CN114142344B - 一种提高蓝、绿光半导体激光器电学特性的方法及器件 - Google Patents
一种提高蓝、绿光半导体激光器电学特性的方法及器件 Download PDFInfo
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Abstract
本发明公开了一种提高蓝、绿光半导体激光器电学特性的方法及器件。本发明在蓝、绿光半导体激光器的上限制层的上、下表面各设置一层Al组分渐变的p‑AlGaN极化诱导层,通过双层极化诱导p型掺杂的的方式增加空穴注入,减少电子泄漏,提高有源区载流子复合效率,改善蓝、绿光激光器电学特性。本发明采用的处理方法具有工艺稳定、成本低廉、成品率高、设备简单易操作、适合产业化生产等优点。
Description
技术领域
本发明涉及半导体器件技术领域,具体涉及一种采用双层极化诱导p型掺杂提高蓝、绿光激光器电学特性的方法及相应器件。
背景技术
氮化镓GaN及其合金因禁带宽度大、电子迁移率高等优点,适用于制造光电子器件、微波功率器件,在航天航空、国防科技等领域具有良好的应用前景。但由于未掺杂氮化物材料背景电子浓度高,作为p型掺杂剂的Mg激活效率低,Mg扩散等因素,导致氮化物材料p型掺杂困难,成为制约相关器件进一步发展的主要技术瓶颈之一。因电子浓度高、扩散长度长而引入电子阻挡层阻碍电子溢出,但同时也产生降低空穴注入效率的势垒。
发明内容
针对以上现有技术中存在的问题,本发明提出了一种双层极化诱导p型掺杂的方式,提高空穴浓度,降低材料电阻率,改善蓝、绿光半导体激光器的电学特性。
本发明的技术方案如下:
一种提高蓝、绿光半导体激光器电学特性的方法,在蓝、绿光半导体激光器的上限制层的上、下表面各设置一层Al组分渐变的p-AlGaN极化诱导层,在增加空穴注入的同时减少电子泄漏,其中位于下层的p-AlGaN极化诱导层的Al组分由30%~40%线性渐变至10%~20%(例如由40%线性渐变至20%或由30%线性渐变至10%),位于上层的p-AlGaN极化诱导层的Al组分由30%线性渐变至0%。
基于上述提高蓝、绿光半导体激光器电学特性的方法,本发明提供了一种蓝、绿光半导体激光器,包括GaN衬底或SiC衬底,在衬底上从下到上依次层叠再生长外延层、下限制层、下波导层、插入层、量子阱层、上保护层、上波导层、极化诱导p-AlGaN电子阻挡层、上限制层、极化诱导p-AlGaN外延层和欧姆接触层,其中,所述极化诱导p-AlGaN电子阻挡层中Al组分由30%~40%线性渐变至10%~20%(例如由40%线性渐变至20%或由30%线性渐变至10%),所述极化诱导p-AlGaN外延层中Al组分由30%线性渐变至0%。
上述蓝、绿光半导体激光器采用双层Al组分渐变的p-AlGaN极化诱导层,作为空穴注入层的同时阻挡电子溢出有源区,提高了蓝、绿光激光器的电学特性。
上述蓝、绿光半导体激光器在制备时,通常先对GaN衬底或SiC衬底进行化学清洗,即依次采用甲苯溶液、丙酮溶液、乙醇溶液和去离子水超声清洗衬底,除去衬底表面的有机物及颗粒沾污,并用氮气枪吹干。然后通过MOCVD方法外延生长再生长外延层、下限制层、下波导层、插入层、量子阱层、上保护层、上波导层、极化诱导p-AlGaN电子阻挡层、上限制层、极化诱导p-AlGaN外延层和欧姆接触层,如果以p-NiO外延层作为欧姆接触层,则采用磁控溅射方式生长p-NiO外延层。
上述蓝、绿光半导体激光器中,依据外延质量及器件性能决定,所述再生长外延层可以是未掺杂GaN或n-GaN再生长外延层,在800~1050℃外延生长,厚度为600纳米~2微米,其中以SiH4作为掺杂剂生长n-GaN外延层。
上述蓝、绿光半导体激光器中,依据外延质量及器件性能决定,所述下限制层为n-AlGaN下限制层或n-AlGaN/n-GaN超晶格下限制层,在1050~1100℃外延生长Al组分为5~10%,厚度为1~2微米,霍尔电子浓度为1E18 cm-3~5E18 cm-3的n-AlGaN下限制层;或者,在1050~1100℃外延生长Al组分为16~20%,厚度为2.5纳米/2.5纳米,霍尔电子浓度为1E18cm-3~5E18 cm-3的n-AlGaN/n-GaN超晶格下限制层。
上述蓝、绿光半导体激光器中,所述下波导层为未掺杂InGaN或n-InGaN下波导层,或者为n-InGaN/n-GaN下双波导层,在785~820℃外延生长In组分1~3%的未掺杂InGaN或n-InGaN下波导层,或In组分1~3%的n-InGaN/n-GaN下双波导层结构,降低光损耗,以上生长厚度依据蓝绿激光器激射条件决定,即激光波长除以2再除以膜层折射率的整数倍,通常蓝绿激光器下波导层厚度为110~500纳米。
上述蓝、绿光半导体激光器中,为改善后续外延生长量子阱结构的表面平整度,设置低温未掺杂GaN或未掺杂InGaN插入层。在下波导层上外延生长厚度2~3纳米的低温未掺杂GaN或In组分为1~2%的未掺杂InGaN层,In组分与量子阱势垒InGaN一致,外延生长温度与量子阱生长温度一致。
上述蓝、绿光半导体激光器中中,所述量子阱层为InGaN/GaN或InGaN/InGaN多量子阱,外延生长1~3对3纳米/15纳米InGaN/GaN或InGaN/InGaN量子阱结构,其中InGaN势垒中In组分为1~2%,外延生长温度依据蓝绿光发光波长决定。
上述蓝、绿光半导体激光器中,所述上保护层为未掺杂GaN或未掺杂InGaN上保护层,外延生长温度、厚度及组分与量子阱势垒结构一致。
上述蓝、绿光半导体激光器中,所述上波导层为未掺杂InGaN上波导层或未掺杂InGaN/未掺杂GaN上双波导层,在720~740℃外延生长In组分1~3%的未掺杂InGaN上波导层,或In组分1~3%的未掺杂InGaN/GaN上双波导层结构,降低光损耗,以上生长厚度依据蓝绿激光器激射条件决定,即激光波长除以2再除以膜层折射率的整数倍,通常蓝绿激光器上波导层厚度为110~500纳米。
上述蓝、绿光半导体激光器中,为了保护量子阱结构,在900~920℃外延生长Al组分由30%~40%线性渐变至10%~20%,厚度20~40纳米的极化诱导p-AlGaN电子阻挡层。
上述蓝、绿光半导体激光器中,依据外延质量及器件性能决定,所述上限制层为p-AlGaN上限制层或p-AlGaN/p-GaN超晶格上限制层。在900~920℃外延生长Al组分5~10%,厚度0.5~1微米的p-AlGaN上限制层,或者Al组分16~20%,厚度2.5纳米/2.5纳米的p-AlGaN/p-GaN超晶格上限制层,以上外延层霍尔空穴浓度为5E17 cm-3~2E18 cm-3。
上述蓝、绿光半导体激光器中,为增加空穴注入并改善器件电学特性,针对Ga极性激光器,在上限制层上于900~920℃外延生长Al组分由30%线性渐变至0%,厚度60~80纳米的极化诱导p-AlGaN外延层,霍尔空穴浓度为1E18 cm-3~2E18 cm-3。
上述蓝、绿光半导体激光器中,所述欧姆接触层为p++-GaN重掺层或p-InGaN层或p-NiO外延层,在极化诱导p-AlGaN外延层上外延生长5~10纳米p++-GaN重掺层或In组分10~20%的p-InGaN欧姆接触层,之后在N2氛围中退火,取出外延片。或者,先在N2氛围中退火,取出外延片,再通过磁控溅射的方式溅射厚度10~20纳米的p-NiO高p型材料。
本发明通过在蓝、绿光激光器外延片生长时采用双层Al组分渐变的p-AlGaN极化诱导层结构的方式,增加空穴注入,减少电子泄漏,提高有源区载流子复合效率,改善蓝、绿光激光器电学特性。本发明采用的处理方法具有工艺稳定、成本低廉、成品率高、设备简单易操作、适合产业化生产等优点。
附图说明
图1为本发明采用双层极化诱导p型掺杂的蓝、绿光激光器的结构示意图,其中:101-衬底,102-再生长外延层,103-下限制层,104-下波导层(或下双波导层),105-插入层,106-量子阱层,107-上保护层,108-上波导层(或上双波导层),109-极化诱导p-AlGaN电子阻挡层,110-上限制层,111-极化诱导p-AlGaN外延层,112-欧姆接触层。
具体实施方式
下面结合附图,通过具体实施例进一步阐述本发明,但不以任何方式限制本发明的保护范围。
本实施例提供一种采用双层极化诱导p型掺杂的蓝、绿光激光器,包括从下到上依次层叠设置在GaN衬底或SiC衬底上的未掺杂GaN或n-GaN再生长外延层、n-AlGaN或n-AlGaN/n-GaN超晶格下限制层、未掺杂InGaN或n-InGaN下波导层或n-InGaN/n-GaN下双波导层、低温未掺杂GaN或未掺杂InGaN插入层、InGaN/GaN或InGaN/InGaN量子阱层、未掺杂GaN或未掺杂InGaN上保护层、未掺杂InGaN上波导层或未掺杂InGaN/未掺杂GaN上双波导层、极化诱导p-AlGaN电子阻挡层、p-AlGaN或p-AlGaN/p-GaN超晶格上限制层、极化诱导p-AlGaN外延层、p++-GaN或p-InGaN欧姆接触层或p-NiO外延层。
该蓝、绿光激光器通过如下步骤制备得到:
1)对GaN衬底或SiC衬底进行化学清洗,即依次采用甲苯溶液、丙酮溶液、乙醇溶液和去离子水超声清洗衬底,除去衬底表面的有机物及颗粒沾污,并用氮气枪吹干。
2)通过MOCVD方法,在GaN或SiC衬底上从下到上依次生长未掺杂GaN或n-GaN再生长外延层、n-AlGaN或n-AlGaN/n-GaN超晶格下限制层、未掺杂InGaN或n-InGaN下波导层或n-InGaN/n-GaN下双波导层、低温未掺杂GaN或未掺杂InGaN插入层、InGaN/GaN或InGaN/InGaN量子阱层、未掺杂GaN或未掺杂InGaN上保护层、未掺杂InGaN或未掺杂InGaN/未掺杂GaN上波导层、极化诱导p-AlGaN电子阻挡层、p-AlGaN或p-AlGaN/p-GaN超晶格上限制层、极化诱导p-AlGaN外延层、p++-GaN或p-InGaN或p-NiO(磁控溅射方式)欧姆接触层。
所述未掺杂GaN再生长外延层在800~1050℃外延,厚度为600纳米~2微米。所述n-GaN再生长外延层以SiH4作为掺杂剂,在800~1050℃外延,厚度为600纳米~2微米。
所述n-AlGaN下限制层在1050~1100℃外延,Al组分为5~10%,厚度为1~2微米,霍尔电子浓度为1E18 cm-3~5E18 cm-3。所述n-AlGaN/n-GaN超晶格下限制层在1050~1100℃外延,Al组分为16~20%,厚度为2.5纳米/2.5纳米,霍尔电子浓度为1E18 cm-3~5E18cm-3。
所述未掺杂InGaN下波导层在785~820℃外延,In组分为1~3%,厚度依据蓝绿激光器激射条件决定,即厚度为激射波长除以2再除以膜层平均折射率所得数值的整数倍。所述n-InGaN下波导层在785~820℃外延,In组分为1~3%,厚度依据蓝绿激光器激射条件决定。所述n-InGaN/n-GaN下双波导层在785~820℃外延,In组分为1~3%,厚度依据蓝绿激光器激射条件决定。
所述低温未掺杂GaN插入层,外延生长温度依据蓝绿光发光波长决定,厚度为2~3纳米。所述未掺杂InGaN插入层,外延生长温度依据蓝绿光发光波长决定,In组分为1~2%,厚度为2~3纳米。
所述InGaN/GaN量子阱层结构为1~3对厚度3纳米/15纳米的周期结构,外延生长温度依据蓝绿光发光波长决定,In组分为1~2%。所述InGaN/InGaN量子阱层结构为1~3对厚度3纳米/15纳米的周期结构,外延生长温度依据蓝绿光发光波长决定,其中InGaN势垒中In组分为1~2%。
所述未掺杂GaN或未掺杂InGaN上保护层外延生长温度、厚度及组分与前述量子阱层势垒结构一致。
所述未掺杂InGaN上波导层在720~740℃外延,In组分为1~3%,厚度依据蓝绿激光器激射条件决定。所述未掺杂InGaN/未掺杂GaN上双波导层在720~740℃外延,In组分为1~3%,厚度依据蓝绿激光器激射条件决定。
所述极化诱导p-AlGaN电子阻挡层以Cp2Mg作为掺杂剂,在900~920℃外延,Al组分由40%线性渐变至20%或由30%线性渐变至10%,厚度为20~40纳米。
所述p-AlGaN上限制层在900~920℃外延,Al组分为5~10%,厚度为0.5~1微米,霍尔空穴浓度为5E17 cm-3~2E18 cm-3。所述p-AlGaN/p-GaN超晶格上限制层在900~920℃外延,Al组分为16~20%,厚度为2.5纳米/2.5纳米,霍尔空穴浓度为5E17 cm-3~2E18 cm-3。
所述极化诱导p-AlGaN外延层在900~920℃外延,Al组分由30%线性渐变至0%,厚度为60~80纳米,霍尔空穴浓度为1E18 cm-3~2E18 cm-3。
所述p++-GaN重掺层厚度为5~10纳米。所述p-InGaN欧姆接触层In组分为10~20%,厚度为5~10纳米。所述p-NiO外延层通过磁控溅射方式溅射,厚度为10~20纳米。
3)对蓝、绿光激光器外延片进行后续工艺处理。
Claims (10)
1.一种提高蓝、绿光半导体激光器电学特性的方法,在蓝、绿光半导体激光器的上限制层的上、下表面各设置一层Al组分渐变的p-AlGaN极化诱导层,在增加空穴注入的同时减少电子泄漏,其中位于下层的p-AlGaN极化诱导层的Al组分从下到上由30%~40%线性渐变至10%~20%,位于上层的p-AlGaN极化诱导层的Al组分从下到上由30%线性渐变至0%。
2.一种蓝、绿光半导体激光器,包括GaN衬底或SiC衬底,在衬底上从下到上依次层叠再生长外延层、下限制层、下波导层、插入层、量子阱层、上保护层、上波导层、极化诱导p-AlGaN电子阻挡层、上限制层、极化诱导p-AlGaN外延层和欧姆接触层,其中,所述极化诱导p-AlGaN电子阻挡层中Al组分从下到上由30%~40%线性渐变至10%~20%,所述极化诱导p-AlGaN外延层中Al组分从下到上由30%线性渐变至0%。
3.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述再生长外延层为未掺杂GaN或n-GaN再生长外延层,厚度为600纳米~2微米。
4.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述下限制层为n-AlGaN下限制层或n-AlGaN/n-GaN超晶格下限制层,其中:所述n-AlGaN下限制层的Al组分为5~10%,厚度为1~2微米,霍尔电子浓度为1E18 cm-3~5E18 cm-3;所述n-AlGaN/n-GaN超晶格下限制层的Al组分为16~20%,厚度为2.5纳米/2.5纳米,霍尔电子浓度为1E18 cm-3~5E18cm-3。
5.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述下波导层为未掺杂InGaN或n-InGaN下波导层,或者为n-InGaN/n-GaN下双波导层,其中In组分为1~3%;所述上波导层为未掺杂InGaN上波导层或未掺杂InGaN/未掺杂GaN上双波导层,其中In组分为1~3%。
6.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述插入层为厚度2~3纳米的低温未掺杂GaN或未掺杂InGaN插入层,其中未掺杂InGaN插入层中In组分为1~2%。
7.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述量子阱层为InGaN/GaN或InGaN/InGaN多量子阱;所述上保护层为未掺杂GaN或未掺杂InGaN上保护层,其厚度及组分与量子阱层的势垒结构一致。
8.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述极化诱导p-AlGaN电子阻挡层是在900~920℃外延生长的Al组分从下到上由30%~40%线性渐变至10%~20%的p-AlGaN层,厚度为20~40纳米。
9.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述上限制层为p-AlGaN上限制层或p-AlGaN/p-GaN超晶格上限制层,其中:所述p-AlGaN上限制层的Al组分为5~10%,厚度为0.5~1微米,霍尔空穴浓度为5E17 cm-3~2E18 cm-3;所述p-AlGaN/p-GaN超晶格上限制层的Al组分为16~20%,厚度为2.5纳米/2.5纳米,霍尔空穴浓度为5E17 cm-3~2E18 cm-3。
10.如权利要求2所述的蓝、绿光半导体激光器,其特征在于,所述极化诱导p-AlGaN外延层是在900~920℃外延生长的Al组分从下到上由30%线性渐变至0%的p-AlGaN层,厚度为60~80纳米,霍尔空穴浓度为1E18 cm-3~2E18 cm-3。
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