CN105449004B - 一种AlGaAs梁式引线PIN二极管及其制备方法 - Google Patents

一种AlGaAs梁式引线PIN二极管及其制备方法 Download PDF

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CN105449004B
CN105449004B CN201510948120.9A CN201510948120A CN105449004B CN 105449004 B CN105449004 B CN 105449004B CN 201510948120 A CN201510948120 A CN 201510948120A CN 105449004 B CN105449004 B CN 105449004B
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李熙华
顾晓春
王霄
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CETC 55 Research Institute
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof  ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/86Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
    • H01L29/861Diodes
    • H01L29/868PIN diodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof  ; Multistep manufacturing processes therefor
    • H01L29/02Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/06Semiconductor bodies ; Multistep manufacturing processes therefor characterised by their shape; characterised by the shapes, relative sizes, or dispositions of the semiconductor regions ; characterised by the concentration or distribution of impurities within semiconductor regions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof  ; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/66007Multistep manufacturing processes
    • H01L29/66075Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
    • H01L29/66083Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by variation of the electric current supplied or the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched, e.g. two-terminal devices
    • H01L29/6609Diodes

Abstract

本发明是一种AlGaAs梁式引线PIN二极管及其制备方法,其特征在于,它是采用P+‑Al0.3Ga0.7As/I‑GaAs/N+‑GaAs异质结PIN结构制作的GaAs基梁式引线PIN二极管。本发明的有益效果是,1)采用P+‑Al0.3Ga0.7As/I‑GaAs/N+‑GaAs异质结PIN结构代替传统的P+‑GaAs/I‑GaAs/N+‑GaAs的GaAs同质结PIN结构,利用异质结的高载流子注入比,有效降低器件的串联电阻。2)采用空气桥工艺,降低器件附加电容。3)器件结构采用梁式引线结构,无管壳封装,使用方便,微波性能优异。制作方法对器件获得的良好效果有:微波测试结果表明,采用P+‑Al0.3Ga0.7As/I‑GaAs/N+‑GaAs异质结PIN结构比相同设计参数的常规器件,串联电阻小10%~20%。

Description

一种AlGaAs梁式引线PIN二极管及其制备方法
技术领域
本发明是涉及的是一种AlGaAs梁式引线PIN二极管及其制备方法,属于半导体微电子设计制造技术领域。
背景技术
微波PIN二极管是微波系统中极为重要的控制器件,广泛应用于各类微波控制电路中,如微波开关、电调衰减器、移相器、限幅器等。
制作微波PIN二极管的材料主要有Si和GaAs,GaAs PIN二极管相较Si PIN二极管,由于电子迁移率高,开关速度更快,可工作于更高的工作频率下。但其RC乘积已近极限,在高频应用中,尤其是3mm频段应用中,损耗偏大,应用受限。
发明内容
本发明提出的是一种AlGaAs梁式引线PIN二极管及其制备方法,利用P+-AlGaAs/I-GaAs异质结较高的载流子注入比,相比GaAs同质结PIN二极管,在相同物理尺寸下(即电容相同),实现更小的串联电阻,从而其RC乘积更小,可应用于更高的工作频率下。
本发明的技术解决技术方案:采用P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs异质结PIN结构代替传统的P+-GaAs/I-GaAs/N+-GaAs的GaAs同质结PIN结构,利用异质结的高载流子注入比,有效降低器件的串联电阻;采用空气桥工艺,降低器件附加电容;器件结构采用梁式引线结构。
本发明的有益效果:器件参数设计与原常规的参数设计完全兼容,并且不增加额外工艺流程情况下实现器件更小的串联电阻。制作工艺方法对器件获得的良好效果:微波测试结果表明,采用P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs异质结PIN结构比相同设计参数的常规器件,串联电阻小10%~20%。
附图说明
附图1是AlGaAs梁式引线PIN二极管的结构示意图。
附图2是P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs/SI-GaAs的结构示意图。
附图3是小台形成的结构示意图。
附图4是大台形成的结构示意图。
附图5是淀积复合介质膜钝化保护结构示意图。
附图6是N+区欧姆电极形成示意图。
附图7是P+区欧姆电极形成示意图。
附图8是电镀Au形成阴极和阳极空气桥示意图。
附图9是电镀形成金梁示意图。
附图10是GaAs背孔工艺,干法刻蚀图形外GaAs和介质的示意图。
图中的1是Si-GaAs衬底,2是N+-GaAs,3是I-GaAs,4是P+-Al0.3Ga0.7As,5是SiO2/Si3N4复合介质膜,6是空气桥,7是金梁。
具体实施方式
如附图所示,AlGaAs梁式引线PIN二极管,其结构在于,材料结构采用P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs结构,器件结构采用梁式引线结构,并采用空气桥工艺降低器件附加电容。
AlGaAs梁式引线PIN二极管的制备方法,包括如下工艺步骤:
1)选择P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs/SI-GaAs外延材料 (图2),其中P+-Al0.3Ga0.7As掺杂杂质为Be,掺杂浓度≥5E19cm-3,厚度为(0.5±0.1)μm;I-GaAs掺杂杂质为Si,掺杂浓度≤5E14cm-3,厚度为(4.0±0.1)μm;N+-GaAs参杂杂质为Si,掺杂浓度≥5E18cm-3,厚度为(2.0±0.1)μm;SI-GaAs衬底电阻率≥1E7Ω·cm,晶向<100>(图2);
2)光刻掩蔽进行ICP刻蚀,刻蚀深度(5.0±0.2)μm,形成小台(图3);
3)光刻掩蔽进行湿法腐蚀,刻蚀深度(2.5±0.2)μm,形成大台(图4);
4)用PECVD工艺在晶圆表面淀积(10000±500)Å SiO2,(2000±100)Å Si3N4,形成复合介质钝化层(图5);
5)光刻掩蔽,刻蚀形成N+区欧姆接触孔,蒸发欧姆接触金属AuGeNi-Au,其中AuGeNi厚度为(1000±100)Å,Au厚度为(2000±200)Å,剥离形成N+区欧姆接触电极(图6);
6)光刻掩蔽,刻蚀形成P+区欧姆接触孔,溅射欧姆接触金属Ti-Pt-Au,其中Ti厚度为(1000±100)Å,Pt厚度为(1500±150)Å,Au厚度为(1000±100)Å,剥离形成P+区欧姆接触电极(图7);
7)光刻掩蔽,采用电镀Au工艺形成阳极和阴极空气桥(图8);
8)快速热处理,使P+区和N+区形成欧姆接触;
9)用PECVD工艺在晶圆表面淀积(1000±100)Å Si3N4,保护晶片表面和空气桥部分,光刻掩蔽刻蚀形成金梁窗口;
10)溅射TiAuTi,进行光刻掩蔽,电镀形成金梁,并湿法去除金梁外金属(图9);
11)减薄晶片,将晶片机械减薄至(100±10)μm;
12)采用双面对准光刻工艺进行背面光刻胶掩蔽,进行GaAs背孔工艺,干法刻蚀图形外GaAs和复合介质层;
13)分离管芯(图10)。

Claims (1)

1.AlGaAs梁式引线PIN二极管的制备方法,其特征是包括如下工艺步骤:
1)选择P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs/SI-GaAs外延材料,其中P+-Al0.3Ga0.7As掺杂杂质为Be,掺杂浓度≥5E19cm-3,厚度为(0.5±0.1)μm;I-GaAs掺杂杂质为Si,掺杂浓度≤5E14cm-3,厚度为(4.0±0.1)μm;N+-GaAs参杂杂质为Si,掺杂浓度≥5E18cm-3,厚度为(2.0±0.1)μm;SI-GaAs衬底电阻率≥1E7Ω·cm,晶向<100>;
2)光刻掩蔽进行ICP刻蚀,刻蚀深度(5.0±0.2)μm,形成小台;
3)光刻掩蔽进行湿法腐蚀,刻蚀深度(2.5±0.2)μm,形成大台;
4)用PECVD工艺在晶圆表面淀积(10000±500)Å SiO2,(2000±100)Å Si3N4,形成复合介质钝化层;
5)光刻掩蔽,刻蚀形成N+区欧姆接触孔,蒸发欧姆接触金属AuGeNi-Au,其中AuGeNi厚度为(1000±100)Å,Au厚度为(2000±200)Å,剥离形成N+区欧姆接触电极;
6)光刻掩蔽,刻蚀形成P+区欧姆接触孔,溅射欧姆接触金属Ti-Pt-Au,其中Ti厚度为(1000±100)Å,Pt厚度为(1500±150)Å,Au厚度为(1000±100)Å,剥离形成P+区欧姆接触电极;
7)光刻掩蔽,采用电镀Au工艺形成阳极和阴极空气桥;
8)快速热处理,使P+区和N+区形成欧姆接触;
9)用PECVD工艺在晶圆表面淀积(1000±100)Å Si3N4,保护晶片表面和空气桥部分,光刻掩蔽刻蚀形成金梁窗口;
10)溅射TiAuTi,进行光刻掩蔽,电镀形成金梁,并湿法去除金梁外金属;
11)减薄晶片,将晶片机械减薄至(100±10)μm;
12)采用双面对准光刻工艺进行背面光刻胶掩蔽,进行GaAs背孔工艺,干法刻蚀图形外GaAs和复合介质层;
13)分离管芯;
GaAs基梁式引线PIN二极管是采用P+-Al0.3Ga0.7As/I-GaAs/N+-GaAs异质结PIN结构制作的。
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