CN104064611B - 基于微纳米结构的Si-APD光电探测器及其制备方法 - Google Patents
基于微纳米结构的Si-APD光电探测器及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种基于微纳米结构的Si‑APD光电探测器及其制备方法,属于光电探测技术领域,其包括P型Si衬底(1)、位于P型Si衬底(1)中心上方的微纳米结构硅层N+区(2)、位于P型Si衬底(1)两侧上方的保护环区即N区(3)、设置在微纳米结构硅层N+区(2)和N区(3)上表面的上端电极(4)以及位于P型Si衬底(1)下表面的下端电极(5);所述微纳米结构硅层N+区(2)的深度小于保护环区即N区(3)的深度。本发明解决了传统Si‑APD光电探测器响应度较低、无法响应近红外波段等问题,可使响应波段扩展到近红外波段,响应度更高。
Description
技术领域
本发明属于光电探测技术领域,涉及光电探测器件结构,尤其涉及一种基于微纳米结构的Si-APD光电探测器及其制备方法。
背景技术
光电探测器作为光纤通讯系统、红外成像系统、激光告警系统和激光测距系统等的重要组成部分,在民用和军用方面均得到了广泛的应用。APD是一种具有内增益能力的光探测器,具有很高的灵敏度,被广泛地应用在超高速光通信、信号处理、测量和传感系统中。APD是现代高比特速率光通信系统广泛使用的光电探测器,以其体积小、测量波段范围宽以及在近红外波段有较高灵敏度等一系列的优点,已大量用于弱光场测量、光子计数等相关领域中。由于APD光电探测器具有较高的内增益和探测灵敏度比PIN型光二极管高的特点,因此是目前1.06μm激光测距机中最常用的优良器件。
雪崩光电二极管(APD)是一种应用广泛的光电探测器件,由于具有较高的内部增益,因而器件的灵敏度和响应度较高,主要用于弱光条件下的通信、航空、航天、航海以及医疗、安防等工业和民用领域。
传统硅基雪崩光电二极管(Si-APD)在200 nm~900 nm波长范围内的响应度较高,但硅材料的禁带宽度较大(1.12 eV),因而传统Si-APD对大于1000 nm波长光的响应度很低,一般不能用于红外波段的光探测。其它半导体材料如Ge、InGaAs等虽然可以探测红外波段的光,但这些材料的价格昂贵、热力学性能较差、信噪比低,而且器件制备工艺与现有成熟的硅工艺不兼容。Si材料具有高的碰撞电离系数比,用于光探测器时可使器件的信噪比得到提高,且工艺成熟。因而,通过某些特定的方法实现硅材料对近红外波段的吸收,扩展硅基光探测器的探测范围,意义十分重大。
微纳米结构硅是一种在晶体硅表面通过微纳米加工技术得到的具有微纳米尺度的表面硅材料,具有排列规整、分布均匀和可加工面积大等优点,其对可见光及近红外光的吸收率可达到90%以上,且由于在加工过程中可能引入的缺陷态和杂质能级等,使其光谱吸收范围相较于传统硅材料可向近红外方向拓展。
目前,能在硅晶体表面实现微纳米结构的加工方法主要有:极紫外光刻技术、电子束光刻技术、X 射线光刻、纳米压印刻蚀技术等。其中,纳米压印刻蚀方法是国内外正在研发和推广的新一代微纳米结构材料刻蚀新工艺,其基本原理是将事先制作好的微纳米结构模版通过专用压机作用于一层薄的聚合物压印胶上,这层具有良好流变性的压印胶可通过热作用或紫外光固化,经良好的脱模后在压印胶上形成与模版1:1大小的图案,从而替代传统的“光刻”工艺。该工艺通过压印胶的模压变形与固化来实现图像的转移,图像最小尺度极限主要依赖于模板的加工精度,而后者可借助最新的微纳米刻蚀技术,实现纳米量级的加工,突破了传统光刻的工艺极限,降低了对特殊曝光束源、高精度聚焦系统、极短波长透镜系统以及抗蚀剂分辨率受光波场效应的限制和要求,具有工艺重复性好、生产效率高和图形转移精度高等优点,适合产业化批量生产。现有的纳米压印刻蚀技术主要有热压印刻蚀、紫外纳米压印刻蚀和微接触纳米压印刻蚀等。
发明内容
针对上述现有技术,利用微纳米压印刻蚀工艺,本发明的目在于提供一种响应度高、响应速度快和响应光谱波段宽的基于微纳米结构的Si-APD光电探测器及制备方法。
为了达到上述目的,本发明采用如下技术方案:
一种基于微纳米结构的Si-APD光电探测器,其特征在于,包括P型Si衬底1、位于P型Si衬底1中心上方的微纳米结构硅层N+区2、位于P型Si衬底1两侧上方的保护环区即N区3、设置在微纳米结构硅层N+区2和N区3上表面的上端电极4以及位于P型Si衬底1下表面的下端电极5;所述微纳米结构硅层N+区(2)的深度小于保护环区即N区(3)的深度。
在本发明中,所述微纳米结构硅层N+区是通过磷(P)重扩散或离子注入形成的N+区,也是进行纳米压印刻蚀得到的表面呈微纳米尺度阵列化分布的微结构硅材料。
进一步地,磷扩散N区呈环形状,为环形N区。
在本发明中,微纳米结构硅层N+区呈阵列化排布,其典型尺寸为:硅微纳米柱或微纳米孔直径60~90 nm、高度或深度300~500 nm、周期100~300 nm。
所述N区3是通过磷扩散或者离子注入制备得到的,其掺杂浓度范围为1×1014 ion/cm3~2×1017 ion/cm3。
在本发明中,所述上端电极4和下端电极5为金属薄膜电极,金属材料为铝(Al)、金(Au)或金铬合金(Au/Cr)。
针对上述基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,包括如下步骤:
预备表面清洁、干燥的硅单晶片衬底材料;
将硅单晶片研磨抛光至厚度为350 μm,并在衬底正面氧化生长SiO2膜层;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N区保护环磷扩散窗口;
对刻蚀后的N区磷扩散窗口进行磷扩散或离子注入形成N区,掺杂浓度范围为1×1014 ion/cm3~2×1017 ion/cm3,结深为1.5 μm~3.5 μm,接着去除表面光刻胶;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N+区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N+区窗口;
对N+区窗口进行磷扩散或离子注入形成N+区,掺杂浓度范围为>5×1017 ion/cm3,结深为0.2 μm~3.0 μm,接着去除表面光刻胶;
对制成的硅器件进行清洗并烘干,并在N+区上均匀涂敷一层压印胶;
在真空下施加一定压力,使纳米压印模板与压印胶充分接触,填充完全后通过照射紫外光或加热使压印胶固化成形;
脱模,去除残胶层;
采用深槽反应离子刻蚀的方法,以上述固化后的压印胶为掩膜,对其下面的硅材料衬底进行各向异性刻蚀,得到相应的图形,从而形成微纳米结构硅层N+区;
上端电极和下端电极制备。
本发明的基本工作原理是:被探测目标物质所激发出的光辐射或各种反射激光被新型Si-APD光电探测器的光敏面所吸收,产生空穴电子对;空穴电子对在高电场作用下高速运动,通过碰撞电离效应,产生数量是首次空穴电子对几十倍的二次、三次新空穴电子对,从而产生很大的光信号电流。
本发明同现有技术相比,其有效果表现在:
一、由于探测器光敏面具有微纳米尺度的表面微结构,使得该器件具有较高的响应度和近红外光谱响应的特征;并且,纳米压印刻蚀技术应用于硅晶体材料表面微纳结构加工,具有微纳米结构分布均匀性好、加工重复性好以及可用于大规模生产等优势。
二、由于微纳米结构硅具有宽光谱吸收和低反射率等特征,以及探测器独特的保护环区即环形N区的存在,使得这种新型Si-APD光电探测器具有近红外光谱延伸的特征以及较高的响应度,特别能在700 nm~1200 nm波长范围内提高器件的响应度和量子效率。
三、本发明所涉及的基于微纳米结构的Si-APD光电探测器所用材料均以硅为基本材料,易于与现有硅微电子标准工艺兼容,且制备过程简单,效率高。
附图说明
图1是本发明的剖面结构示意图。
图2是本发明的俯视平面结构示意图。
附图标记:1是P型Si衬底、2是微纳米结构硅层N+区、3是N区、4是上端电极、5是下端电极。
具体实施方式
下面将结合附图及具体实施方式对本发明作进一步的描述。
如图1所示,包括P型Si衬底1、微纳米结构硅层N+区2、N区3、上端电极4及下端电极5。P型Si衬底1可采用高阻Si单晶片;N区3可采用磷扩散或离子注入;微纳米结构硅层N+区2可通过在磷扩散掺杂或离子注入形成 N+区上进行纳米压印刻蚀得到。这样制作的新型Si-APD光电探测器具有微纳米结构硅层和保护环,从而具有高响应度和近红外宽光谱响应的特性。
一种基于微纳米结构的Si-APD光电探测器,具体包括如下步骤:
预备表面清洁、干燥的硅单晶片衬底材料;
将硅单晶片研磨抛光至厚度为350 μm,并在衬底正面氧化生长SiO2膜层;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N区保护环磷扩散窗口;
对刻蚀后的N区磷扩散窗口进行磷扩散或离子注入形成N区,掺杂浓度范围为1×1014 ion/cm3~2×1017 ion/cm3,结深为1.5 μm~3.5 μm,接着去除表面光刻胶;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N+区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N+区窗口;
对N+区窗口进行磷扩散或离子注入形成N+区,掺杂浓度范围为>5×1017 ion/cm3,结深为0.2 μm~3.0 μm,接着去除表面光刻胶;
对制成的硅器件进行清洗并烘干,并在N+区上均匀涂敷一层压印胶;
在真空下施加一定压力,使纳米压印模板与压印胶充分接触,填充完全后通过照射紫外光或加热使压印胶固化成形;
脱模,去除残胶层;
采用深槽反应离子刻蚀的方法,以上述固化后的压印胶为掩膜,对其下面的硅材料衬底进行各向异性刻蚀,得到相应的图形,从而形成微纳米结构硅层N+区;
上端电极和下端电极制备。
其中,在微纳米结构硅层N+区2的制备中,微纳米结构硅呈阵列化排布,其典型尺寸为:硅微纳米柱或微纳米孔直径60~90 nm、高度(或深度)300~500 nm、周期为100~300nm。
其中,金属电极可选材料有铝Al、金Au、铬/金Cr/Au;金属沉积方法可为LPCVD、MOCVD、磁控溅射;金属电极厚度为50 nm~150 nm。该种以微纳米结构硅为光敏层的背照式Si-APD光电探测器的响应波长范围为400 nm~1200 nm,响应度范围为20 A/W~100 A/W。
以上仅是本发明众多具体应用范围中的代表性实施例,对本发明的保护范围不构成任何限制。凡采用变换或是等效替换而形成的技术方案,均落在本发明权利保护范围之内。
Claims (6)
1.一种基于微纳米结构的Si-APD光电探测器的制备方法,Si-APD光电探测器包括P型Si衬底(1)、位于P型Si衬底(1)中心上方的微纳米结构硅层N+区(2)、位于P型Si衬底(1)两侧上方的保护环区即N区(3)、设置在微纳米结构硅层N+区(2)和N区(3)上表面的上端电极(4)以及位于P型Si衬底(1)下表面的下端电极(5);所述微纳米结构硅层N+区(2)的深度小于保护环区即N区(3)的深度;
其特征在于,包括如下步骤:
预备表面清洁、干燥的硅单晶片衬底材料;
将硅单晶片研磨抛光至厚度为350 μm,并在衬底正面氧化生长SiO2膜层;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N区保护环磷扩散窗口;
对刻蚀后的N区磷扩散窗口进行磷扩散或离子注入形成N区,掺杂浓度范围为1×1014ion/cm3~2×1017 ion/cm3,结深为1.5 μm~3.5 μm,接着去除表面光刻胶;
在SiO2膜层表面旋涂上一层光刻胶,并利用掩模图形对光刻胶图形化,在SiO2膜层上光刻出N+区图形区域待刻蚀;
对已经图形化的表面区域进行刻蚀,去除未被保护的SiO2膜层形成N+区窗口;
对N+区窗口进行磷扩散或离子注入形成N+区,掺杂浓度范围为>5×1017 ion/cm3,结深为0.2 μm~3.0 μm,接着去除表面光刻胶;
对制成的硅器件进行清洗并烘干,并在N+区上均匀涂敷一层压印胶;
在真空下施加一定压力,使纳米压印模板与压印胶充分接触,填充完全后通过照射紫外光或加热使压印胶固化成形;
脱模,去除残胶层;
采用深槽反应离子刻蚀的方法,以上述固化后的压印胶为掩膜,对其下面的硅材料衬底进行各向异性刻蚀,得到相应的图形,从而形成微纳米结构硅层N+区;
上端电极和下端电极制备。
2.根据权利要求1所述的一种基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,所述微纳米结构硅层N+区是通过磷重扩散或离子注入形成的N+区,也是通过纳米压印刻蚀得到的表面呈微纳米尺度阵列化分布的微结构硅材料。
3.根据权利要求1所述的一种基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,所述磷扩散或离子注入N区呈环形状,为环形N区。
4.根据权利要求1或2所述的一种基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,微纳米结构硅层N+区呈阵列化排布,其典型尺寸为:硅微纳米柱或微纳米孔直径60~90 nm、高度或深度300~500 nm、周期100~300 nm。
5.根据权利要求1或3所述的一种基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,所述N区(3)是通过磷扩散或者离子注入制备得到的,其掺杂浓度范围为1×1014 ion/cm3~2×1017 ion/cm3。
6.根据权利要求1所述的一种基于微纳米结构的Si-APD光电探测器的制备方法,其特征在于,所述上端电极(4)和下端电极(5)为金属薄膜电极,金属材料为铝、金或金铬合金。
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