CN112095117B - 一种InGaN基光阳极的制备方法 - Google Patents
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Abstract
本发明公开了一种InGaN基光阳极的制备方法,具体按照以下步骤实施:步骤1、在酸性溶液中,采用光电化学刻蚀技术对GaN多层结构进行恒电压刻蚀,制备出中孔GaN镜;步骤2、以中孔GaN镜为衬底,先采用MOCVD技术外延生长InGaN/GaN层,通过能带工程调制In组分,调制其带隙,然后采用电子束蒸发技术,蒸镀欧姆接触电极,制备出InGaN基光阳极;本发明的方法能够制备出开启电压低、效率高及稳定性强的光阳极电极。
Description
技术领域
本发明属于半导体异质结制备技术领域,具体涉及一种InGaN基光阳极的制备方法。
背景技术
与传统光电极(如:Si,TiO2,ZnO等)相比,InGaN基薄膜材料在可见光区具有量子效率高、稳定性好等优点,引起广泛关注。然而,由于异质外延制备的InGaN层存在应力大、极化效应强等缺点,限制了其光解水效率。中孔GaN镜具有高的光反射效应、大的应力松弛、低的缺陷密度,以其为衬底,所生长InGaN基薄膜呈现出大的应力松弛、小的极化效应及高的晶体质量,有望显著提高InGaN基光阳极的转化效率。
发明内容
本发明的目的是提供一种InGaN基光阳极的制备方法,能够制备出开启电压低、效率高及稳定性强的光阳极电极。
本发明采用的技术方案是,一种InGaN基光阳极的制备方法,具体按照以下步骤实施:
步骤1、在酸性溶液中,采用光电化学刻蚀技术对GaN多层结构进行恒电压刻蚀,制备出中孔GaN镜;
步骤2、以中孔GaN镜为衬底,先采用MOCVD技术外延生长InGaN/GaN层,通过能带工程调制In组分,调制其带隙,然后采用电子束蒸发技术,蒸镀欧姆接触电极,制备出InGaN基光阳极。
步骤1刻蚀技术为光电化学刻蚀技术,酸性溶液是浓度为0.3-0.5mol/L的硫酸、硝酸或盐酸水溶液中的任意一种。
恒电压刻蚀的电压为5-50V,刻蚀时间范围为5-80min。
步骤1中GaN多层结构包括低掺杂GaN层和高掺杂GaN层,厚度均为50-68nm,低掺杂GaN层掺杂浓度为4.0×1015-1.0×1018cm-3,高掺杂GaN层掺杂浓度为3.0×1018-4.0×1019cm-3,周期数为7。
步骤2中InGaN/GaN层包括GaN层、超晶格结构和多量子阱层。
GaN层是在850-1060℃温度下制备的1.5-2.6μm厚的n-GaN层,掺杂浓度为3.5×1018-7.5×1019cm-3;超晶格结构是周期为9-11的Inx Ga1-x N/GaN超晶格结构,其中,0<x<0.1,每个周期中,Inx Ga1-x N厚度为3-4nm,GaN厚度为7nm;多量子阱层是周期14-30的InyGa1-y N/GaN多量子阱结构,其中,0.1<y<0.4,每个周期中,InyGa1-y N厚度为4-6nm,GaN厚度为10-11nm;p-GaN层是Mg掺杂p-GaN层,掺杂浓度为1×1019cm-3-6×1019cm-3,厚度为100-300nm。
本发明一种InGaN基光阳极的制备方法有益效果是:
1)中孔GaN镜具有高的光反射效应、大的应力松弛、低的缺陷密度,以其为衬底,所生长InGaN基薄膜呈现出大的应力松弛、小的极化效应及高的晶体质量,有望显著提高InGaN基光阳极的转化效率;
2)InGaN/GaN结构中的GaN层生长温度可以影响底部中孔GaN镜的光反射能力以及InGaN基薄膜的晶体质量;当GaN层再生长温度在850-1060℃之间时,中孔GaN镜保持较高的反射率,InGaN基薄膜的晶体质量显著提高,有利于提高光电极的转化效率;
3)本发明中工艺条件易于精确控制,制备的具有中孔GaN镜的InGaN基光阳极均匀性和重复性好,便于产业化生产;所制备的光阳极还具有开启电压低、转化效率高、稳定性强等优良特性,有着广阔的应用前景。
附图说明
图1是实施例3制备的中孔GaN镜的切面扫描电子显微镜照片,图中标尺为200nm;
图2是实施例3制备的中孔GaN镜的反射光谱;
图3是实施例3制备的具有中孔GaN镜的InGaN基光阳极的切面扫描电子显微镜图片;
图4是InGaN基光阳极的HRXRD图谱;
图5是InGaN基光阳极的InGaN(0002)峰对应的摇摆曲线;
图6是InGaN基光阳极的拉曼光谱;
图7是InGaN基光阳极的光电流-电压曲线;
图8是InGaN基光阳极的转换效率-电压曲线;
图9是InGaN基光阳极的光电流-时间曲线。
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
本发明一种InGaN基光阳极的制备方法,具体按照以下步骤实施:
步骤1、在酸性溶液中,采用光电化学刻蚀技术对GaN多层结构进行恒电压刻蚀,制备出中孔GaN镜;
其中,刻蚀技术为光电化学刻蚀技术,酸性溶液是浓度为0.3-0.5mol/L的硫酸、硝酸或盐酸水溶液中的任意一种。
恒电压刻蚀的电压为5-50V,刻蚀时间范围为5-80min。
GaN多层结构包括低掺杂GaN层和高掺杂GaN层,厚度均为50-68nm,低掺杂GaN层掺杂浓度为4.0×1015-1.0×1018cm-3,高掺杂GaN层掺杂浓度为3.0×1018-4.0×1019cm-3,周期数为7。
步骤2、以中孔GaN镜为衬底,先采用MOCVD技术外延生长InGaN/GaN层,通过能带工程调制In组分,调制其带隙,然后采用电子束蒸发技术,蒸镀欧姆接触电极,制备出InGaN基光阳极。
其中,InGaN/GaN层包括GaN层、超晶格结构和多量子阱层。
GaN层是在850-1060℃温度下制备的1.5-2.6μm厚的n-GaN层,掺杂浓度为3.5×1018-7.5×1019cm-3;超晶格结构是周期为9-11的Inx Ga1-x N/GaN超晶格结构,其中,0<x<0.1,每个周期中,Inx Ga1-x N厚度为3-4nm,GaN厚度为7nm;多量子阱层是周期14-30的InyGa1-y N/GaN多量子阱结构,其中,0.1<y<0.4,每个周期中,InyGa1-y N厚度为4-6nm,GaN厚度为10-11nm;p-GaN层是Mg掺杂p-GaN层,掺杂浓度为1×1019cm-3-6×1019cm-3,厚度为100-300nm。
实施例1
在外延衬底上,先后生长低温GaN缓冲层和GaN多层结构,生长温度1070℃,低掺杂GaN层和高掺杂GaN层厚度均为52nm,低掺杂GaN层掺杂浓度为4.0×1015,高掺杂GaN层掺杂浓度为2.5×1019,周期数为7。
在0.1mol/L的硝酸溶液中,开启光电化学刻蚀设备,开启紫外灯,并将刻蚀电压设定为16V;以铂丝为阴极,以GaN多层结构为阳极,恒电压刻蚀40分钟;刻蚀结束后,关闭光电化学刻蚀设备;将阳极样品用去离子水冲洗后,用氮气吹干,得中孔GaN镜;
以中孔GaN镜为衬底,将该衬底置于MOCVD生长室中,在850℃下生长GaN,掺杂浓度为5.0×1018cm-3,厚度为1.5μm,在800℃,生长9周期的In0.01Ga0.99 N/GaN超晶格结构,其中阱和垒厚度分别为3nm和7nm,继续生长18周期的In0.15 Ga0.85 N/GaN多量子阱结构,其中阱和垒的生长温度分别为750℃和850℃,生长厚度分别为4nm和10nm,最后,在970℃下,生长掺Mg的p-GaN,其掺杂浓度为1.5×1019cm-3,厚度为100nm,蒸镀欧姆接触电极(Ti/Al/Ni/Au合金),制备出具有中孔GaN镜的InGaN基光阳极。
实施例2
在外延衬底上先后生长低温GaN缓冲层和GaN多层结构,生长温度1070℃,低掺杂GaN层掺杂浓度为5.0×1017cm-3,厚度为55nm,高掺杂GaN层掺杂浓度为3.0×1019cm-3,厚度为52nm,制备出GaN多层结构;
在0.2mol/L的硝酸溶液中,开启光电化学刻蚀设备,开启白光灯,并将刻蚀电压设定为10V;以铂丝为阴极,以GaN多层结构为阳极,恒电压刻蚀80分钟;刻蚀结束后,关闭光电化学刻蚀设备;将阳极样品用去离子水冲洗后,用氮气吹干,得中孔GaN镜;
以中孔GaN镜为衬底,将该衬底置于MOCVD生长室中,在1000℃下生长GaN,掺杂浓度为9×1018cm-3,厚度为2.0μm,在800℃,生长10周期的In0.03 Ga0.97N/GaN超晶格结构,其中阱和垒厚度分别为3nm和7nm,继续生长14周期的In0.2 Ga0.8N/GaN多量子阱结构,其中阱和垒的生长温度分别为750℃和850℃,生长厚度分别为4nm和10nm,最后,在970℃下,生长掺Mg的p-GaN,其掺杂浓度为4×1019cm-3,厚度为150nm,蒸镀欧姆接触电极(Ti/Al/Ni/Au合金),制备出具有中孔GaN镜的InGaN基光阳极。
实施例3
在外延衬底上先后生长低温GaN缓冲层和GaN多层结构,生长温度1070℃,轻掺杂GaN掺杂浓度和厚度分别为5.0×1015cm-3和50nm,重掺杂GaN掺杂浓度和厚度分别为1×1019cm-3和65nm,制备出GaN多层结构,在0.3mol/L的硝酸溶液中,开启光电化学刻蚀设备,并将刻蚀电压设定为15V;以铂丝为阴极,以GaN多层结构为阳极,恒电压刻蚀20分钟;刻蚀结束后,关闭光电化学刻蚀设备;将阳极样品用去离子水冲洗后,用氮气吹干,得中孔GaN镜;
以中孔GaN镜为衬底,将该衬底置于MOCVD生长室中,在1050℃下生长GaN,掺杂浓度为8×1018cm-3,厚度为2.54μm,在800℃,生长10周期的In0.05 Ga0.95 N/GaN超晶格结构,其中阱和垒厚度分别为3nm和7nm,继续生长14周期的In0.2 Ga0.8 N/GaN多量子阱结构,其中阱和垒的生长温度分别为750℃和850℃,生长厚度分别为4nm和10nm,最后,在970℃下,生长掺Mg的p-GaN,其掺杂浓度为5×1019cm-3,厚度为280nm,蒸镀欧姆接触电极(Ti/Al/Ni/Au合金),制备出具有中孔GaN镜的InGaN基光阳极。
实施例4
在外延衬底上先后生长低温GaN缓冲层和GaN多层结构,生长温度1070℃,轻掺杂GaN的掺杂浓度和厚度分别为1×1018cm-3和55nm,重掺杂GaN的掺杂浓度和厚度分别为1×1019cm-3和60nm,制备出GaN多层结构,在0.5mol/L的硝酸溶液中,开启光电化学刻蚀设备,并将刻蚀电压设定为30V;以铂丝为阴极,以GaN多层结构为阳极,恒电压刻蚀15分钟;刻蚀结束后,关闭光电化学刻蚀设备;将阳极样品用去离子水冲洗后,用氮气吹干,得中孔GaN镜;
以中孔GaN镜为衬底,将该衬底置于MOCVD生长室中,在950℃下生长GaN,掺杂浓度为2×1019cm-3,厚度为2.0μm,在800℃,生长11周期的In0.07Ga0.93 N/GaN超晶格结构,其中阱和垒厚度分别为4nm和7nm,继续生长20周期的In0.3Ga0.7 N/GaN多量子阱结构,其中阱和垒的生长温度分别为750℃和850℃,生长厚度分别为4nm和10nm,最后,在970℃下,生长掺Mg的p-GaN,其掺杂浓度为5.5×1019cm-3,厚度为260nm,蒸镀欧姆接触电极(Ti/Al/Ni/Au合金),制备出具有中孔GaN镜的InGaN基光阳极。
实施例5
在外延衬底上先后生长低温GaN缓冲层和GaN多层结构,生长温度1070℃,轻掺杂GaN的掺杂浓度和厚度分别为9×1016cm-3和65nm,重掺杂GaN的掺杂浓度和厚度分别为4×1019cm-3和50nm,制备出GaN多层结构,在0.7mol/L的硝酸溶液中,开启光电化学刻蚀设备,并将刻蚀电压设定为40V;以铂丝为阴极,以GaN多层结构为阳极,恒电压刻蚀15分钟;刻蚀结束后,关闭光电化学刻蚀设备;将阳极样品用去离子水冲洗后,用氮气吹干,得中孔GaN镜;
以中孔GaN镜为衬底,将该衬底置于MOCVD生长室中,在950℃下生长GaN,掺杂浓度为7.5×1019cm-3,厚度为2.6μm,在800℃生长11周期的In0.09Ga0.91N/GaN超晶格结构,其中阱和垒厚度分别为3nm和7nm,继续生长25周期的In0.35 Ga0.65N/GaN多量子阱结构,其中阱和垒的生长温度分别为750℃和850℃,生长厚度分别为4nm和10nm,最后,在970℃下,生长掺Mg的p-GaN,其掺杂浓度为6×1019cm-3,厚度为300nm,蒸镀欧姆接触电极(Ti/Al/Ni/Au合金),制备出具有中孔GaN镜的InGaN基光阳极。
对本发明中实施例3制备的具有中孔GaN镜的InGaN基光阳极进行实验,结果如下:
如图1是本实施3中孔GaN镜的切面扫描电子显微镜(SEM)照片,图中标尺为200纳米。
图2是实施例3制备的中孔GaN镜的反射光谱,其中,横坐标:波长(wavelength),单位:纳米(nm),纵坐标:反射率(Reflectance),由图2可知,该反射镜在440-515nm之间的反射率约为97%。
本实施例3所制备的InGaN基光阳极的切面SEM照片如图3所示,其中标尺:1微米(1μm);从图3中可以看到,再生长以后,中孔GaN镜层保持较好的周期性结构。
本实施例3所制备的InGaN基光阳极的HRXRD图谱如图4所示,其中,横坐标:角度(2θ),单位:度(degree),纵坐标:强度(Intensity)。参比InGaN基样品记为样品1,具有中孔GaN镜的InGaN基光阳极记为样品2,由图4可知,两个光电极都出现两个衍射峰,其中强的衍射峰对应的是GaN(0002)峰,弱的衍射峰对应的是InGaN(0002)峰。
本实施例3所制备的InGaN基光阳极的InGaN(0002)峰对应的摇摆曲线如图5所示,其中,横坐标:角度(ω),单位:度(degree),纵坐标:强度(Intensity),由图5可知,与参比光电极相比,具有中孔GaN镜的InGaN基光电极呈现出较小的半高宽,这一结果表明在中孔GaN镜衬底上更易制备出高质量的InGaN基光电极。
本实施例3所制备的InGaN基光阳极的拉曼光谱如图6所示,其中,横坐标:波数(Raman shifit),单位:纳米(cm-1),纵坐标:强度(Intensity),由图6可知,与参比光电极相比,具有中孔GaN镜的InGaN基光电极的拉曼峰呈现出红移,这一结果表明在中孔GaN镜衬底上制备出的InGaN基光电极发生明显的应力松弛。
实施例3制备的InGaN基光阳极的光电流-电压曲线如图7所示,其中,横坐标:电压(voltage),单位:(V),纵坐标:光电流(photocurrent),单位:(mA cm-2),图7中曲线1为参比InGaN基光阳极的光电流-电压曲线,曲线2为具有中孔GaN镜的InGaN基光阳极的光电流-电压曲线。与参比电极相比,具有中孔GaN镜的InGaN基光阳极的开启电压降低、光电流显著提高;此外,其转化效率提高3-8倍,且表面平整光滑。
实施例3制备的InGaN基光阳极的转换效率-电压曲线如图8所示,其中,横坐标:电压(voltage),单位:(V),纵坐标:转换效率(conversion efficiency),图8中曲线1为参比InGaN基光阳极,曲线2为具有中孔GaN镜的InGaN基光阳极;由图8可知实施例3制备的光阳极转化效率提高3-8倍。
如图9所示,实施例3制备的InGaN基光阳极的光电流-时间曲线,其中,横坐标:时间(Time),单位:(s),光电流(photocurrent),单位:(mA cm-2),图9中曲线1为参比InGaN基光阳极,曲线2为具有中孔GaN镜的InGaN基光阳极,由图9可知具有中孔GaN镜的InGaN基光电极,其光电流在10000s内只有较小的衰减,这表明该光电极在光解水制氢过程中具有较好的稳定性。
为了说明本发明的光阳极效果,进行以下对比实验验证:
对比例1
以实施例3步骤1的方法采用MOCVD技术在面蓝宝石衬底上制备GaN多层结构,以所得未刻蚀的GaN多层结构为衬底,采用实施例3步骤2完全相同的工艺条件,制备InGaN基光阳极。由图5可知,与参比光电极相比,具有中孔GaN镜的InGaN基光电极呈现出较小的半高宽,这一结果表明在中孔GaN镜衬底上更易制备出高质量的InGaN基光电极。由图6可知,与参比光电极相比,具有中孔GaN镜的InGaN基光电极的拉曼峰呈现出红移,这一结果表明在中孔GaN镜衬底上制备出的InGaN基光电极发生明显的应力松弛。由图7-9可知,与参比电极相比,具有中孔GaN镜的InGaN基光阳极的开启电压降低、光电流显著提高;此外,其转化效率提高3-8倍,且表面平整光滑,稳定性高。
对比例2
制备方法与实施例3相同,所不同的是刻蚀电压由25V增加到45V。制备的具有中孔GaN镜的InGaN基光阳极表面出现明显的脱落现象,变得凹凸不平。
对比例3
制备方法与实施例3相同,所不同的是步骤2在采用MOCVD方法在中孔GaN镜上再生长过程中,GaN层最初生长温度为1070℃,没有采用分段升温生长模式。制备的具有中孔GaN镜的InGaN基光阳极,虽表面平整光滑,但表面颜色变黑,有金属镓析出。
对比例4
制备方法与实施例3相同,所不同的是,GaN多层结构中重掺杂GaN掺杂浓度由2×1019cm-3增加至5×1019cm-3。制备的具有中孔GaN镜的InGaN基光阳极表面出现明显脱落现象。
通过上述方式,本发明一种InGaN基光阳极的制备方法,工艺条件易于精确控制,制备的具有中孔GaN镜的InGaN基光阳极均匀性和重复性好,便于产业化生产,所制备的光阳极具有开启电压低、转化效率高、稳定性强等优良特性,有着广阔的应用前景。
Claims (3)
1.一种InGaN基光阳极的制备方法,其特征在于,具体按照以下步骤实施:
步骤1、在酸性溶液中,采用光电化学刻蚀技术对GaN多层结构进行恒电压刻蚀,制备出中孔GaN镜;
所述GaN多层结构包括低掺杂GaN层和高掺杂GaN层,厚度均为50-68nm,低掺杂GaN层掺杂浓度为4.0×1015-1.0×1018cm-3,高掺杂GaN层掺杂浓度为3.0×1018-4.0×1019cm-3,周期数为7;
步骤2、以中孔GaN镜为衬底,先采用MOCVD技术外延生长InGaN/GaN层,所述InGaN/GaN层包括GaN层、超晶格结构和多量子阱层,所述GaN层是在850-1060℃温度下制备的1.5-2.6μm厚的n-GaN层,掺杂浓度为3.5×1018-7.5×1019cm-3;所述超晶格结构是周期为9-11的InxGa1-x N/GaN超晶格结构,其中,0<x<0.1,每个周期中,Inx Ga1-x N厚度为3-4nm,GaN厚度为7nm;所述多量子阱层是周期14-30的Iny Ga1-yN/GaN多量子阱结构,其中,0.1<y<0.4,每个周期中,InyGa1-y N厚度为4-6nm,GaN厚度为10-11nm,最后生长掺Mg的p-GaN层,掺杂浓度为1×1019cm-3-6×1019cm-3,厚度为100-300nm;
通过能带工程调制In组分,调制其带隙,然后采用电子束蒸发技术,蒸镀欧姆接触电极,制备出InGaN基光阳极。
2.根据权利要求1所述一种InGaN基光阳极的制备方法,其特征在于,步骤1所述刻蚀技术为光电化学刻蚀技术,所述酸性溶液是浓度为0.3-0.5mol/L的硫酸、硝酸或盐酸水溶液中的任意一种。
3.根据权利要求1所述一种InGaN基光阳极的制备方法,其特征在于,所述恒电压刻蚀的电压为5-50V,刻蚀时间范围为5-80min。
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