CN110783434B - LED chip and preparation method thereof - Google Patents
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- CN110783434B CN110783434B CN201911125980.7A CN201911125980A CN110783434B CN 110783434 B CN110783434 B CN 110783434B CN 201911125980 A CN201911125980 A CN 201911125980A CN 110783434 B CN110783434 B CN 110783434B
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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
- H10H20/813—Bodies having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
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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]
- H10H20/01—Manufacture or treatment
- H10H20/011—Manufacture or treatment of bodies, e.g. forming semiconductor layers
- H10H20/013—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials
- H10H20/0133—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials
- H10H20/01335—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials the light-emitting regions comprising nitride materials
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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
- H10H20/811—Bodies having quantum effect structures or superlattices, e.g. tunnel junctions
- H10H20/812—Bodies having quantum effect structures or superlattices, e.g. tunnel junctions within the light-emitting regions, e.g. having quantum confinement structures
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Abstract
The invention relates to an LED chip and a preparation method thereof.A first nanorod area and a second nanorod area which are composed of nanorods penetrating through an n-type material layer, a multi-quantum well layer and a p-type material layer in sequence are formed on the LED chip. The LED chip is provided with the first nanorod area and the second nanorod area, the diameter change of the nanorods can change the light emitting wavelength of a multi-quantum well layer in the nanorods by combining experimental data, the diameter of the nanorods in the first nanorod area is larger than that of the nanorods in the second nanorod area, so that the first nanorod area and the second nanorod area can respectively emit light with different wavelengths, and the LED chip can realize colorful display.
Description
Technical Field
The invention relates to the technical field of display, in particular to an LED chip and a preparation method thereof.
Background
micro-LED is an LED device that can be used for screen display, and realizes illumination and display by emitting light through a single LED chip.
However, due to the property of the LED device emitting monochromatic light, in order to realize a multicolor display, a plurality of LED chips emitting different colors are required to be combined.
That is, a single LED chip cannot realize a multicolor display.
Disclosure of Invention
In view of this, it is necessary to provide an LED chip that can emit two or more kinds of light, thereby realizing a multicolor display.
An LED chip comprises a base layer, a first metal layer, a p-type material layer, a multi-quantum well layer, an n-type material layer and a second metal layer which are sequentially stacked;
and a first nanorod area and a second nanorod area which are formed by nanorods penetrating through the n-type material layer, the multi-quantum well layer and the p-type material layer in sequence are formed on the LED chip, and the diameter of the nanorod in the first nanorod area is larger than that of the nanorod in the second nanorod area.
A preparation method of an LED chip is used for preparing the LED chip and comprises the following steps:
providing an LED wafer, wherein the LED wafer comprises a p-type material layer, a multi-quantum well layer, an n-type material layer and a substrate which are sequentially stacked;
forming a first metal layer on the p-type material layer, and then disposing a base layer on the first metal layer such that the base layer, the first metal layer, and the p-type material layer are sequentially stacked;
removing the substrate, and then carrying out primary flattening treatment on the n-type material layer;
forming a mask layer with a required pattern on the n-type material layer, and then etching to form a first nanorod area and a second nanorod area, wherein the first nanorod area and the second nanorod area are respectively composed of nanorods penetrating through the n-type material layer, the multi-quantum well layer and the p-type material layer in sequence, and the diameter of the nanorods in the first nanorod area is larger than that of the nanorods in the second nanorod area; and
and performing secondary flattening treatment on the n-type material layer to obtain a semi-finished product, and forming a second electrode layer on the n-type material layer to obtain the LED chip.
The LED chip is provided with the first nanorod area and the second nanorod area, the diameter change of the nanorods can change the light emitting wavelength of a multi-quantum well layer in the nanorods by combining experimental data, and the diameters of the nanorods in the first nanorod area and the second nanorod area are larger than those of the nanorods in the second nanorod area, so that the first nanorod area and the second nanorod area can respectively emit light with different wavelengths, and the single LED chip can realize colorful display.
In addition, compared with the traditional LED which emits light with different colors, the LED chip can simultaneously emit more than two kinds of light through the first nano-pillar region and the second nano-pillar region, so that the display resolution and the color rendering index CRI (which can reach 100) of a device adopting the LED chip are obviously superior to those of the traditional device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
fig. 1 is a schematic cross-sectional structure diagram of an LED chip according to an embodiment.
Fig. 2 is a process diagram for manufacturing the LED chip shown in fig. 1.
Fig. 3 is a photoluminescence spectrum of a white left region, a first nanopillar region, a second nanopillar region, a third nanopillar region, and a fourth nanopillar region of the LED chip prepared in example 1.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The LED chip according to the embodiment shown in fig. 1 includes a base layer 10, a first metal layer 20, a p-type material layer 30, a multiple quantum well layer 40, an n-type material layer 50, and a second metal layer 60, which are sequentially stacked.
Referring to fig. 1, a first nanopillar region 101 and a second nanopillar region 102 composed of nanopillars sequentially penetrating through the n-type material layer 50, the multiple quantum well layer 40, and the p-type material layer 30 are formed on the LED chip, and the diameter of the nanopillars in the first nanopillar region 101 is greater than that of the nanopillars in the second nanopillar region 102.
Referring to fig. 1, the first nanopillar region 101 may be provided with a plurality of nanopillars spaced apart from each other, or may be provided with only one nanopillar, each of which includes, from top to bottom, an n-type material layer 50, a multiple quantum well layer 40, and a p-type material layer 30.
Likewise, the second nanopillar region 102 may be provided with a plurality of nanopillars spaced apart from each other, or may be provided with only one nanopillar, each of which includes, from top to bottom, the n-type material layer 50, the multiple quantum well layer 40, and the p-type material layer 30.
In combination with experimental data, we found that the diameter of the nanopillar can be changed to change the light emission wavelength of the mqw layer in the nanopillar, and generally, as the diameter of the nanopillar is reduced, the light emission wavelength of the mqw layer in the nanopillar is also reduced.
In addition, compared with the traditional LED which emits light with different colors, the LED chip can simultaneously emit more than two kinds of light through the first nano-pillar region and the second nano-pillar region, so that the display resolution and the color rendering index CRI (which can reach 100) of a device adopting the LED chip are obviously superior to those of the traditional device.
In the LED chip disclosed in the present application, the diameter of the nanopillar in the first nanopillar region 101 is greater than the diameter of the nanopillar in the second nanopillar region 102, so that the first nanopillar region 101 and the second nanopillar region 102 can emit light with different wavelengths respectively, thereby enabling the LED chip to realize colorful display.
Preferably, each of the first nanorod region 101 and the second nanorod region 102 is a triangle or a hexagon (hexagon) formed by a plurality of nanorods. By adopting a triangular or hexagonal structure, the adjacent regions can be closely arranged, and the active area of the multiple quantum well layer 40 can be saved to the maximum extent.
In other embodiments, the first nanopillar region 101 and the second nanopillar region 102 may have other shapes such as a circle, a quadrangle, and a pentagon formed by a plurality of nanopillars.
The first nanopillar region 101 described in the present application has a hexagonal shape or the like, and means a shape of the first nanopillar region 101 in a plan view.
Preferably, the diameter of the nanopillar in the first nanopillar region 101 is 100nm to 1500nm, and the diameter of the nanopillar in the second nanopillar region 102 is 10nm to 800 nm.
Specifically, a white space may be further disposed on the LED chip, and no nano-pillars are formed in the white space, so that the white space may emit light of a third color.
The white light leaving area, the first nano-column area and the second nano-column area respectively emit light of three different colors, and the LED chip can emit light of three colors of red, yellow and blue after proper adjustment, so that three primary colors of light are formed, and the LED chip can realize full-color light emission.
Compared with the traditional full-color micro-display scheme, the LED chip has the following advantages: 1) the nano-pillars can relieve stress, improve light extraction efficiency and meet the requirement of high resolution of small pixels of the LED chip; 2) the LED color-changing material realizes full color on a single LED chip, does not depend on an external luminescent material or an optical component, has stable and uniform color and small volume, and is easy to integrate; 3) the large-scale micro-nano processing with low cost can be carried out by adopting nano-imprinting, so that the full-color LED micro display array scheme has the potential of practical application.
Preferably, the emission wavelength of the multiple quantum well layer is 560nm to 770 nm. Because the nano-pillars can shorten the light-emitting wavelength of the multi-quantum well, the multi-quantum well (red light, orange light and yellow light) with longer light-emitting wavelength is generally selected, so that the nano-pillars have better adjusting space.
In this embodiment, the p-type material layer 30 is a p-GaN layer, the n-type material layer 50 is an n-GaN layer, and the multi-quantum well layer 40 is a multi-quantum well layer (preferably, stacked six times) having InGaN/GaN as a stacked unit.
In other embodiments, other types of multiple quantum wells may be employed.
When the MQW 40 is a MQW having InGaN/GaN as a laminated unit, the number of times of lamination may be 3 to 20.
In the present application, the only standard for selecting the multiple quantum well layer 40 is the light emission wavelength thereof, and the parameters of the multiple quantum well layer 40, such as specific materials, doping ratios, stacking units, and stacking times, can be randomly matched, and only light with the light emission wavelength required by people needs to be emitted.
In this embodiment, the base layer 10 is a silica base layer, the first metal layer 20 is Ni/Au or Ni/Ag, and the material of the second metal layer 60 is Ti/Al. Here, "/" represents the meaning of lamination.
With reference to fig. 2, the present application further discloses a method for manufacturing the LED chip, which includes the following steps:
and S10, providing an LED wafer.
Referring to fig. 2a, the LED die includes a p-type material layer 30, a multiple quantum well layer 40, an n-type material layer 50, and a substrate 200, which are sequentially stacked.
The LED dies are usually purchased directly, and only the LED dies meeting the requirement of the light emission wavelength need to be purchased.
S20, the first metal layer 20 is formed on the p-type material layer 30, and then the base layer 10 is disposed on the first metal layer 20, such that the base layer 10, the first metal layer, and the p-type material layer 30 are sequentially stacked.
Referring to fig. 2b and 2c, the first metal layer 20 is typically formed by electron beam evaporation.
The first metal layer 20 is generally made of a metal material selected to have a high reflectivity so that the first metal layer 20 functions as a reflective layer.
The operation of disposing the base layer 10 on the first metal layer 20 may be: SiO by silica gel2The substrate (base layer 10) and the first metal layer 20 are bonded together.
S30, the substrate 200 is removed, and then the first planarization process is performed on the n-type material layer 50.
In this embodiment, the substrate 200 is a sapphire substrate. Removing the substrate 200 operates as: the substrate 200 is removed by a laser lift-off technique (LLO) in which a laser beam used in the laser lift-off technique is a deep ultraviolet laser beam having a wavelength of 266 nm.
The removal of the substrate 200 by laser lift-off (LLO) can avoid crosstalk effects and improve the heat dissipation capability of the LED chip and the current density of each pixel unit.
The laser beam adopted in the laser lift-off technology is a deep ultraviolet laser beam with the wavelength of 266nm to penetrate through the sapphire substrate and be strongly absorbed by the n-GaN layer, so that the interface between the n-GaN layer and the sapphire substrate is ablated.
In other embodiments, the substrate 200 may also be a silicon substrate, and the removing the substrate 200 is performed by: the substrate 200 is removed by wet etching.
In this embodiment, the first leveling process is performed on the n-type material layer by: and thinning the n-type material layer 50 by adopting dry etching, and enabling the surface roughness of the thinned n-type material layer 50 to be less than 10 nm.
After LLO removal of the substrate 200, the n-GaN interface becomes very rough, but excellent surface flatness is necessary for the nanoimprint process. By researching the influence of ICP parameters on the surface Roughness (RMS) and adopting dry etching to thin the n-type material layer, the surface Roughness (RMS) can be reduced to 10 nm. In addition, in order to further restore the smoothness of the etched surface to a level close to that of epitaxial growth, further reduction of RMS using chemical treatment and annealing treatment is required.
S40, a mask layer 300 having a desired pattern is formed on the n-type material layer 50, followed by etching to form the first nanopillar region 101 and the second nanopillar region 102.
Referring to fig. 2f, 2g and 2h, the first and second nanopillar regions 101 and 102 are composed of nanopillars sequentially penetrating the n-type material layer 50, the multiple quantum well layer 40 and the p-type material layer 30, and the diameter of the nanopillars in the first nanopillar region 101 is greater than that of the nanopillars in the second nanopillar region 102.
In this embodiment, the mask layer 300 is a photoresist layer 300.
In this embodiment, the operation of forming a mask layer having a desired pattern on the n-type material layer 50 after the first planarization process is: a photoresist layer 300 is formed by coating a photoresist on the n-type material layer 50, and then a desired pattern is transferred onto the photoresist layer 300 using a nano-imprinting method.
In other embodiments, the operation of forming a mask layer with a desired pattern on the n-type material layer 50 after the first planarization process is further performed by: a Ni etch mask is provided on the n-type material layer 50, followed by SiO deposition on the Ni etch mask2Layer for transferring a desired pattern to SiO by nanoimprint2Layer, followed by etching to remove the desired pattern from SiO2The layer is transferred to a Ni etch mask to obtain sidewall-vertical nanopillars by high etch selectivity between the Ni etch mask and the n-type material layer. The scheme can ensure that the etched nano-pillars are vertical and have smooth profiles.
S50, performing a second planarization process on the n-type material layer 50 to obtain a semi-finished product, and forming a second electrode layer 60 on the n-type material layer 50 to obtain the desired LED chip.
Referring to fig. 2i, the second electrode layer 60 is generally formed by electron beam evaporation.
Preferably, the second planarization process is performed on the n-type material layer 50 by: and filling a dielectric material in the first nano-pillar region 101 and the second nano-pillar region 102, and performing thinning treatment to expose the n-type material layer. The dielectric material may be a polyimide glass material. The filling dielectric material may fill the gap between the first nano-pillar region 101 and the second nano-pillar region 102, facilitating the preparation of the second electrode layer 60.
Preferably, the operation of forming the second electrode layer 60 on the semi-finished n-type material layer 50 is: after the semi-finished product is mounted obliquely, a second electrode layer 60 is formed on the n-type material layer 50 by evaporation.
The semi-finished product is installed obliquely, so that the metal electron beam can fill the gap obliquely in the evaporation process.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
The InGaN/GaNLED wafer with the luminous wavelength of 585nm (yellow light) is provided, and comprises a p-GaN layer, a multi-quantum well layer, an n-GaN layer and a sapphire substrate which are sequentially stacked, wherein the multi-quantum well layer is provided with six InGaN/GaN multi-quantum well layers.
A Ni layer (5nm)/Au layer (5nm) was vapor-deposited on p-GaN, followed by deposition of SiO through a silica gel2The substrate and the Ag layer are bonded together.
The substrate 200 is removed by laser lift-off (LLO) technology, and then the n-GaN is thinned by dry etching, so that the surface roughness of the thinned n-GaN is 10 nm.
And coating photoresist on the n-GaN to form a photoresist layer, transferring a required pattern to the photoresist layer by adopting a nano-imprinting method, and etching to form a blank area, a first nano-pillar area, a second nano-pillar area, a third nano-pillar area and a fourth nano-pillar area. The left white area is not provided with the nano-columns, the diameter of the nano-columns in the first nano-column area is 1000nm, the diameter of the nano-columns in the second nano-column area is 500nm, the diameter of the nano-columns in the third nano-column area is 100nm, and the diameter of the nano-columns in the fourth nano-column area is 80 nm.
And performing secondary flattening treatment on the n-GaN by adopting dry etching again, and then forming a Ti layer (50nm)/Al layer (150nm) on the n-GaN to obtain the required LED chip.
Example 2
Photoluminescence measurement was performed on the LED chip prepared in example 1, and photoluminescence spectrograms of a margin region, a first nanopillar region, a second nanopillar region, a third nanopillar region, and a fourth nanopillar region of the LED chip shown in fig. 3 were obtained.
As can be seen from fig. 3, the emission wavelength of the multiple quantum well in the form of the nanopillar is decreased, and as the size of the nanopillar is decreased, the emission wavelength of the multiple quantum well in the nanopillar is decreased.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
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| CN112216711B (en) * | 2020-09-15 | 2023-12-22 | 深圳远芯光路科技有限公司 | GaN light sensing biological sensing chip and preparation method and application thereof |
| CN112563302B (en) * | 2021-03-01 | 2021-05-11 | 南京邮电大学 | Micro-nano composite structure photonic integrated chip and preparation method thereof |
| CN113937194B (en) * | 2021-09-29 | 2022-09-09 | 深圳市思坦科技有限公司 | Bonding process of nano-pillar LED chip, LED chip and display device |
| CN119008821A (en) * | 2023-05-22 | 2024-11-22 | 中国科学院苏州纳米技术与纳米仿生研究所 | Micro-LED chip and preparation method and application thereof |
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| CN106784194A (en) * | 2017-01-06 | 2017-05-31 | 上海应用技术大学 | A kind of method for preparing single-chip ultra wide band white light LEDs |
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