CN110459656B - 紫外led外延片及其制备方法 - Google Patents

紫外led外延片及其制备方法 Download PDF

Info

Publication number
CN110459656B
CN110459656B CN201910761882.6A CN201910761882A CN110459656B CN 110459656 B CN110459656 B CN 110459656B CN 201910761882 A CN201910761882 A CN 201910761882A CN 110459656 B CN110459656 B CN 110459656B
Authority
CN
China
Prior art keywords
layer
gan
current expansion
intermediate layer
ultraviolet led
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.)
Active
Application number
CN201910761882.6A
Other languages
English (en)
Other versions
CN110459656A (zh
Inventor
付羿
刘卫
刘乐功
彭翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jingneng Optoelectronics Co ltd
Original Assignee
Lattice Power Jiangxi Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lattice Power Jiangxi Corp filed Critical Lattice Power Jiangxi Corp
Priority to CN201910761882.6A priority Critical patent/CN110459656B/zh
Publication of CN110459656A publication Critical patent/CN110459656A/zh
Application granted granted Critical
Publication of CN110459656B publication Critical patent/CN110459656B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/005Processes
    • H01L33/0062Processes for devices with an active region comprising only III-V compounds
    • H01L33/0066Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound
    • H01L33/007Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound comprising nitride compounds
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02Semiconductor devices having potential barriers 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
    • H01L33/12Semiconductor devices having potential barriers 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 with a stress relaxation structure, e.g. buffer layer
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02Semiconductor devices having potential barriers 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
    • H01L33/14Semiconductor devices having potential barriers 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 with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02Semiconductor devices having potential barriers 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
    • H01L33/20Semiconductor devices having potential barriers 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 with a particular shape, e.g. curved or truncated substrate

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Led Devices (AREA)

Abstract

本发明提供了一种紫外LED外延片及其制备方法,其中,紫外LED外延片中包括:生长衬底、低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层,低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层依次生长于生长衬底表面,其中,图形中间层由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间。可有效减小紫外LED外延结构中n型AlGaN电流扩展层受到的张应力,避免外延层中的裂纹;及降低n型AlGaN电流扩展层中的晶体缺陷密度,提高紫外LED光效和可靠性。

Description

紫外LED外延片及其制备方法
技术领域
本发明涉及LED技术领域,尤其是一种紫外LED外延片及其制备方法。
背景技术
在波长短于385nm的(Al)GaN基紫外LED结构中,通常会使用n型AlGaN层替代n型GaN作为n型电流扩展层,以减少对有源区发射紫外光子的吸收。但是,由于Al原子的表面迁移率很低,在衬底上直接生长n型AlGaN比较困难,会导致高密度的晶体缺陷,制约紫外LED的发光效率和可靠性。
为了减少紫外LED中n型AlGaN层的晶体缺陷,一般会在衬底上先生长一层低缺陷密度的GaN,之后再生长n型AlGaN电流扩展层。但由于晶格常数差异,AlGaN在GaN上会受到较大的张应力,很容易产生高密度的破坏性裂纹。另外,在波长短于385nm的(Al)GaN基紫外LED芯片的制程中,需要完全去掉n型AlGaN电流扩展层之前的GaN外延层以消除GaN对紫外光的强烈吸收。由于外延片内和外延片间的厚度并不均匀,设定刻蚀深度的传统方法并不能保证GaN外延层被刻蚀完全。
发明内容
为了克服以上不足,本发明提供了一种紫外LED外延片及其制备方法,有效缓解现有紫外LED外延片中出现的压应力较大等技术问题。
本发明提供的技术方案为:
一种紫外LED外延片,包括:生长衬底、低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层,所述低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层依次生长于所述生长衬底表面,其中,图形中间层由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间。
本发明还提供了一种紫外LED外延片制备方法,包括:
S1在MOCVD系统中,在生长衬底表面生长低缺陷密度GaN层;
S2将生长有低缺陷密度GaN层的生长衬底从MOCVD系统中降温取出,采用光刻工艺在所述低缺陷密度GaN层上制备图形中间层;所述图形中间层由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间;
S3将表面制备有低缺陷密度GaN层和图形中间层的生长衬底放入MOCVD系统中,在高温、低压、高V/III比的外延横向生长条件下生长n型电流扩展层,同时保持图形中间层的条形柱子之间的中空结构,而后在n型AlGaN电流扩展层上依次生长有源区发光层及p型电流扩展层,完成紫外LED外延片的制备。
在本发明提供的紫外LED外延片中,在生长衬底上生长一层低缺陷密度GaN层后在该GaN层上制作微米尺寸的图形中间层;之后,利用外延横向生长技术在GaN条状图形(图形中间层)上生长平整的n型AlGaN电流扩展层、有源区发光层及p型电流扩展层。可有效减小紫外LED外延结构中n型AlGaN电流扩展层受到的张应力,避免外延层中的裂纹;及降低n型AlGaN电流扩展层中的晶体缺陷密度,提高紫外LED光效和可靠性。再有,在后续的芯片制程粗化工艺中,相比于没有图形中间层的结构,腐蚀液对图形中间层沟槽的横向钻蚀可以更加精准的完全去除GaN层,并同时在芯片表面产生粗化形貌。
附图说明
图1为本发明中紫外LED外延片结构示意图;
图2~4为本发明中紫外LED外延片制备流程图。
附图标记:
1-生长衬底,2-低缺陷密度GaN层,3-图形中间层,4-n型AlGaN电流扩展层,5-有源区发光层,6-p型电流扩展层。
具体实施方式
为了更清楚地说明本发明实施案例或现有技术中的技术方案,下面将对照附图说明本发明的具体实施方式。显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图,并获得其他的实施方式。
如图1所示为本发明提供的紫外LED外延片结构示意图,包括:生长衬底1、低缺陷密度GaN层2、图形中间层3、n型AlGaN电流扩展层4、有源区发光层5(InGaN/AlGaN多量子阱结构)及p型电流扩展层6(AlGaN层),低缺陷密度GaN层2、图形中间层3、n型AlGaN电流扩展层4、有源区发光层5及p型电流扩展层6依次生长于生长衬底表面,其中,图形中间层3由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间。
在生长过程中,首先,在MOCVD系统中,在生长衬底表面生长厚度在1000~1500nm之间的低缺陷密度GaN层,如图2所示;之后,将外延片从MOCVD系统中降温取出,采用光刻工艺在低缺陷密度GaN层上制备图形中间层(蚀刻低缺陷密度GaN层得到),其中,图形中间层厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间,如图3所示;接着,将制有图形中间层的外延片放入MOCVD系统中,在图形中间层表面继续生长n型AlGaN电流扩展层、有源区发光层及p型电流扩展层,完成紫外LED外延片的制备,如图4所示。
以下通过一实例对紫外LED外延片的制备过程进行进一步说明:
首先,将蓝宝石衬底放置到MOCVD反应室中,将反应室温度设定在800~1200℃,往反应室中通入三甲基镓(TMGa)、氨气(NH3),在H2作为载气的条件下生长厚度为1200nm的低缺陷密度GaN层。
接着,将MOCVD设备降温后取出外延片,并用BOE清洗液对外延片表面进行清洗;之后,使用光刻胶在外延片表面制备高度为2μm、宽度为10μm的条状图形,且条状图形之间的间隔为10μm。接着,对低缺陷密度GaN层进行ICP刻蚀,得到高度为1.5μm、宽度为10μm、间隔为10μm的GAN条状图形,完成图形中间层的制备。
接着,将光刻后的外延片放回MOCVD设备,将反应时温度设定在1100℃左右,气压设定在70torr,往反应室中通入三甲基镓(TMGa)、三甲基铝(TMAl)及氨气(NH3),以硅烷(SiH4)作为掺杂剂,掺杂浓度为8×1018cm-3,生长n型电流扩展层,生长出来的n型电流扩展层为Al组分7%的n型Al0.07Ga0.93N层,厚度3000nm。
之后,以氮气(N2)作为载气,在800℃下生长In0.02Ga0.98N量子阱层,升温到950℃,生长Al0.15Ga0.85N势垒层,重复生长7对制备得到有源发光层。具体,有源发光层为7对In0.02Ga0.98N/Al0.15Ga0.85N(3nm/15nm)多量子阱结构,发光波长约为365nm,属于近紫外波段。Al0.15Ga0.85N势垒层中硅掺杂浓度为2×1018cm-3,In0.02Ga0.98N量子阱层为非故意掺杂。
最后,以H2或者N2作为载气,通入TMAl、TMGa及NH3,且以二茂镁(Cp2Mg)作为掺杂剂在外延生长温度为900℃~1000℃的条件下生长p型电流扩展层5,厚度为80nm。
应当说明的是,上述实施例均可根据需要自由组合。以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。

Claims (2)

1.一种紫外LED外延片,其特征在于,包括:生长衬底、低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层,所述低缺陷密度GaN层、图形中间层、n型AlGaN电流扩展层、有源区发光层及p型电流扩展层依次生长于所述生长衬底表面,其中,图形中间层由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间;n型AlGaN电流扩展层横向生长在图形中间层上,图形中间层保持GaN条状图形之间的中空结构;
所述低缺陷密度GaN层的厚度在1000~1500nm之间。
2.一种紫外LED外延片制备方法,其特征在于,包括:
S1 在MOCVD系统中,在生长衬底表面生长低缺陷密度GaN层;
S2 将生长有低缺陷密度GaN层的生长衬底从MOCVD系统中降温取出,采用光刻工艺在所述低缺陷密度GaN层上制备图形中间层;所述图形中间层由GaN条状图形组成,厚度在1000~1500nm之间,宽度在1~10μm,相邻条状图形之间的间隔在1~10μm之间;
S3 将表面制备有低缺陷密度GaN层和图形中间层的生长衬底放入MOCVD系统中,在所述图形中间层表面依次生长n型AlGaN电流扩展层、有源区发光层及p型电流扩展层,完成紫外LED外延片的制备;n型AlGaN电流扩展层横向生长在图形中间层上,图形中间层保持GaN条状图形之间的中空结构;
在步骤S1中,所述低缺陷密度GaN层的厚度在1000~1500nm之间。
CN201910761882.6A 2019-08-19 2019-08-19 紫外led外延片及其制备方法 Active CN110459656B (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910761882.6A CN110459656B (zh) 2019-08-19 2019-08-19 紫外led外延片及其制备方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910761882.6A CN110459656B (zh) 2019-08-19 2019-08-19 紫外led外延片及其制备方法

Publications (2)

Publication Number Publication Date
CN110459656A CN110459656A (zh) 2019-11-15
CN110459656B true CN110459656B (zh) 2023-02-24

Family

ID=68487419

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910761882.6A Active CN110459656B (zh) 2019-08-19 2019-08-19 紫外led外延片及其制备方法

Country Status (1)

Country Link
CN (1) CN110459656B (zh)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006128527A (ja) * 2004-11-01 2006-05-18 Osaka Gas Co Ltd GaN系化合物半導体の製造方法
CN104505444A (zh) * 2014-12-09 2015-04-08 西安神光安瑞光电科技有限公司 一种减少外延层缺陷密度的外延生长方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4571476B2 (ja) * 2004-10-18 2010-10-27 ローム株式会社 半導体装置の製造方法
JP5084837B2 (ja) * 2006-10-18 2012-11-28 ナイテック インコーポレイテッド 深紫外線発光素子及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006128527A (ja) * 2004-11-01 2006-05-18 Osaka Gas Co Ltd GaN系化合物半導体の製造方法
CN104505444A (zh) * 2014-12-09 2015-04-08 西安神光安瑞光电科技有限公司 一种减少外延层缺陷密度的外延生长方法

Also Published As

Publication number Publication date
CN110459656A (zh) 2019-11-15

Similar Documents

Publication Publication Date Title
JP3219854U (ja) Iii−v族窒化物半導体エピタキシャルウエハ及びiii−v族窒化物半導体デバイス
KR101399250B1 (ko) 질소 화합물 반도체 발광 소자 및 그 제조 방법
KR100668351B1 (ko) 질화물계 발광소자 및 그 제조방법
JP4055304B2 (ja) 窒化ガリウム系化合物半導体の製造方法
JP5932664B2 (ja) Iii族窒化物半導体デバイス及びその製造方法
KR100809229B1 (ko) 질화물 반도체 발광 소자 및 제조방법
CN111725371B (zh) 一种led外延底层结构及其生长方法
CN112331748A (zh) 一种发光二极管的外延结构及其制备方法
CN110459656B (zh) 紫外led外延片及其制备方法
CN106887487B (zh) 一种半导体发光器件及其制备方法
CN114373837A (zh) 一种AlGaN基深紫外发光二极管器件结构及其制备方法
CN103855264A (zh) 单晶氮化镓基板及其制造方法
JP4548117B2 (ja) 半導体発光素子の製造方法、集積型半導体発光装置の製造方法、画像表示装置の製造方法および照明装置の製造方法
JP4140595B2 (ja) 窒化ガリウム系化合物半導体
CN111129243A (zh) GaN基紫外LED外延结构
JP5190343B2 (ja) 半導体素子の製造方法
CN214625075U (zh) 氮化物半导体元件
CN111048637B (zh) 高落差台阶结构的多色led外延芯片及其制备方法
JP4055763B2 (ja) 窒化ガリウム系化合物半導体及び半導体基板
CN219998246U (zh) 一种Micro-LED的器件结构
CN102347410B (zh) 一种提高GaN基LED亮度的方法
KR101012638B1 (ko) 수직형 질화물계 발광소자의 제조방법
KR100616631B1 (ko) 질화물계 반도체 발광 소자 및 그 제조 방법
JP2005020027A (ja) 窒化ガリウム系化合物半導体の製造方法
JP3613190B2 (ja) 窒化ガリウム系化合物半導体発光素子及びその製造方法

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 330096 No. 699, Aixi Hubei Road, Nanchang High-tech Development Zone, Jiangxi Province

Patentee after: Jingneng optoelectronics Co.,Ltd.

Address before: 330096 No. 699, Aixi Hubei Road, Nanchang High-tech Development Zone, Jiangxi Province

Patentee before: LATTICE POWER (JIANGXI) Corp.

CP01 Change in the name or title of a patent holder