmic resistance of the substrate 2 is also the same from the top 4 to the base 3. As a result, the voltage drop across the substrate 2 remains low and is evenly distributed. Overall, the semiconductor chip 1 is therefore subjected to uniform thermal stress. There are therefore no voltages in the semiconductor chip 1.
- the current can flow freely between the active layer and the electrode arranged on the base area 3 owing to the uniform cross section of the substrate 2.
- the semiconductor chip 1 is therefore also distinguished by a low forward voltage.
- the substrate 2 is first provided with the layer sequence 6. Subsequently, the substrate 2 can be sawn with the aid of a sawing device with an inclined saw blade. With such a sawing method there is no loss of active area and of the substrate. This is particularly advantageous if the production of the substrate 2 and the growth of the layer sequence 6 are associated with high costs.
- the semiconductor chips presented here are particularly suitable for producing luminescent diodes in the spectral range mentioned, from the ultraviolet to the infrared.
Landscapes
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10032838.5A DE10032838B4 (de) | 2000-07-06 | 2000-07-06 | Strahlung emittierender Halbleiterchip und Verfahren zu dessen Herstellung |
| DE10032838 | 2000-07-06 | ||
| PCT/DE2001/001952 WO2002003477A1 (de) | 2000-07-06 | 2001-05-22 | Strahlung emittierender halbleiterchip und verfahren zu dessen herstellung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1297579A1 true EP1297579A1 (de) | 2003-04-02 |
Family
ID=7647987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01943138A Withdrawn EP1297579A1 (de) | 2000-07-06 | 2001-05-22 | Strahlung emittierender halbleiterchip und verfahren zu dessen herstellung |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US6858881B2 (de) |
| EP (1) | EP1297579A1 (de) |
| JP (1) | JP2004503094A (de) |
| DE (1) | DE10032838B4 (de) |
| TW (1) | TWI229459B (de) |
| WO (1) | WO2002003477A1 (de) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139723A1 (de) * | 2001-08-13 | 2003-03-13 | Osram Opto Semiconductors Gmbh | Strahlungsemittierender Chip und strahlungsemittierendes Bauelement |
| JP3705791B2 (ja) * | 2002-03-14 | 2005-10-12 | 株式会社東芝 | 半導体発光素子および半導体発光装置 |
| WO2004088326A2 (en) * | 2003-03-28 | 2004-10-14 | Aphton Corporation | Gastrin hormone immunoassays |
| US7033912B2 (en) * | 2004-01-22 | 2006-04-25 | Cree, Inc. | Silicon carbide on diamond substrates and related devices and methods |
| US7612390B2 (en) * | 2004-02-05 | 2009-11-03 | Cree, Inc. | Heterojunction transistors including energy barriers |
| US7294324B2 (en) * | 2004-09-21 | 2007-11-13 | Cree, Inc. | Low basal plane dislocation bulk grown SiC wafers |
| US7422634B2 (en) * | 2005-04-07 | 2008-09-09 | Cree, Inc. | Three inch silicon carbide wafer with low warp, bow, and TTV |
| US7709269B2 (en) | 2006-01-17 | 2010-05-04 | Cree, Inc. | Methods of fabricating transistors including dielectrically-supported gate electrodes |
| US7592211B2 (en) * | 2006-01-17 | 2009-09-22 | Cree, Inc. | Methods of fabricating transistors including supported gate electrodes |
| WO2008073400A1 (en) | 2006-12-11 | 2008-06-19 | The Regents Of The University Of California | Transparent light emitting diodes |
| US20120313213A1 (en) * | 2011-06-07 | 2012-12-13 | Raytheon Company | Polygon shaped power amplifier chips |
| KR101189014B1 (ko) | 2011-06-14 | 2012-10-08 | 서울옵토디바이스주식회사 | 반도체 발광 소자, 그 제조 방법 및 이를 포함하는 반도체 발광 소자 패키지 |
| JP5995563B2 (ja) * | 2012-07-11 | 2016-09-21 | 株式会社ディスコ | 光デバイスの加工方法 |
| CN103811613A (zh) * | 2012-11-15 | 2014-05-21 | 展晶科技(深圳)有限公司 | 发光二极管磊晶结构 |
| TWD161897S (zh) | 2013-02-08 | 2014-07-21 | 晶元光電股份有限公司 | 發光二極體之部分 |
| USD847102S1 (en) | 2013-02-08 | 2019-04-30 | Epistar Corporation | Light emitting diode |
| US11037911B2 (en) * | 2017-12-27 | 2021-06-15 | Nichia Corporation | Light emitting device |
| US11592166B2 (en) | 2020-05-12 | 2023-02-28 | Feit Electric Company, Inc. | Light emitting device having improved illumination and manufacturing flexibility |
| US11876042B2 (en) | 2020-08-03 | 2024-01-16 | Feit Electric Company, Inc. | Omnidirectional flexible light emitting device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5087949A (en) * | 1989-06-27 | 1992-02-11 | Hewlett-Packard Company | Light-emitting diode with diagonal faces |
| EP0405757A3 (en) | 1989-06-27 | 1991-01-30 | Hewlett-Packard Company | High efficiency light-emitting diode |
| JPH0478174A (ja) * | 1990-07-19 | 1992-03-12 | Nec Corp | 半導体発光素子 |
| US5340772A (en) * | 1992-07-17 | 1994-08-23 | Lsi Logic Corporation | Method of increasing the layout efficiency of dies on a wafer and increasing the ratio of I/O area to active area per die |
| JP3557011B2 (ja) * | 1995-03-30 | 2004-08-25 | 株式会社東芝 | 半導体発光素子、及びその製造方法 |
| JP3176856B2 (ja) * | 1995-12-14 | 2001-06-18 | 沖電気工業株式会社 | 端面発光型led、端面発光型ledアレイ、光源装置及びそれらの製造方法 |
| JP3504079B2 (ja) * | 1996-08-31 | 2004-03-08 | 株式会社東芝 | 半導体発光ダイオード素子の製造方法 |
| JPH10326910A (ja) * | 1997-05-19 | 1998-12-08 | Song-Jae Lee | 発光ダイオードとこれを適用した発光ダイオードアレイランプ |
| US6229160B1 (en) | 1997-06-03 | 2001-05-08 | Lumileds Lighting, U.S., Llc | Light extraction from a semiconductor light-emitting device via chip shaping |
| JPH11340576A (ja) * | 1998-05-28 | 1999-12-10 | Sumitomo Electric Ind Ltd | 窒化ガリウム系半導体デバイス |
| US20030137031A1 (en) * | 2002-01-23 | 2003-07-24 | Tai-Fa Young | Semiconductor device having a die with a rhombic shape |
-
2000
- 2000-07-06 DE DE10032838.5A patent/DE10032838B4/de not_active Expired - Fee Related
-
2001
- 2001-05-22 EP EP01943138A patent/EP1297579A1/de not_active Withdrawn
- 2001-05-22 WO PCT/DE2001/001952 patent/WO2002003477A1/de not_active Ceased
- 2001-05-22 JP JP2002507456A patent/JP2004503094A/ja not_active Withdrawn
- 2001-07-02 TW TW090116106A patent/TWI229459B/zh not_active IP Right Cessation
-
2003
- 2003-01-06 US US10/337,089 patent/US6858881B2/en not_active Expired - Lifetime
-
2004
- 2004-09-24 US US10/949,915 patent/US6972212B2/en not_active Expired - Lifetime
Non-Patent Citations (2)
| Title |
|---|
| None * |
| See also references of WO0203477A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6858881B2 (en) | 2005-02-22 |
| DE10032838A1 (de) | 2002-01-24 |
| WO2002003477A1 (de) | 2002-01-10 |
| US20050042843A1 (en) | 2005-02-24 |
| TWI229459B (en) | 2005-03-11 |
| JP2004503094A (ja) | 2004-01-29 |
| US6972212B2 (en) | 2005-12-06 |
| US20030107045A1 (en) | 2003-06-12 |
| DE10032838B4 (de) | 2015-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20030109 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| RBV | Designated contracting states (corrected) |
Designated state(s): DE |
|
| 17Q | First examination report despatched |
Effective date: 20061220 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM OPTO SEMICONDUCTORS GMBH |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: OSRAM OPTO SEMICONDUCTORS GMBH |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20101202 |