CN110491777B - 一种双沟结构的脊上开孔方法 - Google Patents
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Abstract
本发明涉及一种双沟结构的脊上开孔方法,包括如下步骤:在具有双沟的晶元上生长二氧化硅钝化层;匀胶负性光刻胶两次,进行前烘;准备好所需光刻版,将晶元对位曝光;将曝光后的晶元进行曝光后烘;将晶元泛曝光,进行显影;在显微镜下检验合格后,后烘;匀胶负性光刻胶一次,进行前烘;准备好所需光刻版,且晶元对位曝光预设时间;将曝光后的晶元进行曝光后烘;将晶元泛曝光,进行显影;在显微镜下检验合格后,后烘;将后烘后的晶元送到RIE刻蚀机进行刻蚀;将刻蚀后的晶元进行去胶清洗。本发明采用两次负胶反转光刻工艺和一次RIE刻蚀结合,减小对位难度并且能够有效保护台面边缘的二氧化硅钝化层,使得台面开孔区域形貌优良,便于电流注入。
Description
技术领域:
本发明涉及一种双沟结构的脊上开孔方法。
背景技术:
目前,脊上开孔采用的光刻方式为正胶一次光刻,这种开孔的方式光刻版透光部分比较小,视野比较小,不利于对位曝光并且由于双沟腐蚀深度比较深,在台面边缘的光刻胶会往双沟里面填充,导致边缘胶厚不够,二氧化硅钝化层被刻蚀,不能有效的起到钝化作用。
发明内容:
本发明针对上述现有技术存在的问题做出改进,即本发明所要解决的技术问题是提供一种双沟结构的脊上开孔方法,设计合理,克服现有的工艺导致的台面边缘胶层过薄的问题。
为了实现上述目的,本发明采用的技术方案是:一种双沟结构的脊上开孔方法,包括如下步骤:
步骤S1:在具有双沟形貌结构的晶元上生长二氧化硅钝化层;
步骤S2:在二氧化硅钝化层上匀胶负性光刻胶两次,进行前烘;
步骤S3:准备好开孔所需要的光刻版,并且将步骤S2中前烘后的晶元对位曝光预设时间;
步骤S4:将步骤S3中对位曝光后的晶元进行曝光后烘预设时间;
步骤S5:将步骤S4中曝光后烘后的晶元泛曝光预设时间,然后进行显影;
步骤S6:将步骤S5中显影后的晶元在显微镜下检验合格后,后烘预设时间;
步骤S7:将步骤S6中后烘后的晶元匀胶负性光刻胶一次,进行前烘;
步骤S8:准备好开孔所需要的光刻版,并且将步骤S7中前烘后的晶元对位曝光预设时间;
步骤S9:将步骤S8中对位曝光后的晶元进行曝光后烘预设时间;
步骤S10:将步骤S9中曝光后烘后的晶元泛曝光预设时间,然后进行显影;
步骤S11:将步骤S10中显影后的晶元在显微镜下检验合格后,后烘预设时间;
步骤S12:将步骤S11中后烘后的晶元送到RIE刻蚀机进行刻蚀;
步骤S13:将刻蚀后的晶元进行去胶清洗。
进一步的,在步骤S1中,二氧化硅钝化层的厚度为4000Å。
进一步的,在步骤S3和步骤S8中,对位曝光的时间为3s。
进一步的,在步骤S4和步骤S9中,曝光后烘的时间为60s。
进一步的,在步骤S5和S10中,泛曝光的时间为60s。
进一步的,在步骤S6和步骤S11中,后烘时间为5min。
进一步的,在步骤S12中,通入四氟化碳气体进行刻蚀,将电流注入区域制备出来。
进一步的,在步骤S2和步骤S7中,负性光刻胶采用AZ5214。
与现有技术相比,本发明具有以下效果:本发明采用两次负胶反转光刻工艺和一次RIE刻蚀工艺相结合,可减小对位难度并且能够有效保护台面边缘的二氧化硅钝化层,使得台面开孔区域形貌优良,便于电流注入。
附图说明:
图1是本发明实施例中生长二氧化硅钝化层后的构造示意图;
图2是本发明实施例中两次光刻后的构造示意图;
图3是本发明实施例中RIE刻蚀后的构造示意图;
图4是本发明实施例中去胶清洗后的构造示意图;
图5是本发明实施例中去胶清洗后的俯视图。
图中:
1-晶元;2-二氧化硅钝化层;3-双沟结构;4-负性光刻胶;5-台面边缘;6-开孔区域。
具体实施方式:
下面结合附图和具体实施方式对本发明做进一步详细的说明。
如图1~5所示,本发明一种双沟结构的脊上开孔方法,在具有双沟形貌的晶元上,先进行两次光刻,然后用RIE刻蚀,刻蚀出光刻开孔区域,再经过去胶清洗形成了图5所示的形貌,具体包括如下步骤:
步骤S1:在具有双沟形貌结构的晶元上生长厚度为4000Å的二氧化硅钝化层,如图1所示;
步骤S2:在二氧化硅钝化层上匀胶负性光刻胶两次,进行前烘;
步骤S3:准备好开孔所需要的光刻版,并且将步骤S2中前烘后的晶元对位曝光3s;
步骤S4:将步骤S3中对位曝光后的晶元进行曝光后烘60s;
步骤S5:将步骤S4中曝光后烘后的晶元泛曝光60s,然后进行显影;
步骤S6:将步骤S5中显影后的晶元在显微镜下检验合格后,后烘5min;
步骤S7:将步骤S6中后烘后的晶元匀胶负性光刻胶一次,进行前烘,如图2所示;
步骤S8:准备好开孔所需要的光刻版,并且将步骤S7中前烘后的晶元对位曝光3s;
步骤S9:将步骤S8中对位曝光后的晶元进行曝光后烘60s;
步骤S10:将步骤S9中曝光后烘后的晶元泛曝光60s,然后进行显影;
步骤S11:将步骤S10中显影后的晶元在显微镜下检验合格后,后烘5min;
步骤S12:将步骤S11中后烘后的晶元送到RIE刻蚀机,通入四氟化碳气体进行刻蚀,将电流注入区域制备出来,如图3所示;
步骤S13:将刻蚀后的晶元进行去胶清洗,如图4所示。
本实施例中,在步骤S2和步骤S7中,负性光刻胶采用AZ5214。
本发明采用两次负胶反转光刻工艺和一次RIE刻蚀工艺,第一次光刻匀胶AZ5214(负胶)两次,进行对位曝光、PEB、泛曝光、显影和后烘。第二次光刻在第一次的基础上,匀胶AZ5214一次,进行对位曝光、PEB、泛曝光、显影和后烘。一次RIE刻蚀,通过通入四氟化碳气体对二氧化硅钝化层开孔部分进行刻蚀,将电流注入区域制备出来。这种两次光刻工艺方法克服现有的工艺导致的台面边缘胶层过薄,并且常规的一次正胶光刻,透光部分太小不利于对位曝光的问题,能够有效的提高台面边缘的胶厚,并且反转工艺采用的光刻版透光部分大,只有开孔处的几微米部分不透光,容易观察晶片表面状况以及实现对位操作
本发明的优点在于:既使得增大了对位透光区,减小对位难度,又加厚了台面边缘胶厚,使其满足刻蚀需求,制备出的开孔区域形貌优良,便于电流注入。
以上所述仅为本发明的较佳实施例,凡依本发明申请专利范围所做的均等变化与修饰,皆应属本发明的涵盖范围。
Claims (8)
1.一种双沟结构的脊上开孔方法,其特征在于:包括如下步骤:
步骤S1:在具有双沟形貌结构的晶元上生长二氧化硅钝化层;
步骤S2:在二氧化硅钝化层上匀胶负性光刻胶两次,进行前烘;
步骤S3:准备好开孔所需要的光刻版,并且将步骤S2中前烘后的晶元对位曝光预设时间;
步骤S4:将步骤S3中对位曝光后的晶元进行曝光后烘预设时间;
步骤S5:将步骤S4中曝光后烘后的晶元泛曝光预设时间,然后进行显影;
步骤S6:将步骤S5中显影后的晶元在显微镜下检验合格后,后烘预设时间;
步骤S7:将步骤S6中后烘后的晶元匀胶负性光刻胶一次,进行前烘;
步骤S8:准备好开孔所需要的光刻版,并且将步骤S7中前烘后的晶元对位曝光预设时间;
步骤S9:将步骤S8中对位曝光后的晶元进行曝光后烘预设时间;
步骤S10:将步骤S9中曝光后烘后的晶元泛曝光预设时间,然后进行显影;
步骤S11:将步骤S10中显影后的晶元在显微镜下检验合格后,后烘预设时间;
步骤S12:将步骤S11中后烘后的晶元送到RIE刻蚀机进行刻蚀;
步骤S13:将刻蚀后的晶元进行去胶清洗。
2.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S1中,二氧化硅钝化层的厚度为4000Å。
3.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S3和步骤S8中,对位曝光的时间为3s。
4.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S4和步骤S9中,曝光后烘的时间为60s。
5.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S5和S10中,泛曝光的时间为60s。
6.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S6和步骤S11中,后烘时间为5min。
7.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S12中,通入四氟化碳气体进行刻蚀,将电流注入区域制备出来。
8.根据权利要求1所述的一种双沟结构的脊上开孔方法,其特征在于:在步骤S2和步骤S7中,负性光刻胶采用AZ5214。
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CN104538348A (zh) * | 2015-01-19 | 2015-04-22 | 京东方科技集团股份有限公司 | 过孔和显示基板的制作方法 |
CN106449398A (zh) * | 2016-10-27 | 2017-02-22 | 安徽富芯微电子有限公司 | 减少光刻湿法腐蚀钻蚀的工艺方法 |
CN107257082A (zh) * | 2017-07-05 | 2017-10-17 | 青岛海信宽带多媒体技术有限公司 | 一种脊波导激光器电极接触窗口的制作方法 |
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