CN104916731A - 一种低损伤的铟镓砷探测器p+n结制备方法 - Google Patents
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Abstract
本发明公开了一种低损伤的铟镓砷探测器p+n结制备方法,具体步骤如下:1)淀积氮化硅成结掩膜,2)光敏区成结,3)取样清洗,4)氮气氛围热处理,5)去表面损伤层。其优点在于:氮气氛围热处理一方面能够修复成结过程引入的晶格损伤,减小复合中心的密度,降低探测器的暗电流,另一方面能够激活受主离子,降低施主补偿作用,增加P区的空穴载流子浓度,有利于P电极欧姆接触的稳定性,减小串联电阻;去表面损伤层一方面可以有效去除表面氧化层,减少表面的复合中心,有利于表面钝化,提高探测器的性能,另一方面可以去除表面形成的离子富集层和表层损伤层。
Description
技术领域
本发明是关于红外探测器的制备技术,具体是指一种低损伤的铟镓砷探测器p+n结制备方法,它适用于制备高性能的短波红外铟镓砷探测器。
背景技术
在近室温环境下,短波红外铟镓砷探测器就拥有良好的性能,这使得其在民用、军事和航空航天领域有着广泛的应用价值。在铟镓砷短波红外探测器芯片的制备工艺中,p+n结的制备是最关键的工艺之一。因为成结工艺能给芯片带入比较大的损伤,所以,对短波红外铟镓砷探测器来说,优化成结方法对实现高性能、高可靠性等方面有着至关重要的作用。
铟镓砷探测器芯片的剖面结构如附图3所示,它由InP衬底1、InP缓冲层2、InGaAs吸收层3、InP帽层4、光敏区5、氮化硅钝化层6、P电极7和接触电极8组成。
目前,铟镓砷探测器的工艺主要包含6个大步骤:步骤1.在外延片上制备光敏区成结掩膜;步骤2.实施光敏区成结工艺技术;步骤3.通过刻蚀在外延片上开N槽;步骤4.进行钝化膜淀积;步骤5.在P区表面生长P电极;步骤6.在N区表面和P电极上制备接触电极。其中光敏区成结工艺是最关键的工艺步骤之一,成结的质量会直接影响到芯片的性能。因为P区基体里的离子元素也并非完全激活的状态,如图3所示,这些非激活状态包括元素离子的富集7、填隙原子8、以及电中性的化合物10等,这些状态不仅会抑制元素的激活,降低P区空穴载流子浓度,而且会给外延材料引入多的杂质缺陷和较大的晶格损 伤。此外,由于在样品表层富集大量的元素离子,这一方面会使得样品的表面受到比较大的晶格损伤;另一方面增加表面的非辐射复合中心密度。这些问题都会限制探测器性能的提高,因此需要在技术上做出进一步的改进和创新。
发明内容
基于上述探测器芯片制备工艺中存在的问题,本发明提出了一种低损伤的铟镓砷探测器p+n结制备方法,不仅能够解决了元素离子激活低,成结损伤偏大和电极串联电阻偏大的问题,而且增加了采用湿法腐蚀去除表面损伤的工艺,起到了去除离子富集层,减少复合中心,降低表面态密度,增强了后续钝化膜的钝化效果。
本发明所涉及的关键步骤有:1)淀积氮化硅成结掩膜,2)光敏区成结,
3)取样清洗,4)氮气氛围热处理,5)去表面损伤层,如附图2所示。具体工艺流程步骤如下:
1.淀积氮化硅扩散掩膜5,采用等离子体增强化学气相淀积(PECVD)技术淀积厚度200±30nm的氮化硅扩散掩膜5,衬底温度为330±20℃、RF功率为40±10W;
2.先采用感应耦合等离子体(ICP)刻蚀技术开窗口6,依次将元素离子源11、外延片12放入石英腔13源区和样品区,如图1所示,抽真空至3×10-4Pa以下,然后密封石英腔13,在550±20℃温度内,保持9±3min后,快速取出;
3.取样清洗,打开石英腔13,取出外延片12,然后用三氯甲烷、乙醚、丙酮、MOS级乙醇清洗,并用高纯氮气吹干。
4.氮气氛围热处理,将样品12放入热退火炉中,保持3~10L/min的氮气流量,在启动加热之前,对退火炉充氮气30~120秒,然后在充足的氮气氛围下加热进行热处理,热处理条件:温度为420~500℃,时间为5~15分钟;
5.表面去扩散损伤层,采用湿法腐蚀,腐蚀液为体积比为15~25%的盐酸溶液,在室温条件下,腐蚀时间为2~6分钟;
本发明的优点在于:
A.成结工艺之后,适当的氮气氛围热处理能够激活受主离子元素,抑制补偿作用,增加P区的空穴载流子浓度,有利于降低器件的串联电阻,实现P电极欧姆接触的稳定性。
B.成结工艺之后,适当的氮气氛围热处理能够修复成结引入的体内和表面的晶格损伤,降低非辐射复合中心密度,有利于抑制暗电流的产生,为高性能线列和面阵探测器的研制提供良好的工艺基础;
C.表面去损伤层,会除去表面的杂质离子富集层或表面反型层,降低表面的非辐射复合中心密度,降低器件的表面态密度,抑制表面复合电流的产生,增强了后续的钝化效果。
附图说明
图1为本发明的石英腔体的横断界面图。
图2为本发明的铟镓砷探测器芯片成结技术流程图。
图3为本发明实施的样品的剖面结构示意图。
图中:
1——半绝缘InP衬底;
2——N型InP层;
3——铟镓砷本征吸收层;
4——N型InP帽层;
5——成结掩膜;
6——窗口;
7——离子富集层;
8——填隙原子;
9——替位原子;
10——杂质离子化合物;
11——元素离子源;
12——外延片;
13——石英腔;
具体实施方式
下面结合附图对本发明的具体实施方法作详细的说明。
如附图3所示,本实施例所用的外延片为采用金属有机化学气相沉积(MOCVD)技术,在厚度为350μm的半绝缘InP衬底1上,依次生长的InP缓冲层2,InGaAs吸收层3,InP帽层4。如图2所示,本实施例探测器芯片p+n结制备方法的具体工艺流程为:
实施例1
1.淀积氮化硅扩散掩膜5,采用等离子体增强化学气相淀积(PECVD)技术淀积厚度200±30nm的氮化硅成结掩膜5,衬底温度为330±20℃、RF功率为40±10W;
2.先采用感应耦合等离子体(ICP)刻蚀技术开窗口6,依次将元素离子源11、外延片12放入石英腔13源区和样品区,如图1所示,抽真空至3×10-4Pa以下,然后密封石英腔13,在550±20℃温度内,保持9±3min后,快速取出;
3.取样清洗,打开石英腔13,取出外延片12,然后用三氯甲烷、乙醚、丙酮、MOS级乙醇清洗,并用高纯氮气吹干。
4.氮气氛围热处理,将样品12放入热退火炉中,保持10L/min的氮气流 量,在启动加热之前,对退火炉充氮气30秒,然后在充足的氮气氛围下加热进行热处理,热处理条件:温度为420℃,时间为15分钟;
4.表面去扩散损伤层,采用湿法腐蚀,腐蚀液为体积比为15%的盐酸溶液,在室温条件下,腐蚀时间为6分钟;
实施例2
1.淀积氮化硅扩散掩膜5,采用等离子体增强化学气相淀积(PECVD)技术淀积厚度200±30nm的氮化硅成结掩膜5,衬底温度为330±20℃、RF功率为40±10W;
2.先采用感应耦合等离子体(ICP)刻蚀技术开窗口6,依次将元素离子源11、外延片12放入石英腔13源区和样品区,如图1所示,抽真空至3×10-4Pa以下,然后密封石英腔13,在550±20℃温度内,保持9±3min后,快速取出;
3.取样清洗,打开石英腔13,取出外延片12,然后用三氯甲烷、乙醚、丙酮、MOS级乙醇清洗,并用高纯氮气吹干。
4.氮气氛围热处理,将样品12放入热退火炉中,保持6.5L/min的氮气流量,在启动加热之前,对退火炉充氮气80秒,然后在充足的氮气氛围下加热进行热处理,热处理条件:温度为470℃,时间为10分钟;
5.表面去扩散损伤层,采用湿法腐蚀,腐蚀液为体积比为20%的盐酸溶液,在室温条件下,腐蚀时间为4分钟;
实施例3
1.淀积氮化硅扩散掩膜5,采用等离子体增强化学气相淀积(PECVD)技术淀积厚度200±30nm的氮化硅成结掩膜5,衬底温度为330±20℃、RF功率为40±10W;
2.先采用感应耦合等离子体(ICP)刻蚀技术开窗口6,依次将元素离子源 11、外延片12放入石英腔13源区和样品区,如图1所示,抽真空至3×10-4Pa以下,然后密封石英腔13,在550±20℃温度内,保持9±3min后,快速取出;
3.取样清洗,打开石英腔13,取出外延片12,然后用三氯甲烷、乙醚、丙酮、MOS级乙醇清洗,并用高纯氮气吹干。
4.氮气氛围热处理,将样品12放入热退火炉中,保持3L/min的氮气流量,在启动加热之前,对退火炉充氮气120秒,然后在充足的氮气氛围下加热进行热处理,热处理条件:温度为500℃,时间为5分钟;
5.表面去扩散损伤层,采用湿法腐蚀,腐蚀液为体积比为25%的盐酸溶液,在室温条件下,腐蚀时间为2分钟。
Claims (1)
1.一种低损伤的铟镓砷探测器p+n结制备方法,具体方法步骤如下:1)淀积氮化硅成结掩膜,2)光敏区成结,3)取样清洗,4)氮气氛围热处理,5)去表面损伤层,其特征在于:
步骤4)中所述的氮气氛围热处理方法为:将样品放入热退火炉中,保持3~10L/min的氮气流量,在启动加热之前,对退火炉充氮气30~120秒,然后在充足的氮气氛围下加热进行热处理,热处理条件:温度为420~500℃,时间为5~15分钟;
步骤5)中所述的去表面损伤层的方法如下:损伤层去除采用湿法腐蚀方法,腐蚀液为体积比为15~25%的盐酸溶液,在室温条件下,腐蚀时间为2~6分钟。
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CN107994094A (zh) * | 2017-11-22 | 2018-05-04 | 贵州振华风光半导体有限公司 | 一种改善延伸波长铟镓砷探测器刻蚀损伤的方法 |
CN111403546A (zh) * | 2019-12-17 | 2020-07-10 | 西南技术物理研究所 | 一种预沉积扩散源制备铟镓砷光电探测器芯片的扩散方法 |
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CN101170142A (zh) * | 2007-11-21 | 2008-04-30 | 中国科学院上海技术物理研究所 | 平面型铟镓砷红外焦平面探测器及制备方法 |
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CN107994094A (zh) * | 2017-11-22 | 2018-05-04 | 贵州振华风光半导体有限公司 | 一种改善延伸波长铟镓砷探测器刻蚀损伤的方法 |
CN111403546A (zh) * | 2019-12-17 | 2020-07-10 | 西南技术物理研究所 | 一种预沉积扩散源制备铟镓砷光电探测器芯片的扩散方法 |
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