WO2014049038A1 - Verfahren zum vereinzeln von bereichen einer halbleiterschicht - Google Patents
Verfahren zum vereinzeln von bereichen einer halbleiterschicht Download PDFInfo
- Publication number
- WO2014049038A1 WO2014049038A1 PCT/EP2013/070042 EP2013070042W WO2014049038A1 WO 2014049038 A1 WO2014049038 A1 WO 2014049038A1 EP 2013070042 W EP2013070042 W EP 2013070042W WO 2014049038 A1 WO2014049038 A1 WO 2014049038A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor layer
- mask
- region
- coupling
- out structure
- 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.)
- Ceased
Links
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]
- H10H20/01—Manufacture or treatment
-
- 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
- H10H20/821—Bodies characterised by their shape, e.g. curved or truncated substrates of the light-emitting regions, e.g. non-planar junctions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
Definitions
- the invention relates to a method for isolating regions of a semiconductor layer according to claim 1 and an optoelectronic semiconductor chip according to claim 8.
- This patent application claims the priorities of German Patent Applications 10 2012 217 524.5 and 10 2012 220 909.3, the disclosure of which is hereby incorporated by reference in ⁇ . From DE 10 2011 010 503 Al it is known to provide a semiconductor ⁇ layer of an optoelectronic semiconductor chip with a mask and introduce a coupling-out structure in a coupling-out side of the semiconductor layer. Subsequently, the mask is removed and, with the aid of a second mask, the semiconductor layer is also separated by an etching process into individual regions from which individual semiconductor chips are later produced.
- the object of the invention is to provide a simpler and faster method for separating areas of a
- the method described has the advantage that only with a mask and in a method step, the decoupling ⁇ structure is introduced into the semiconductor layer and at the same time at least a portion of the semiconductor layer is separated.
- the described method is easy, inexpensive and fast to carry out.
- an optoelectronic semiconductor chip with a semiconductor layer for producing light is produced.
- the mesa etch is obtained a non-roughened edge to the semiconductor chip.
- the chip edge is easier to check for defects or contaminants in an ex ⁇ closing optical control. This increases the reliability of the optical control.
- the chip edge is also roughened and thus the chip edge looks very wavy in the control, so that a clear definable limit for the automatic control is difficult to see.
- the mask is applied in one embodiment in one process step and thus has a uniform thickness.
- a hard mask is used as a mask.
- the hard mask is easy to manufacture, inexpensive and allows a precise structuring of the coupling-out structure and the separation of a region of the semiconductor layer.
- the hard mask is a resist mask.
- a gaseous or liquid etching medium is used as etchant.
- the use of gaseous or liquid etching media is a known technique and allows cost-effective implementation of the method.
- the etching process is a dry etching process.
- a plasma is used in the dry etching process. For example, this is a Cl plasma.
- the method described is particularly suitable for the introduction of a coupling-out structure into an epitaxially applied semiconductor layer.
- the table epitak ⁇ grown semiconductor layer may be formed in the form of a gallium nitride layer ⁇ .
- a further structuring step is carried out in order to provide the previously covered regions of the semiconductor layer with a coupling-out structure. In this way the efficiency for coupling out light is improved.
- FIG. 1 shows a schematic representation of a first method step
- FIG. 2 shows a schematic representation of a second method step
- FIG. 3 shows a schematic plan view of a semiconductor layer with a mask
- FIG. 1 shows, in a schematic sectional view, a semiconductor layer 2, on the upper side of which a structured mask 1 is applied.
- the semiconductor layer 2 may be disposed on ei ⁇ NEM carrier 20, as shown.
- the carrier 20 may comprise, for example, Ge, Si, GaAs, AlN or SiN or consist of a corresponding layer of Ge, Si, GaAs, AlN or SiN.
- the mask 1 is formed for example in the form of a hard mask.
- the hard mask may comprise, for example, Si ⁇ liziumnitrid or silicon oxide.
- the hard mask can also be a resist mask.
- Patterning of the mask is carried out by lithographic processing using photoresist and appropriate etching media.
- an etching process with hydrofluoric acid (HF) or a hydrofluoric acid buffered with ammonia can be carried out for structuring or for removing the mask.
- the semiconductor layer 2 has, for example, an upper first doped semiconductor layer 3. Adjacent to the first semiconductor layer 3, a second doped semiconductor ⁇ layer 4 is provided.
- the first semiconductor layer 3 may be ne ⁇ gativ doped and the second semiconductor layer 4 may be positively doped.
- the first semiconductor layer 3 may be positively doped and the second semiconductor layer 4 may be negatively doped.
- an active zone 5 is formed for generating light.
- more complex layer structures may also be provided for the formation of an active zone 5.
- the active region 5 may be formed of a sequence of ten Schich ⁇ with different dopings.
- the semiconductor layer 2 represents for example a specific ⁇ optoelectronic semiconductor layer, in particular a LED semiconductor chip.
- the structured Mas ⁇ ke 1 is applied on the first semiconductor layer 3.
- the semiconductor layer 2 may also comprise other or additional layers, in particular a mirror layer.
- the mask 1 has first mask elements 10 and second mask elements 12. Between a first mask element 10 and a further first mask element 10 or between a first mask element 10 and a second mask element 12, a first opening 40 is provided in each case.
- the width of the first opening 40 ie a first distance 13 between a first mask element 10 and a further first mask element 10 or between a first mask element 10 and a second mask element 12 lies in a first area.
- the first distances 13 between two ers ⁇ th mask elements 10 and a first mask member 10 and second mask member 12 are equal.
- the second Mas ⁇ kenelement 12 is arranged in each case circumferentially around a portion of the semiconductor layer.
- the second mask element 12 may have a width of, for example, 10 ⁇ to 5 ⁇ .
- the first mask elements 10 preferably have the same width along an x-axis shown in FIG.
- the width of the second mask element 12 along the x-axis is greater than the width of the first mask elements 10 ent ⁇ long of the x-axis.
- a second opening 41 is provided between two second mask elements 12.
- the second opening 41 has a larger second width 14 than the first opening 40 in the x-axis.
- two adjacent second mask elements 12 have a larger second distance 14 than two adjacent first mask elements 10.
- two adjacent second mask elements 12 have a larger second distance 14 than a second mask element 12 of a first mask element 10.
- the first distance 13 is thus smaller than the second distance 14.
- the first distance 13 is determined in such a way that during an etching process, a desired recess is introduced into the semiconductor layer 2, which forms part of an optical coupling-out structure.
- the second distance 14 is selected in such a way that at the same time during the etching process for the introduction of the optically decoupled a separation trench structure is ⁇ introduced into the semiconductor layer 2 is extending through the entire thickness of the semiconductor layer ⁇ . 2
- the second distance can be, for example, between 1.5 ⁇ and 2.5 ⁇ .
- the size of the second Abstand 14 depends on the thickness and the material of the semiconductor ⁇ conductor layer 2 and of the etching method used, in particular of the etching medium. As etching medium, for example, KOH or phosphoric acid can travel ⁇ for a wet chemical ⁇ tzver be used.
- FIG. 2 shows the arrangement of FIG. 1 after carrying out the etching process.
- a respective recess 15 is introduced into the semiconductor layer 2.
- a separating trench 16 is introduced into the semiconductor layer 2 between two second mask elements 12.
- the recesses 15 have boundary surfaces 17, 18, which support a decoupling of a light generated by the active zone 5.
- the dividing trench 16 extends over the entire thickness of the semiconductor layer 2. If the dividing trench 16 is formed as a closed ring in the plane of the semiconductor layer 2, the formation of the dividing trench 16 separates a first and a second region 19, 20 of the semiconductor layer 2, ie a mesa etch. Through the separation trench 16, a portion of the semiconductor layer 2 is separated, whereby a semiconductor chip such. B. a LED chip is isolated.
- the different areas of the carrier 20 can be separated by a wide ⁇ res etching process and / or by a laser cutting process along the isolation trench sixteenth
- an opto electro ⁇ nic semiconductor chip, in particular an LED with a loading can be made rich of the semiconductor layer.
- the boundary surfaces 17, 18 close with the plane of the layer 2 an angle of for example 35 ° to 75 °, preferably 50 ° to 70 °.
- the concrete angle is predetermined by a crystal direction of the doped first semiconductor layer 3 and the chemical removal.
- the etching depth, ie the depth of the recesses 15 may be in the range of micrometers.
- the recesses 15 may have pyramidal Vertie ⁇ tions.
- the recesses 15 have the shape of pyramids, which are particularly suitable for the decoupling of electromagnetic radiation in the visible wavelength range, ie at wavelengths between 0.3 ⁇ and about 0.8 ⁇ .
- Diameter of a base of the pyramidal recesses 15 denförmigen ⁇ is also rich in Mikrometerbe. The diameter is thus significantly larger than the wavelength of the electromagnetic radiation.
- the base of the pyramidal recess has, in the formation of the first semiconductor layer 3 made of gallium nitride, a hexagonal shape. After removing the mask 1, a plurality of singulated semiconductor chips are obtained, wherein a central portion of each semiconductor chip is roughened. The roughened central area is surrounded by a smooth, non-roughened edge which was covered by the second mask element 12 during the etch.
- the mask 1 is then removed, and the then exposed portions of the upper ⁇ surface of the first semiconductor layer 3 with a further etching step roughened.
- the areas covered in the first etching step are also provided with a coupling-out structure.
- the semiconductor layer may be epitaxially grown
- Layer structure to be executed with multiple layers may consist of a III-V semiconductor material.
- a layer of semi ⁇ conductor layer may be carried out on the basis of GaN, GaInN, or A1N.
- a layer based on InGaAlN can be built up be.
- InGaAlN-based layer structures fall in particular those in which the epitaxially produced
- Layer structure usually has a layer sequence of different ⁇ single layers containing at least one single layer containing a material from the III-V
- the layered structures comprising at least one InGaAlN-based active layer or active region can emit electromagnetic radiation in an ultraviolet to green wavelength range.
- the layer structure comprising at least one active layer or an active region based on InGaAlP for example, can preferably emit electromagnetic radiation with one or more spectral components in a green to red wavelength range.
- the layers of the semiconductor layer may also contain other III-V-
- Compound semiconductor material systems for example an Al-GaAs-based material, or I I -VI -
- An II-VI compound semiconductor material system may include at least one element of the second main group such as Be, Mg, Ca, Sr, and a sixth main group element such as O, S, Se.
- an II-VI compound semiconductor material system comprises a binary, ternary or quaternary compound comprising at least one element from the second main group and at least one element from the sixth main group.
- Such a binary, ternary or quaternary compound can also, for example, one or more dopants and additional constituents aufwei ⁇ sen.
- FIG. 3 shows a schematic representation of a plan view of a semiconductor layer 2 provided with a mask 1.
- the mask 1 is in the form of multiple Maskenbe ⁇ rich 30 is formed. Each mask area 30 covers ei ⁇ nen area of the semiconductor layer 2, which is separated by the Sequence etching of the semiconductor chip.
- the mask 1 has identical mask areas 30 in the illustrated embodiment. Each mask region 30 is of identical design and essentially has a rectangular Mas ⁇ ken harsh, in each of 12 first openings 40 are introduced introduced.
- each 4 first openings 40 are arranged side by side, wherein three rows of four first openings 40 are provided.
- Two mask areas 30 are separated from each other by a second opening 41.
- the second openings 41 form a rectangular striped pattern.
- Two mask areas 30 each have a second distance 14 in both an x-axis and a y-axis from each other.
- the x- and y-axis are perpendicular to each other and are shown schematically in Figure 3.
- the first openings 40 each have a first distance 13 both in the x-direction and in the y-direction.
- FIG. 2 is severed by the formation of the separation trench, ie individual semiconductor chips of the semiconductor layer 2 are singulated.
- 40 corresponding pyramid-shaped recesses 15 are introduced into the half ⁇ conductor layer 2 through the first openings, that a central region of the Semiconductor chips are roughened. The central area is surrounded by a smooth, not roughened area.
- AA shows a section line which corresponds to the sectional view of FIG.
- the mask 1 may also have a different structure, wherein the second distances 14 are selected in such a way between adjacent mask areas, that the semiconductor layer 2 during etching of the coupling-out structure with corresponding circumferential and passing through the entire semiconductor layer 2 separating trenches 16 ver ⁇ see.
- FIG. 4 shows, in a schematic representation, a carrier 20 on which two semiconductor chips 21 have been patterned out of a semiconductor layer 2 according to the method described.
- Each semiconductor chip 21 has on a top side a central region 23 which is surrounded by an edge region 22.
- the central region 23 has the coupling-out structure in the form of a recess 15, which was introduced into the upper side of the semiconductor layer 2 with the aid of the mask and the first openings 40.
- the central region 23 is roughened with ⁇ .
- the edge region 22 was covered during the etching process by the second mask member 12 of a peripheral edge region of the etching mask and is therefore not roughened on ⁇ . As a result, the smooth edge region 22 can be optically distinguished from the roughened edge region 23.
- a sharp chip edge is optically he ⁇ known, whereby an optical control can be easily performed automatically.
- An optical control is required in ⁇ example, to check for defects or contamination.
- Each semiconductor chip 21 is surrounded by a circumferential, etched edge region 24. The edge region 24 was etched simultaneously with the coupling-out structure.
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- Led Devices (AREA)
- Drying Of Semiconductors (AREA)
- Dicing (AREA)
- Weting (AREA)
Abstract
Description
Claims
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112013004761.6T DE112013004761B4 (de) | 2012-09-27 | 2013-09-26 | Verfahren zum Vereinzeln von Bereichen einer Halbleiterschicht |
| KR1020157007470A KR20150058247A (ko) | 2012-09-27 | 2013-09-26 | 반도체 층의 영역 분리 방법 |
| CN201380050875.6A CN104685643B (zh) | 2012-09-27 | 2013-09-26 | 用于对半导体层的区域进行分割的方法 |
| US14/430,872 US9589943B2 (en) | 2012-09-27 | 2013-09-26 | Method for separating regions of a semiconductor layer |
| JP2015533577A JP6177333B2 (ja) | 2012-09-27 | 2013-09-26 | 半導体層の領域の分割方法 |
| US15/413,281 US9865776B2 (en) | 2012-09-27 | 2017-01-23 | Method for separating regions of a semiconductor layer |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012217524.5 | 2012-09-27 | ||
| DE102012217524 | 2012-09-27 | ||
| DE102012220909.3 | 2012-11-15 | ||
| DE201210220909 DE102012220909A1 (de) | 2012-09-27 | 2012-11-15 | Verfahren zum Vereinzeln von Bereichen einer Halbleiterschicht |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US14/430,872 A-371-Of-International US9589943B2 (en) | 2012-09-27 | 2013-09-26 | Method for separating regions of a semiconductor layer |
| US15/413,281 Continuation US9865776B2 (en) | 2012-09-27 | 2017-01-23 | Method for separating regions of a semiconductor layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014049038A1 true WO2014049038A1 (de) | 2014-04-03 |
Family
ID=49253298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2013/070042 Ceased WO2014049038A1 (de) | 2012-09-27 | 2013-09-26 | Verfahren zum vereinzeln von bereichen einer halbleiterschicht |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US9589943B2 (de) |
| JP (1) | JP6177333B2 (de) |
| KR (1) | KR20150058247A (de) |
| CN (2) | CN107731806A (de) |
| DE (2) | DE102012220909A1 (de) |
| WO (1) | WO2014049038A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105679756A (zh) * | 2015-11-25 | 2016-06-15 | 杭州立昂微电子股份有限公司 | 一种半导体器件顶层金属的终端结构及其制造方法 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012102114B4 (de) * | 2012-03-13 | 2021-09-16 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Strahlungsemittierendes Halbleiterbauteil, Beleuchtungsvorrichtung und Anzeigevorrichtung |
| DE102012220909A1 (de) * | 2012-09-27 | 2014-05-15 | Osram Opto Semiconductors Gmbh | Verfahren zum Vereinzeln von Bereichen einer Halbleiterschicht |
| DE102016103358A1 (de) * | 2016-02-25 | 2017-08-31 | Osram Opto Semiconductors Gmbh | Laserbarren mit gräben |
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-
2012
- 2012-11-15 DE DE201210220909 patent/DE102012220909A1/de not_active Withdrawn
-
2013
- 2013-09-26 CN CN201710946421.7A patent/CN107731806A/zh active Pending
- 2013-09-26 JP JP2015533577A patent/JP6177333B2/ja active Active
- 2013-09-26 DE DE112013004761.6T patent/DE112013004761B4/de active Active
- 2013-09-26 US US14/430,872 patent/US9589943B2/en active Active
- 2013-09-26 CN CN201380050875.6A patent/CN104685643B/zh active Active
- 2013-09-26 KR KR1020157007470A patent/KR20150058247A/ko not_active Withdrawn
- 2013-09-26 WO PCT/EP2013/070042 patent/WO2014049038A1/de not_active Ceased
-
2017
- 2017-01-23 US US15/413,281 patent/US9865776B2/en active Active
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|---|---|---|---|---|
| DE102009023355A1 (de) * | 2009-05-29 | 2010-12-02 | Osram Opto Semiconductors Gmbh | Verfahren zur Herstellung eines optoelektronischen Halbleiterbauteils |
| EP2360748A2 (de) * | 2010-02-11 | 2011-08-24 | LG Innotek Co., Ltd. | Lichtemittierende Vorrichtung und Gehäuse für lichtemittierende Vorrichtung |
| DE102011010503A1 (de) | 2011-02-07 | 2012-08-09 | Osram Opto Semiconductors Gmbh | Optoelektronischer Halbleiterchip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105679756A (zh) * | 2015-11-25 | 2016-06-15 | 杭州立昂微电子股份有限公司 | 一种半导体器件顶层金属的终端结构及其制造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107731806A (zh) | 2018-02-23 |
| KR20150058247A (ko) | 2015-05-28 |
| JP2015536044A (ja) | 2015-12-17 |
| US9865776B2 (en) | 2018-01-09 |
| DE112013004761B4 (de) | 2022-01-05 |
| DE102012220909A1 (de) | 2014-05-15 |
| CN104685643B (zh) | 2017-10-17 |
| US20170133555A1 (en) | 2017-05-11 |
| CN104685643A (zh) | 2015-06-03 |
| JP6177333B2 (ja) | 2017-08-09 |
| US20150287880A1 (en) | 2015-10-08 |
| DE112013004761A5 (de) | 2015-08-13 |
| US9589943B2 (en) | 2017-03-07 |
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