CN102064260B - Device structure of grid modulation positively-mounted structure GaN base light emitting diode and manufacturing method - Google Patents
Device structure of grid modulation positively-mounted structure GaN base light emitting diode and manufacturing method Download PDFInfo
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- CN102064260B CN102064260B CN2010105346224A CN201010534622A CN102064260B CN 102064260 B CN102064260 B CN 102064260B CN 2010105346224 A CN2010105346224 A CN 2010105346224A CN 201010534622 A CN201010534622 A CN 201010534622A CN 102064260 B CN102064260 B CN 102064260B
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- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 12
- 239000010980 sapphire Substances 0.000 claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 239000012212 insulator Substances 0.000 claims description 31
- 238000002360 preparation method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 9
- 238000004020 luminiscence type Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229910004541 SiN Inorganic materials 0.000 claims description 6
- 238000005530 etching Methods 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000001312 dry etching Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000001259 photo etching Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 230000010287 polarization Effects 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 238000005215 recombination Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000002800 charge carrier Substances 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 230000005699 Stark effect Effects 0.000 description 1
- 208000004350 Strabismus Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005428 wave function Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
A grid modulation positively-mounted structure GaN base light emitting diode structure comprises: a sapphire substrate, an n-type GaN layer, a multi-quantum well active layer, a p-type GaN layer, a P electrode, an N electrode, a grid insulating layer and a gate electrode, wherein the n-type GaN layer is manufactured on the sapphire substrate, a bottom bed is formed at one side above the n-type GaN layer, the depth of the bottom bed is less than the thickness of the n-type GaN layer; the multi-quantum well active layer is manufactured at the other side above the n-type GaN layer where no bottom bed is arranged; the p-type GaN layer is manufactured on the multi-quantum well active layer; the P electrode is manufactured at one side of the p-type GaN layer far away from the bottom bed; the N electrode is manufactured on the bottom bed above the n-type GaN layer; the grid insulating layer is manufactured at the other side of the p-type GaN layer where no p electrode is arranged; and the gate electrode is manufactured on the grid insulating layer.
Description
Technical field
The present invention is used for semiconductor photoelectronic device manufacturing technology field, is specifically related to device architecture and preparation method that a kind of novel grid is modulated the GaN based light-emitting diode.
Background technology
The GaN base semiconductor is novel broad stopband direct gap semiconductor material, has excellent physics, chemical property.Great power LED based on the InGaN quantum well structure is the focus and the related industry development tap of current semi-conductor photoelectronic research field.Current I II group-III nitride shows at colour, the decorative illumination lamp numerous areas has obtained extensive use.
The quantum well radiation structure is the prominent example that quantum physics is used at optoelectronic areas; After SQW thickness is reduced to nanometer scale; The stepped distribution of the charge carrier density of states, thus under identical injection level, realize electronics, hole-recombination more easily; Obtain Wavelength stabilized, the light emission spectrum that spectral line is narrower.Yet the III group-III nitride of pricker zinc ore structure has hexagonal crystallographic texture, and its symmetry has very strong spontaneous polarization field not as good as cube crystal phase structure; Compare with traditional G aAs system quantum well structure in addition, have bigger lattice mismatch between the InGaN/GaN system, under the effect of crystal lattice stress, cause stronger piezoelectric polarization electric field, can reach MV/cm usually, cause significant quantum limit Stark effect.Under the polarized electric field effect, conduction band electron separates with valence band hole wave function space in the SQW, and electronics, hole-recombination probability reduce, thereby reduces radiation recombination efficient.In addition, influenced by polarity effect, increase with injection current, the LED emission wavelength squints, and can reach 3-5nm usually.Drifting in the practical application of emission wavelength will produce following problem: aspect demonstration, wavelength variations will cause full color to show very difficulty of control, and the too wide meeting of spectrum simultaneously causes color impure; In the white-light illuminating field, because the variation of blue light wavelength will cause the color of white light or colour temperature to change.
Before the present invention,, utilize means such as lattice match quantum well structure or non-polar plane growth to reduce polarity effect, but effect is unsatisfactory usually through optimizing epitaxial growth.
Summary of the invention
The preparation method who the object of the present invention is to provide a kind of novel grid to modulate the device architecture of formal dress structure GaN base light emitting diode.This structure is utilized extra electric field through gate insulator medium and gate electrode, and balance InGaN/GaN system is because spontaneous polarization, polarized electric field that piezoelectric polarization produced.Reduce the influence of polarity effect, realize the modulation of gate electrode the GaN base LED characteristics of luminescence to device property.The present invention is for reducing III group-III nitride luminescent device polarity effect, and preparation is efficient, and having good consistent wavelength property GaN base LED provides a kind of effective way.
Technical scheme of the present invention is following:
The present invention provides a kind of grid modulation formal dress structure GaN base light emitting diode structure, comprising:
One Sapphire Substrate;
One n type GaN layer, this n type GaN layer is produced on the Sapphire Substrate, and the side above this n type GaN layer is formed with a table top, and the degree of depth of this table top is less than the thickness of n type GaN layer;
One multiple quantum well active layer, this multiple quantum well active layer do not have on the opposite side of table top above being produced on n type GaN layer;
One p type GaN layer, this p type GaN layer is produced on the multiple quantum well active layer;
One P electrode, this p electrode are produced on above the p type GaN layer side away from table top;
One N electrode, this N electrode are produced on the table top above the n type GaN layer;
One gate insulator, this gate insulator are produced on the opposite side that does not have the P electrode above the p type GaN layer;
One gate electrode, this electrode is produced on the gate insulator.
Wherein the material of gate insulator is SiO
2, SiN or SiON, thickness is 0.001-0.1um.
Wherein gate electrode is metal electrode or transparency conductive electrode, and this gate electrode can be realized the modulation to GaN radical luminescence diode characteristic.
The present invention provides the preparation method of a kind of grid modulation formal dress structure GaN base light emitting diode structure, comprising following steps:
Step 1: growing n-type GaN layer, multiple quantum well active layer and p type GaN layer successively on the Sapphire Substrate;
Step 2: adopt the method for dry etching, downward etching from the p type GaN layer makes the one of which side form table top, and etching depth arrives within the n type GaN layer;
Step 3: the side away from table top on p type GaN layer prepares the P electrode;
Step 4: preparation N electrode on table top;
Step 5: on p type GaN layer, do not have the opposite side of P electrode to prepare gate insulator;
Step 6:, accomplish the making of formal dress structure devices at gate insulator above-prepared gate electrode.
Wherein gate insulator is that the material of gate insulator is SiO through deposition or sputter preparation
2, SiN or SiON.
Wherein the thickness of gate insulator is 0.001-0.1um.
Wherein gate electrode is to utilize photoetching, the preparation of band glue stripping technology, and gate electrode is metal electrode or transparency conductive electrode, and this gate electrode 8 can be realized the modulation to GaN radical luminescence diode characteristic.
Wherein the thickness of p type GaN layer is 0.01-0.5um.
Description of drawings
For further specifying content of the present invention, below in conjunction with concrete execution mode the present invention is done detailed description, wherein:
Fig. 1 is the generalized section of GaN based power type LED epitaxial material, on Sapphire Substrate 1, adopts the method growth n-GaN layer 2 of extension, active layer 3, p-GaN layer 4;
Fig. 2 is the structure GaN-based LED structural representation of formal dress that utilizes epitaxial material preparation shown in Figure 1, p-GaN layer 4 surface preparation p electrode 5, table top 21 surface preparation n electrodes 6.
Fig. 3 is through deposition or sputters on the positive assembling structure led chip p-GaN layer 4 shown in Figure 2, the sketch map of preparation gate insulator 7.
Fig. 4 is the sketch map of preparation gate electrode 8 on the structure GaN-based LED gate insulator 7 of formal dress shown in Figure 2.
Embodiment
See also shown in Figure 4ly, the present invention provides a kind of grid modulation GaN based light-emitting diode structure, comprising:
One Sapphire Substrate 1;
One n type GaN layer 2, this n type GaN layer 2 is produced on the Sapphire Substrate 1, and the side above this n type GaN layer 2 is formed with a table top 21, and the degree of depth of this table top 21 is less than the thickness of n type GaN layer 2;
One multiple quantum well active layer 3, this multiple quantum well active layer 3 do not have on the opposite side of table top 21 above being produced on n type GaN layer 2, and this layer structure can play restriction to injecting charge carrier, inject charge carrier can be in this one deck recombination luminescence;
One p type GaN layer 4, this p type GaN layer 4 is produced on the multiple quantum well active layer 3, and the thickness of this p type GaN layer 4 is 0.01-0.5um;
One P electrode 5, this p electrode 5 are produced on p type GaN layer 4 a top side away from table top 21;
One N electrode 6, this N electrode 6 are produced on the table top 21 above the n type GaN layer 2;
One gate insulator 7, this gate insulator 7 are produced on the opposite side that does not have P electrode 5 above the p type GaN layer 4, and the material of this gate insulator 7 is SiO
2, SiN or SiON, the thickness of this gate insulator 7 is 0.001-0.1um, through this layer structure, utilizes extra electric field, balance InGaN/GaN system is because spontaneous polarization, polarized electric field that piezoelectric polarization produced.Reduce the influence of polarity effect, realize the modulation of gate electrode, comprise the modulation of emission wavelength, the modulation of luminous intensity etc. the GaN base LED characteristics of luminescence to device property;
One gate electrode 8, this electrode 8 is produced on the gate insulator 7, and this gate electrode 8 is metal electrode or transparency conductive electrode.
See also Fig. 1 to shown in Figure 4, the present invention provides a kind of preparation method of grid modulation GaN based light-emitting diode structure, comprising following steps:
Step 1: growing n-type GaN layer 2, multiple quantum well active layer 3 and p type GaN layer 4 successively on the Sapphire Substrate 1, the thickness of this p type GaN layer 4 is 0.01-0.5um;
Step 2: adopt the method for dry etching, etching downwards from the p type GaN layer 4 makes the one of which side form table top 21, and etching depth arrives within the n type GaN layer 2;
Step 3: the side away from table top 21 on p type GaN layer 4 prepares P electrode 5, and its electrode metal system is that transparency conductive electrode adds NiAgNiAu, NiAgPtAu, NiAgNiAu etc.;
Step 4: preparation N electrode 6 on table top 21;
Step 5: on p type GaN layer 4, do not have the opposite side of P electrode 5 to prepare gate insulator 7, this gate insulator 7 is that the material of gate insulator 7 is SiO through deposition or sputter preparation
2, SiN or SiON, the thickness of this gate insulator 7 is 0.001-0.1um;
Step 6: at gate insulator 7 above-prepared gate electrodes 8; This gate electrode 8 is to utilize photoetching, the preparation of band glue stripping technology; Gate electrode 8 is metal electrode or transparency conductive electrode; Through this gate electrode 8 is applied voltage signal, realize modulation to GaN radical luminescence diode characteristic, accomplish the making of grid modulation formal dress structure devices.
The above; Be merely the embodiment among the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The conversion that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. a grid is modulated formal dress structure GaN base light emitting diode structure, comprising:
One Sapphire Substrate;
One n type GaN layer, this n type GaN layer is produced on the Sapphire Substrate, and the side above this n type GaN layer is formed with a table top, and the degree of depth of this table top is less than the thickness of n type GaN layer;
One multiple quantum well active layer, this multiple quantum well active layer do not have on the opposite side of table top above being produced on n type GaN layer;
One p type GaN layer, this p type GaN layer is produced on the multiple quantum well active layer;
One P electrode, this p electrode are produced on above the p type GaN layer side away from table top;
One N electrode, this N electrode are produced on the table top above the n type GaN layer;
One gate insulator, this gate insulator are produced on the opposite side that does not have the P electrode above the p type GaN layer;
One gate electrode, this electrode is produced on the gate insulator.
2. grid modulation formal dress structure GaN base light emitting diode structure according to claim 1, wherein the material of gate insulator is SiO
2, SiN or SiON, thickness is 0.001-0.1 μ m.
3. grid modulation formal dress structure GaN base light emitting diode structure according to claim 1, wherein gate electrode is metal electrode or transparency conductive electrode, this gate electrode can be realized the modulation to GaN radical luminescence diode characteristic.
4. the preparation method of grid modulation formal dress structure GaN base light emitting diode structure, comprising following steps:
Step 1: growing n-type GaN layer, multiple quantum well active layer and p type GaN layer successively on the Sapphire Substrate;
Step 2: adopt the method for dry etching, downward etching from the p type GaN layer makes the one of which side form table top, and etching depth arrives within the n type GaN layer;
Step 3: the side away from table top on p type GaN layer prepares the P electrode;
Step 4: preparation N electrode on table top;
Step 5: on p type GaN layer, do not have the opposite side of P electrode to prepare gate insulator;
Step 6:, accomplish the making of formal dress structure devices at gate insulator above-prepared gate electrode.
5. the manufacture method of grid modulation formal dress structure GaN base light emitting diode structure according to claim 4, wherein gate insulator is that the material of gate insulator is SiO through deposition or sputter preparation
2, SiN or SiON.
6. the manufacture method of grid modulation formal dress structure GaN base light emitting diode structure according to claim 4, wherein the thickness of gate insulator is 0.001-0.1 μ m.
7. the manufacture method of grid modulation formal dress structure GaN base light emitting diode structure according to claim 4; Wherein gate electrode is to utilize photoetching, the preparation of band glue stripping technology; Gate electrode is metal electrode or transparency conductive electrode, and this gate electrode 8 can be realized the modulation to GaN radical luminescence diode characteristic.
8. the manufacture method of grid modulation formal dress structure GaN base light emitting diode structure according to claim 4, wherein the thickness of p type GaN layer is 0.01-0.5 μ m.
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| CN105702816B (en) * | 2016-04-22 | 2018-03-30 | 河北工业大学 | A kind of preparation method of iii-nitride light emitting devices chip |
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