CN105957934A - 一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片及制备方法 - Google Patents

一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片及制备方法 Download PDF

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CN105957934A
CN105957934A CN201610263454.7A CN201610263454A CN105957934A CN 105957934 A CN105957934 A CN 105957934A CN 201610263454 A CN201610263454 A CN 201610263454A CN 105957934 A CN105957934 A CN 105957934A
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张源涛
李鹏翀
杜国同
闫龙
韩煦
董鑫
张宝林
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Shanghai Jiadan Electronic Information Co ltd
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Abstract

一种n‑SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片及其制备方法,属于半导体发光器件领域。其依次由下电极层、n‑SiC衬底、n‑Alx0Ga1‑x0N导电缓冲层、n‑AlGaN基DBR下反射层、n‑Alx1Ga1‑x1N电流扩展层、AlGaN基极化诱导隧道结、p‑Alx2Ga1‑x2N空穴注入层、AlGaN基量子阱有源区、n‑Alx3Ga1‑x3N电子注入层、n‑AlGaN基DBR上反射层和上电极层构成,0.1≤x0、x1、x2、x3≤0.9。采用与AlGaN晶格更匹配的SiC衬底,改善AlGaN质量,提高内量子效率;利用谐振腔结构,增强TE模偏振光,提高器件光提取效率;通过隧道结实现结构倒置,减弱了极化电场的影响,提高量子阱内载流子复合发光效率。本发明进一步拓展了半导体紫外发光器件的应用范围。

Description

一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片及制备方法
技术领域
本发明属于半导体发光器件领域,具体涉及一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片及其制备方法。
背景技术
随着GaN(InGaN、AlGaN)基LED研发的不断深入,其技术创新与应用领域不断扩展,市场也越来越宽广,以AlGaN为主要材料的紫外LED逐渐成为科研人员的研究重点。AlGaN是直接带隙半导体材料,通过调节Al组分的含量,其带隙可在3.4eV~6.2eV之间变化,波长覆盖范围为365nm~200nm,涵盖了大部分紫外波段,是制备紫外LED的理想材料。相比于传统紫外光源,AlGaN基紫外LED具有高效节能、安全环保、可靠耐用、体积小等主要优点,随着技术的发展会逐步替代原有的紫外灯产品,具有重要研究意义。但是,目前AlGaN基紫外LED的发光效率较低,大多在10%以下,而且随着波长变短其发光效率呈指数函数下降。主要原因在于:AlGaN材料与蓝宝石衬底之间存在较大的晶格失配,这将在外延膜中产生大量位错,导致器件内量子效率低;高Al组分器件TE模(E⊥c轴)偏振光较弱,光提取效率低;量子阱内极化效应引起强极化电场,导致载流子复合发光效率降低。所以,实现高发光效率AlGaN基紫外LED是至关重要的,这也是未来紫外LED器件一个重要的研究课题之一。
发明内容
本发明的目的就是为解决上述紫外LED发光效率低问题,从提高外延层结晶质量、简化器件制作工艺和改善器件性能等方面综合考虑,在导电SiC衬底上研制带有隧道结的AlGaN基垂直结构谐振腔紫外LED。该器件结构既可改善AlGaN外延层质量,又可提高器件的光提取效率,并可以利用隧道结实现p-n结倒置结构,从而达到提升器件发光效率的目的。
本发明的技术方案是:
本发明所设计的一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片(见附图1和附图说明),其特征在于:其从下至上依次由下电极层11、n-SiC衬底1、n-Alx0Ga1-x0N导电缓冲层2、n-AlGaN基DBR下反射层3、n-Alx1Ga1-x1N电流扩展层4、AlGaN基极化诱导隧道结5、p-Alx2Ga1-x2N空穴注入层6、AlGaN基量子阱有源区7、n-Alx3Ga1-x3N电子注入层8、n-AlGaN基DBR上反射层9和上电极层10构成,其中0.1≤x0、x1、x2、x3≤0.9,电流可在上、下两电极之间垂直于外延层注入器件;本发明采用与AlGaN晶格更匹配的n-SiC作为衬底1,远小于它与蓝宝石衬底之间的晶格失配,这非常有利于改善AlGaN外延层质量,降低位错密度,提高器件内量子效率;利用n-AlGaN基DBR分别作为下反射层3和上反射层9,构成谐振腔结构,增强TE模偏振光,提高器件光提取效率;通过AlGaN基极化诱导隧道结5实现p-n结倒置结构,即LED结构倒序生长,其生长顺序为在下反射层3上依次制备n-Alx1Ga1-x1N电流扩展层4、AlGaN基极化诱导隧道结5、p-Alx2Ga1-x2N空穴注入层6、AlGaN基量子阱有源区7、n-Alx3Ga1-x3N电子注入层8。正向电流可通过n-SiC衬底1导入,依次穿过n-Alx0Ga1-x0N导电缓冲层2、n-AlGaN基DBR下反射层3、n-Alx1Ga1-x1N层电流扩展4,并最终穿过隧道结5进入p-Alx2Ga1-x2N空穴注入层6。与n型电子注入层和p型空穴注入层分别位于有源区下面和上面的常规LED结构相比,p-n结倒置结构可减弱极化电场的影响,提高量子阱内载流子复合发光效率。
如上所述的一种n-SiC衬底AlGaN基垂直导电结构谐振腔紫外LED芯片,采用n-AlGaN基DBR作为上反射层9和下反射层3形成谐振腔;其特征在于:DBR由n-Alx4Ga1-x4N层和n-Alx5Ga1-x5N层交替生长组成(0.1≤x4、x5≤0.9,且x4≠x5),每层厚度可由公式d=λ/4n(d为层厚,λ为DBR的中心波长,n为折射率)决定,通过两层组分差和对数可以控制DBR的反射率;其中,上反射层9中DBR的对数为15~20对,反射率为75%~80%;下反射层3中DBR对数为30~50对之间,反射率为95%以上;并且,通过调整谐振腔内各层厚度,可以实现谐振腔的腔模谐振波长、DBR的中心波长、有源区的发光谱峰值波长三者相匹配。
如上所述的一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片,其特征在于:AlGaN基极化诱导隧道结5由下至上依次由n-Alx6Ga1-x6N层12、Alx7Ga1-x7N极化诱导层13和p-Alx6Ga1-x6N层14构成(见附图2和附图说明,即n-Alx6Ga1-x6N层12位于n-Alx1Ga1-x1N电流扩展层4的上面,p-Alx6Ga1-x6N层14位于p-Alx2Ga1-x2N空穴注入层6的下面),其中0.1≤x6<x7≤0.9;由于AlGaN的强极化效应,在Alx7Ga1-x7N极化诱导层13界面两侧将分别产生高密度的二维空穴气和电子气,从而提高了AlGaN基极化诱导隧道结的隧穿几率和隧穿电流。
一种如上所述的n-SiC衬底AlGaN基垂直导电结构谐振腔紫外LED芯片的制备方法,其步骤如下:
(1)在n-SiC衬底1上采用MOCVD方法依次外延生长n-Alx0Ga1-x0N导电缓冲层2(厚度50~100nm)、n-AlGaN基DBR下反射层3(DBR对数在30~50对之间,反射率95%以上,厚度2~3μm)、n-Alx1Ga1-x1N电流扩展层4(厚度200~300nm)、AlGaN基极化诱导隧道结5(p-Alx6Ga1-x6N层14厚度为100~200nm,Alx7Ga1-x7N极化诱导层13厚度为5~15nm,n-Alx6Ga1-x6N层12厚度为100~200nm)、p-Alx2Ga1-x2N空穴注入层6(厚度200~300nm)、AlGaN基量子阱有源区7(量子阱由阱层Alx8Ga1-x8N和垒层Alx9Ga1-x9N交替生长组成,对数在3~5对之间,每个阱层的厚度2~5nm,每个垒层的厚度10~20nm,其中0≤x8<x9≤0.9)、n-Alx3Ga1-x3N电子注入层8(厚度200~300nm)、n-AlGaN基DBR上反射层9(DBR对数在15~20对之间,反射率控制在75%~80%之间,厚度1~2μm),从而制备得到AlGaN基谐振腔紫外LED结构;生长源为三甲基铝、三甲基镓和高纯氨气,生长温度为1000~1200℃,生长压强为100~300mbar,并利用硅烷和二茂镁分别进行n型和p型掺杂,掺杂浓度为1017~1020/cm3
(2)在n-AlGaN基DBR上反射层9上制备上电极层10(厚度30~120nm),在n-SiC衬底背面制备下电极层11(厚度60~100nm);电极材料可以是Au、Ni等单质材料或Ni-Au、Ti-Au、Zn-Au、Pt-Au等二元合金材料,也可以是Ti-Pt-Au、Ti-Ni-Au或Ni-Pt-Au等三元合金材料,制备电极的方法可采用热蒸镀、电子束蒸镀或磁控溅射方法。
本发明的效果和益处:本发明采用与AlGaN晶格更匹配的SiC衬底,改善AlGaN质量,提高内量子效率;利用DBR形成谐振腔,提高光提取效率;通过隧道结实现pn结倒置,减弱极化电场影响,提高量子阱内载流子复合发光效率。同时,垂直结构LED可有效避免电流拥堵效应。本发明方法可以获得高效的AlGaN基紫外LED,进一步拓展半导体紫外发光器件的应用范围。
附图说明
图1:本发明所述AlGaN基垂直结构谐振腔紫外LED的结构示意图;
图2:本发明所述AlGaN基垂直结构谐振腔紫外LED结构中的AlGaN基极化诱导隧道结的结构示意图,其中“+”和“-”分别表示界面处形成的正极化电荷与负极化电荷;
图3:实施例1制备的LED的DBR的扫描电子显微镜照片;
图4:实施例1制备的LED的电注入发光谱图;
图5:常规的LED与实施例1制备的LED的光输出强度对比图。
图中标识,1为n-SiC衬底,2为n-Alx0Ga1-x0N导电缓冲层,3为下反射层(n-AlGaN基下DBR),4为n-Alx1Ga1-x1N电流扩展层,5为AlGaN基极化诱导隧道结,6为p-Alx2Ga1-x2N空穴注入层,7为AlGaN基量子阱有源区,8为n-Alx3Ga1-x3N电子注入层、9为上反射层(n-AlGaN基上DBR),10为上电极层,11为下电极层,12为n-Alx6Ga1-x6N层,13为Alx7Ga1-x7N极化诱导层,14为p-Alx6Ga1-x6N层。
具体实施方式
以下结合技术方案和附图详细叙述本发明的具体实施例。
实施例1:
1.采用MOCVD方法,在商用n-SiC衬底上一次性外延制备AlGaN基紫外LED结构,如图1所示。具体结构如下:在n-SiC(掺杂浓度为2×1018/cm3)衬底上1依次制备n-Al0.3Ga0.7N导电缓冲层2(厚度80nm)、n-AlGaN基DBR下反射层3(由34nm厚n-Al0.1Ga0.9N层和36nm厚n-Al0.3Ga0.7N层交替生长组成,掺杂浓度分别为2×1018/cm3和4×1018/cm3,对数为30,反射率为95%)、n-Al0.1Ga0.9N层电流扩展层4(掺杂浓度5×1017/cm3,厚度200nm)、AlGaN基极化诱导隧道结5(Al0.3Ga0.7N极化诱导层13厚度10nm,该层未掺杂;n-Al0.1Ga0.9N层12和p-Al0.1Ga0.9N层14厚度均为100nm,掺杂浓度分别为4×1018/cm3和1×1020/cm3)、p-Al0.1Ga0.9N空穴注入层6(掺杂浓度1×1020/cm3,厚度200nm)、AlGaN基量子阱有源区7(量子阱对数为3对,阱层为GaN,厚度2nm;垒层为Al0.1Ga0.9N,厚度10nm)、n-Al0.1Ga0.9N电子注入层8(掺杂浓度2×1018/cm3,厚度200nm)、n-AlGaN基DBR上反射层9(由34nm厚n-Al0.1Ga0.9N层和36nm厚n-Al0.3Ga0.7N层交替生长组成,掺杂浓度分别为2×1018/cm3和4×1018/cm3,对数为15对,反射率为75%)。生长源为三甲基铝、三甲基镓和高纯氨气,利用硅烷和二茂镁分别进行n型和p型掺杂,AlGaN导电缓冲层2生长温度为1100℃,反应压强为100mbar,其他各层生长温度均为1060℃,反应压强为300mbar。器件各层具体生长参数见表1。图3为AlGaN基DBR的扫描电子显微镜照片,可以发现周期性DBR结构形成,且界面特性良好。
2.上、下表面分别采用热蒸镀方法制备Ni/Au电极层10(厚度60nm,Ni层厚度为30nm,Au层厚度为30nm)和Ni电极层11(厚度80nm),实现垂直结构AlGaN基紫外LED。电极的具体制备工艺见表2。
3.图4所示为器件在不同驱动电流下的电致发光谱,此时器件的下电极连接直流电源的正极,上电极连接负极。在5mA、10mA、15mA、20mA、25mA和30mA的正向电流下,发光谱在360nm处均显示出紫外发射峰。从图5中还可以发现,相比常规LED,谐振腔LED器件其输出光强度较以往提高了2倍。由上面一些数据可以看出本发明方案的优越性和效果。
表1:垂直结构谐振腔紫外LED的各层生长参数
表1附注:TMGa代表三甲基镓;TMAl代表三甲基铝;Cp2Mg代表二茂镁;SiH4代表硅烷;NH3代表高纯氨气。
表2:器件电极制备工艺参数
下电极Ni 上电极第一层Ni 上电极第二层Au
蒸发时间(秒) 80 30 20
腔内压力(帕斯卡) 1.3×10-3 1.3×10-3 1.3×10-3
厚度(纳米) 80 30 30

Claims (5)

1.一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片,其特征在于:其依次由下电极层(11)、n-SiC衬底(1)、n-Alx0Ga1-x0N导电缓冲层(2)、n-AlGaN基DBR下反射层(3)、n-Alx1Ga1-x1N电流扩展层(4)、AlGaN基极化诱导隧道结(5)、p-Alx2Ga1-x2N空穴注入层(6)、AlGaN基量子阱有源区(7)、n-Alx3Ga1-x3N电子注入层(8)、n-AlGaN基DBR上反射层(9)和上电极层(10)构成,0.1≤x0、x1、x2、x3≤0.9;
其中,n-AlGaN基DBR由n-Alx4Ga1-x4N层和n-Alx5Ga1-x5N层交替生长组成,0.1≤x4、x5≤0.9,且x4≠x5,上反射层(9)中DBR的对数为15~20对,反射率为75%~80%;下反射层(3)中DBR对数为30~50对之间,反射率为95%以上;
AlGaN基极化诱导隧道结(5)由下至上依次由n-Alx6Ga1-x6N层(12)、Alx7Ga1-x7N极化诱导层(13)和p-Alx6Ga1-x6N层(14)构成,其中0.1≤x6<x7≤0.9;
AlGaN基量子阱有源区(7)由阱层Alx8Ga1-x8N和垒层Alx9Ga1-x9N交替生长组成,对数在3~5对之间,0≤x8<x9≤0.9。
2.如权利要求1所述的一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片,其特征在于:n-Alx0Ga1-x0N导电缓冲层(2)的厚度为50~100nm、n-AlGaN基DBR下反射层(3)的厚度为2~3μm、n-Alx1Ga1-x1N电流扩展层(4)的厚度为200~300nm、p-Alx6Ga1-x6N层(14)的厚度为100~200nm、Alx7Ga1-x7N极化诱导层(13)的厚度为5~15nm、n-Alx6Ga1-x6N层(12)的厚度为100~200nm、p-Alx2Ga1-x2N空穴注入层(6)的厚度为200~300nm、AlGaN基量子阱有源区(7)中每个阱层Alx8Ga1-x8N的厚度为2~5nm、每个垒层Alx9Ga1-x9N的厚度为10~20nm、n-Alx3Ga1-x3N电子注入层(8)的厚度为200~300nm、n-AlGaN基DBR上反射层(9)的厚度为1~2μm、上电极层(10)的厚度为30~120nm、下电极层(11)的厚度为60~100nm。
3.如权利要求1所述的一种n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片,其特征在于:电极材料是Au、Ni单质材料,Ni-Au、Ti-Au、Zn-Au、Pt-Au二元合金材料,Ti-Pt-Au、Ti-Ni-Au、Ni-Pt-Au三元合金材料中的一种。
4.权利要求1所述的n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片的制备方法,其步骤如下:
(1)在n-SiC衬底(1)上采用MOCVD方法依次外延生长n-Alx0Ga1-x0N导电缓冲层(2)、n-AlGaN基DBR下反射层(3)、n-Alx1Ga1-x1N电流扩展层(4)、AlGaN基极化诱导隧道结(5)、p-Alx2Ga1-x2N空穴注入层(6)、AlGaN基量子阱有源区(7)、n-Alx3Ga1-x3N电子注入层(8)、n-AlGaN基DBR上反射层(9);生长源为三甲基铝、三甲基镓和高纯氨气,生长温度为1000~1200℃,生长压强为100~300mbar,利用硅烷和二茂镁分别进行n型和p型掺杂,掺杂浓度为1017~1020/cm3
(2)在n-AlGaN基DBR上反射层(9)上制备上电极层(10),在n-SiC衬底背面制备下电极层(11),从而制备得到n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片。
5.如权利要求4所述的n-SiC衬底AlGaN基垂直结构谐振腔紫外LED芯片的制备方法,其特征在于:制备上电极层(10)和下电极层(11)的方法为热蒸镀、电子束蒸镀或磁控溅射方法。
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