CN1042776C - 用以形成抗蚀图形的方法 - Google Patents
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Abstract
一种用以形成抗蚀图形的方法,它是通过涂覆具有小厚度的主光致抗蚀图形,并然后在主光致抗蚀图形上涂覆次光致抗蚀图形而制成的。另一方面,抗蚀图形可通过涂覆主光致抗蚀膜,将主光致抗蚀膜曝光以在主光致抗蚀膜上限定曝光区,在主光致抗蚀膜上涂覆次光致抗蚀膜,将次光致抗蚀膜曝光以在次光致抗蚀膜上限定曝光区,和将所得结构显影以形成主和次光致抗蚀图形而制成。该方法获得了光的对比度的改善,由此获得了具有垂直构形的抗蚀图形。
Description
本发明涉及一种在半导体器件制造中用以形成抗蚀图形(resist patttern)的方法,特别是,涉及一种用以形成具有垂直构形的抗蚀图形的方法。
在使用常用的单层抗蚀剂和三层抗蚀剂方法形成有抗蚀图形的地方,由于放置在抗蚀图形下或层下的衬底对光的反射作用,会在抗蚀图形的侧壁上出现凹缺,这种凹缺的结果会出现抗蚀图形不具有垂直构形的问题。
图1表示根据一种常用方法对一抗蚀膜进行曝光。如图1中所示,将光致抗蚀膜34涂覆在一衬底上或层35下,当通过掩模32对光致抗蚀膜34进行曝光31时,透射到光致抗蚀膜34上的光被衬底35的表面反射,然后其再被光致抗蚀膜34的上表面反射,结果,由于上述的不规则反射,使光致抗蚀膜34的非暴露部分不期望地被曝光36,这导致了凹缺现象,使光致抗蚀膜图形的侧壁被局部地去掉。
在通过将光致抗蚀膜涂覆在形成有另一种图形的衬底上而形成抗蚀图形并然后通过使用曝光和显影工艺而将光致抗蚀膜构图的地方,由于在图形下的拓扑会出现凹缺,换句话说,光致抗蚀膜图形会在其侧壁上局部地被去掉。
通常,用以获得微型图形的光致抗蚀膜是具有低粘度和高光敏度的抗蚀膜,由于这些特性,就难以使该光致抗蚀膜具有大的厚度,而使用具有小厚度的光致抗蚀膜作为掩模来将金属层构图是不可能的。为了增加光致抗蚀膜的厚度,已经提出了一种涂覆双层抗蚀剂的方法。
图6表示一种常用的涂覆双层抗蚀剂的方法。根据该方法,在硅衬底44上通过将液相光致抗蚀剂材料46由一喷嘴41涂覆到安装在旋涂机主轴45上的衬底44上同时转动硅衬底44而形成主光致抗蚀膜43,如图6中所示,在主光致抗蚀膜43上涂覆次光致抗蚀膜42。
在涂覆次光致抗蚀膜42过程中,主光致抗蚀膜43上表面由包含在用于次光致抗蚀膜42材料中的溶剂所溶解,由此,使在主光致抗蚀膜43和次光致蚀膜42之间的界面变糙,结果,使主和次光致抗蚀膜的厚度的均匀性下降。当光致抗蚀膜厚度较厚时,所得抗蚀图形的分辨率降低,这是由于光致抗蚀膜所不期望的大的厚度导致了对于聚焦深度的限制,而其使得减小的曝光设备的工艺裕度变小了。
因此,本发明的目的就是为了解决图1中所示的采用常用方法所遇到的问题,并且提供一种形成具有垂直构型的抗蚀图形的方法,它是通过吸收来自下衬底表面的反射光来形成薄的主光致抗蚀图形。
本发明的另一目的就是为了解决图6中所示的采用常用方法所遇到的问题,并且提供一种形成具有优良构形的抗蚀图形的方法,它是通过涂覆主光致抗蚀膜,将主光致抗蚀膜曝光,在主光致抗蚀膜上涂覆抗反射层,在抗反射层上涂覆次光致抗蚀膜,将次光致抗蚀膜曝光,和将所得结构显影,以形成主和次抗蚀图形。
根据本发明的一方面,本发明提供一种用以形成抗蚀图形的方法,它包括下列步骤:在一下层上涂覆具有小厚度的主光致抗蚀膜,优选地,所述主致抗蚀膜不大于1000;使用一掩模将主光致抗蚀膜曝光,然后将主光致抗蚀膜显影,由此形成主光致抗蚀图形;在所得结构的整个露出表面上形成中间层;在中间层上涂覆次光致抗蚀膜,使用与主光致抗蚀膜所用相同的掩模将次光致抗蚀膜曝光,然后将次光致抗蚀膜显影,由此形成次光致抗蚀图形;并且蚀刻通过次光致抗蚀图形所露出的一部分中间层,以保护主致抗蚀膜,形成完全与主光致抗蚀图形相重叠的次光致抗蚀图形,使得所得抗蚀图形具有垂直构形。
根据本发明的另一方面,本发明提供一种用以形成抗蚀图形的方法,它包括下列步骤:在下层上涂覆主光致抗蚀膜,使用一掩模将主光致抗蚀膜曝光,由此在主光致抗蚀膜上限定了曝光区;在主光致抗蚀膜上形成具有小的厚度的抗反射层,优选地,抗反射层的厚度为几百到几千埃,而且,抗反射层可由可显示高吸光性并可溶解在显影步骤中所用显影剂所包含的H2O中的材料制成,更优选地,抗反射层的厚度为100到10,000;在抗反射层涂覆次光致抗蚀膜,并使用与主光致抗蚀膜所用相同的掩模将次光致抗蚀膜曝光,由此在次光致抗蚀膜上限定了曝光区;和将所得结构显影,由此去掉了主和次光致抗蚀膜以及抗反射层分别对应于曝光区的各部分,使得所得抗蚀图形具有垂直构形。
本发明的其它目的和各方面将通过参照附图对下列实施例的描述而更加清楚,其中:
图1是一截面图,它表示根据常用方法对抗蚀膜的曝光;
图2至5是截面图,其分别地表示根据本发明的第一实施例在用的形成抗蚀图形的方法中所包含的顺序步骤;
图6是一截面图,它表示一种常用的涂覆双层抗蚀剂的方法;
图7至10是截面图,其分别地表示根据本发明的第二实施例在用以形成抗蚀图形的方法中所包含的顺序步骤;和
图11是一截面图,它表示根据本发明的第三实施例所形成的一种多层抗蚀结构。
图2至5分别地表示根据本发明的第一实施例在用以形成抗蚀图形的方法中所包含的顺序步骤。
根据该方法,在一衬底5上涂覆薄的主光致抗蚀膜7,如图2所示,然后使用一掩模2将主光致抗蚀膜7曝光,由此形成曝光区8。
主光致抗蚀膜7具有不大于1000的小的厚度以获得聚焦深度的改善。因此,即使在使用小的曝光能量时,也可以获得抗蚀图形分辩率的改善。然而,使用具有这种小的厚度的主光致抗蚀膜作为令人满意的蚀刻掩模用于蚀刻放置在主光致抗蚀膜下的下层的步骤是困难的。
因此,使用显影工艺将主光致抗蚀膜7在其对应于曝光区8的部分上局部地去掉,由于形成主光致抗蚀图形7′。如图3中所示,然后在150℃到300℃湿度范围内完成硬烘焙,以固化主光致抗蚀图形7′。在所得结构上,淀积中间层10至小的厚度,如在500至2,000的范围内,采用中间层10为了防止主光致抗蚀图型7′在连续步骤中在涂覆次光致抗蚀膜下被损坏。中间层10是由旋涂玻璃(SOG)或等离子增强氧化物制成,中间层10还可以由抗反射涂覆材料制成,该材料不是任何金属材料,而是一种具有象聚乙烯醇那样的高透明材料。然后在中间层10上涂覆次光致抗蚀膜9,使用在图2步骤中所用掩模2,将次光致抗蚀膜9曝光1。
由于有了这种结构,使由曝光而产生的反射光11的作用被减小,从而获得对比度的改善,换句话说,透射到次光致抗蚀膜9上的光通过衬底10的表面反射,然后再通过次光致抗蚀膜9的表面反射,然后所反射的光被吸收入主光致抗蚀图形7′中,由此减小了次光致抗蚀膜9在其非曝光部分被反射光曝光的问题。
次光致抗蚀膜9的厚度是通过待构成图形的层下的厚度确定的,也就是说,放置在次光致抗蚀膜9下的层。
图4表示在曝光步骤过程中在次光致抗蚀膜9上所限定的曝光区3。
然后将所得结构显影以去掉次光致抗蚀膜9的曝光部分3,由此形成次光致抗蚀图形9′,如图5中所示,此后,将中间层10在其通过次光致抗蚀图形9′所露出部分上进行局部蚀刻,结果,形成具有垂直构形的抗蚀图形。
另一方面,图7至10表示根据本发明的第二实施例在一种用以形成抗蚀图形的方法中所包含的顺序步骤。
根据该方法,在一硅衬底14上涂覆不大于1,000厚度的主光致抗蚀膜13,如图7中所示,然后使用掩模12将主光致抗蚀膜13曝光,由此形成曝光区20。
在所得结构上,形成一定厚度的抗反射层,例如,几百埃至几千埃,以保护主光致抗蚀膜13和曝光区20,如图8中所示。抗反射层15是由聚酰胺或其它抗反射涂覆(ARC)材料制成,其中ARC材料不溶解于主光致抗蚀膜13的材料中所包含的溶剂中,并且显示出高的光吸收性,ARC可溶解在显影剂所包含的H2O中。
然后在抗反射层15上轻轻地涂覆次光致抗蚀膜16,如图9中所示,使用在图7步骤时所用掩模18,将次光致抗蚀膜16进行曝光17,由此限定了曝光区21。
然后将所得结构进行显影以去掉次光致抗蚀膜16的曝光部分21,和分别放置在曝光部分21下的抗反射层15和主光致抗蚀膜13的各部分,结果,形成次光致抗蚀图形12′,非反射层图形15′和主光致抗蚀图形13′。
在形成各图形以后,使用在显影步骤中所用显影剂去掉抗反射层15。
第二实施例的方法包括涂覆具有小的厚度的主光致抗蚀膜,将主光致抗蚀膜曝光,在构成主光致抗蚀膜图形上涂覆次光致抗蚀膜和将次光致抗蚀膜曝光,该方法是以这样的事实为基础的,即薄的抗蚀膜可以为曝光时的聚焦深度提供充足的工艺裕度。因此,该方法可获得抗蚀图形的优良构形而不管抗蚀图形具有的大厚度。
图11表示根据本发明第三实施例所形成的多层抗蚀结构。
如图11中所示,多层抗蚀结构包括顺序地在衬底54上形成的主光致抗蚀膜55,主抗反射膜56,次光致抗蚀膜57,次抗反射膜58和第三光致抗蚀膜59。多层抗蚀膜具有7至8μm的厚度,采用与第二实施例相同的所述方式,使用相同的掩模将光致抗蚀膜曝光,因此,所得抗蚀图形具有垂直构形。
通过上面的描述可以清楚地看到,本发明的第一实施例包括在主光致抗蚀图形上形成中间层和在中间层上涂覆次光致抗蚀膜,主光致抗蚀图形可吸收在将次光致抗蚀膜曝光时不规则的反射光,由此,减少了在次光致抗蚀膜图形上出现的凹缺现象。
再有,本发明的第二实施例包括涂覆双层抗蚀层,也就是涂覆主和次光致抗蚀膜。由于借助双层抗蚀涂层可增加所得抗蚀结构的厚度,因而就可以形成具有优良构形的抗蚀图形。
虽然为图解的目的已公开了本发明的优选实施例,但本技术领域的普通专业人员将会理解,各种变型、添加和替换均是可能的,但其均不会脱离所附权利要求中所公开的发明范围和精神。
Claims (8)
1.一种用以形成抗蚀图形的方法,它包括下列步骤:
在下层上涂覆具有厚度不大于1,000的主光致抗蚀膜;
使用一掩模将主光致抗蚀膜曝光,然后将主光致抗蚀膜显影,由此形成主光致抗蚀图形;
在所得结构的整个露出表面上形成保护主光致抗蚀膜的中间层;
在中间层上涂覆次光致抗蚀膜,使用与主光致抗蚀膜所用相同的掩模将次光致抗蚀膜曝光,然后将次光致抗蚀膜显影,由此形成次光致抗蚀图形;和
蚀刻一部分通过次光致抗蚀图形所露出的中间层,由此形成完全地与主光致抗蚀图形重叠的次光致抗蚀图形,使得所得抗蚀图形具有垂直构形。
2.按照权利要求1的方法,其中中间层是由旋涂玻璃或等离子增强氧化物制成的。
3.按照权利要求1的方法,其中中间层是由一种包含有显示出高透明度的聚乙烯醇的材料制成的。
4.按照权利要求1的方法,其中次光致抗蚀膜具有足够大的厚度,它是由待构形的下层的厚度确定的。
5.按照权利要求1的方法,其中中间层具有500至2000的厚度。
6.按照权利要求1的方法,其进一步包括在主光致抗蚀图形形成以后,在150℃至300℃的温度内将主光致抗蚀图形进行硬烘焙的步骤。
7.一种用以形成抗蚀图形的方法,它包括下列步骤:
在下层上涂覆主光致抗蚀膜,使用掩模将主光致抗蚀膜曝光,由此在主光致抗蚀膜上限定了曝光区;
在主光致抗蚀膜上形成具有几百到几千埃厚度的抗反射层,其中抗反射层是由可显示高吸光性并可溶解在显影步骤中所用显影剂所包含的H2O中的材料制成;
在抗反射层上涂覆次光致抗蚀膜,并使用与主光致抗蚀膜所用相同的掩模将次光致抗蚀膜曝光,由此在次光致抗蚀膜上限定了曝光区;和
将所得结构显影,由此去掉分别地对应于曝光区的主和次光致抗蚀膜以及抗反射层的各部分,使得所得抗蚀图形具有垂直构形。
8.按照权利要求7的方法,其中抗反射层的厚度是在100至1,000范围内。
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019940016978A KR0144420B1 (ko) | 1994-07-14 | 1994-07-14 | 리소그라피 공정방법 |
KR9416979 | 1994-07-14 | ||
KR1019940016979A KR0130168B1 (ko) | 1994-07-14 | 1994-07-14 | 미세 패턴 형성방법 |
KR94-16978 | 1994-07-14 | ||
KR94-16979 | 1994-07-14 | ||
KR9416978 | 1994-07-14 |
Publications (2)
Publication Number | Publication Date |
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CN1119340A CN1119340A (zh) | 1996-03-27 |
CN1042776C true CN1042776C (zh) | 1999-03-31 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN95108123A Expired - Fee Related CN1042776C (zh) | 1994-07-14 | 1995-07-14 | 用以形成抗蚀图形的方法 |
Country Status (5)
Country | Link |
---|---|
US (2) | US5830624A (zh) |
JP (1) | JP2731516B2 (zh) |
CN (1) | CN1042776C (zh) |
DE (1) | DE19525745B4 (zh) |
GB (1) | GB2291207B (zh) |
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US6962770B2 (en) * | 2000-09-14 | 2005-11-08 | Canon Kabushiki Kaisha | Method of manufacturing an electroconductive film, and an apparatus including it |
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US6686132B2 (en) * | 2001-04-20 | 2004-02-03 | The Regents Of The University Of California | Method and apparatus for enhancing resist sensitivity and resolution by application of an alternating electric field during post-exposure bake |
DE10127888A1 (de) * | 2001-06-08 | 2002-12-19 | Infineon Technologies Ag | Verfahren zur Bildung von Kontaktregionen von in einem Substrat integrierten Bauelementen |
JP3830777B2 (ja) * | 2001-06-14 | 2006-10-11 | 富士通株式会社 | 半導体装置の製造方法 |
KR100445004B1 (ko) * | 2002-08-26 | 2004-08-21 | 삼성전자주식회사 | 모노리틱 잉크 젯 프린트 헤드 및 이의 제조 방법 |
US20040077173A1 (en) * | 2002-10-17 | 2004-04-22 | Swaminathan Sivakumar | Using water soluble bottom anti-reflective coating |
US8993221B2 (en) * | 2012-02-10 | 2015-03-31 | Pixelligent Technologies, Llc | Block co-polymer photoresist |
DE10309266B3 (de) * | 2003-03-04 | 2005-01-13 | Infineon Technologies Ag | Verfahren zum Bilden einer Öffnung einer Licht absorbierenden Schicht auf einer Maske |
US7229745B2 (en) * | 2004-06-14 | 2007-06-12 | Bae Systems Information And Electronic Systems Integration Inc. | Lithographic semiconductor manufacturing using a multi-layered process |
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JP5138916B2 (ja) * | 2006-09-28 | 2013-02-06 | 東京応化工業株式会社 | パターン形成方法 |
US8236592B2 (en) * | 2007-01-12 | 2012-08-07 | Globalfoundries Inc. | Method of forming semiconductor device |
JP4560066B2 (ja) * | 2007-06-11 | 2010-10-13 | 株式会社東芝 | パターン形成方法 |
US20100003623A1 (en) * | 2008-07-03 | 2010-01-07 | United Microelectronics Corp. | Method of patterning multiple photosensitive layers |
US8466000B2 (en) | 2011-04-14 | 2013-06-18 | United Microelectronics Corp. | Backside-illuminated image sensor and fabricating method thereof |
US20130010165A1 (en) | 2011-07-05 | 2013-01-10 | United Microelectronics Corp. | Optical micro structure, method for fabricating the same and applications thereof |
US9312292B2 (en) | 2011-10-26 | 2016-04-12 | United Microelectronics Corp. | Back side illumination image sensor and manufacturing method thereof |
CN102354087A (zh) * | 2011-11-03 | 2012-02-15 | 中国科学院半导体研究所 | 一种提高光刻胶曝光精度的方法 |
US8318579B1 (en) | 2011-12-01 | 2012-11-27 | United Microelectronics Corp. | Method for fabricating semiconductor device |
US8815102B2 (en) | 2012-03-23 | 2014-08-26 | United Microelectronics Corporation | Method for fabricating patterned dichroic film |
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US8871596B2 (en) | 2012-07-23 | 2014-10-28 | International Business Machines Corporation | Method of multiple patterning to form semiconductor devices |
US8828779B2 (en) | 2012-11-01 | 2014-09-09 | United Microelectronics Corp. | Backside illumination (BSI) CMOS image sensor process |
US8779484B2 (en) | 2012-11-29 | 2014-07-15 | United Microelectronics Corp. | Image sensor and process thereof |
US9279923B2 (en) | 2013-03-26 | 2016-03-08 | United Microelectronics Corporation | Color filter layer and method of fabricating the same |
US9537040B2 (en) | 2013-05-09 | 2017-01-03 | United Microelectronics Corp. | Complementary metal-oxide-semiconductor image sensor and manufacturing method thereof |
US9129876B2 (en) | 2013-05-28 | 2015-09-08 | United Microelectronics Corp. | Image sensor and process thereof |
US9054106B2 (en) | 2013-11-13 | 2015-06-09 | United Microelectronics Corp. | Semiconductor structure and method for manufacturing the same |
US9841319B2 (en) | 2013-11-19 | 2017-12-12 | United Microelectronics Corp. | Light detecting device |
CN104332393B (zh) * | 2014-10-17 | 2017-01-25 | 中国航天科技集团公司第九研究院第七七一研究所 | 一种制备tsv立体集成rdl电镀掩膜的厚胶工艺 |
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- 1995-07-12 GB GB9514185A patent/GB2291207B/en not_active Expired - Fee Related
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- 1995-07-14 JP JP7178613A patent/JP2731516B2/ja not_active Expired - Fee Related
- 1995-07-14 DE DE19525745A patent/DE19525745B4/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
CN1119340A (zh) | 1996-03-27 |
GB2291207A (en) | 1996-01-17 |
GB2291207B (en) | 1998-03-25 |
JPH08190203A (ja) | 1996-07-23 |
JP2731516B2 (ja) | 1998-03-25 |
US5989788A (en) | 1999-11-23 |
DE19525745A1 (de) | 1996-01-18 |
US5830624A (en) | 1998-11-03 |
DE19525745B4 (de) | 2006-04-13 |
GB9514185D0 (en) | 1995-09-13 |
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