TW201350565A - 研磨用組成物 - Google Patents
研磨用組成物 Download PDFInfo
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- TW201350565A TW201350565A TW102108841A TW102108841A TW201350565A TW 201350565 A TW201350565 A TW 201350565A TW 102108841 A TW102108841 A TW 102108841A TW 102108841 A TW102108841 A TW 102108841A TW 201350565 A TW201350565 A TW 201350565A
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- TW
- Taiwan
- Prior art keywords
- polishing
- acid
- polishing composition
- phosphorus
- phase change
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims abstract description 192
- 239000000203 mixture Substances 0.000 title claims abstract description 110
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- DNYWZCXLKNTFFI-UHFFFAOYSA-N uranium Chemical compound [U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U] DNYWZCXLKNTFFI-UHFFFAOYSA-N 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- DYWSVUBJGFTOQC-UHFFFAOYSA-N xi-2-Ethylheptanoic acid Chemical compound CCCCCC(CC)C(O)=O DYWSVUBJGFTOQC-UHFFFAOYSA-N 0.000 description 1
- 229940048462 zinc phosphide Drugs 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
本發明之研磨用組成物為使用於研磨具有相變合金之研磨對象物之用途。研磨用組成物,其特徵為含有研磨粒及添加劑,前述添加劑為選自於含磷化合物之至少1種以上,且研磨用組成物之pH為7.0以上。
Description
本發明為有關適合於研磨具有相變合金之研磨對象物之研磨用組成物。
PRAM(相變隨機存取記憶體)裝置(已知亦作為雙向記憶體裝置或PCRAM裝置)中,用於電子記憶用途在絕緣性非晶質相與傳導性結晶性相之間,係利用著能電性切換之相變材料(PCM)。適合於此等用途之典型相變材料,係以週期表之各種的VIB族(硫屬化物(chalcogenide),例如Te或Po)及VB族(例如Sb)元素,與In、Ge、Ga、Sn或Ag等之1種或複數種之金屬元素之組合而被利用著。特別適合的相變材料為鍺(Ge)-銻(Sb)-碲(Te)合金(GST合金)。此等材料為依附於(depend on)加熱/冷卻速度、溫度、及時間,而可使物理狀態可逆性地變化。其他適合的合金為包含銻化銦(InSb)。PRAM裝置中的記憶資訊會依不同物理之相或狀態之傳導特性,使損失成為最小地予以保存。
作為研磨半導體基材(例如,積體電路)之含有金屬之表面之方法,已知有化學機械研磨(CMP)。在CMP所使用的研磨用組成物,典型為含有研磨粒、氧化劑、錯化劑,並有效地利用蝕刻來進行研磨。
如此般的CMP,可利用於用來製作使用相變材料的記憶裝置。然而,不似由單一成分諸如銅(Cu)或鎢(W)所成的以往的金屬層,被研磨之相變材料係將硫(S)、鈰(Ce)、鍺(Ge)、銻(Sb)、碲(Te)、銀(Ag)、銦(In)、錫(Sn)、鎵(Ga)等,以結晶相及非結晶質相為可逆性進行相變化之特定比例混合而成,大多的相變材料(例如,GST)之物理性質,相較於PCM晶片中所利用的其他材料為「軟質」之點等,由於與以往的金屬層材料之特性不同,故難以將現今用來研磨含有金屬之表面之研磨用組成物直接予以適用。
如此般狀況之中,對於適合研磨具有相變合金之研磨對象物之研磨用組成物,已進行各種之檢討。例如,專利文獻1中,係揭示一種以含有研磨粒及氮化物且具有相變合金之研磨對象物的研磨為目的之研磨用組成物。又,專利文獻2中,係揭示一種以含有研磨粒、及鐵離子或鐵螯合錯合物且具有相變合金之研磨對象物的研磨為目的之研磨用組成物。但,僅以此等發明時,作為以研磨具有相變合金之研磨對象物為目的之研磨用組成物而言為不充分,乃期待進一步的改良。
[專利文獻1]日本特開2009-016821號公報
[專利文獻2]日本特開2009-016829號公報
在此,本發明之目的,係以提供一種在研磨具有相變合金之研磨對象物之用途為可適合使用的研磨用組成物。特別是提供,一種不依附於如氧化劑及錯化劑而能夠得到高研磨速度的研磨用組成物,其中前述氧化劑及錯化劑為用來研磨以往含有金屬之表面的典型研磨用組成物中所含有者。
本發明團隊在經過精心探討後,結果發現到一種研磨用組成物,其係藉由包含研磨粒及特定添加劑,對於具有相變合金之研磨對象物可得到高研磨速度。
即,本發明之要旨為如同下述。
<1>一種研磨用組成物,其係使用於研磨具有相變合金之研磨對象物之用途之研磨用組成物,其特徵為包含研磨粒及添加劑,前述添加劑為選自於含磷化合物之至少1種以上,前述研磨用組成物之pH為7.0以上。
<2>如上述<1>之研磨用組成物,其中研磨粒為膠體
矽石。
<3>如上述<1>之研磨用組成物,其中含磷化合物為選自於含磷有機化合物之至少1種以上。
<4>如上述<1>之研磨用組成物,其中含磷化合物為選自於含磷無機化合物之至少1種以上。
<5>如上述<1>~<4>中任一項之研磨用組成物,其係使用於研磨具有GST作為相變合金之研磨對象物之用途。
<6>一種研磨方法,其特徵係使用上述<1>~<4>中任一項之研磨用組成物來研磨具有相變合金之研磨對象物之表面。
<7>一種基板之製造方法,其特徵係具有使用上述<1>~<4>中任一項之研磨用組成物來研磨具有相變合金之研磨對象物之表面之步驟。
藉由本發明,可提供一種研磨用組成物,其係能適合使用於研磨具有相變合金之研磨對象物之用途。特別是提供一種有效提昇研磨速度的研磨用組成物。
以下為說明本發明之一實施形態。
本實施形態之研磨用組成物為包含研磨粒與特定添加
劑。
此研磨用組成物為使用於研磨具有相變合金之研磨對象物之用途。相變合金,在PRAM(相變隨機存取記憶體)裝置(已知亦作為雙向記憶體裝置或PCRAM裝置)中,用於電子記憶用途在絕緣性非晶質相與傳導性結晶性相之間,係利用著能電性切換之材料。作為適合於此等用途之相變合金,係以週期表之各種的VIB族(硫屬化物,例如Te或Po)及VB族(例如Sb)元素,與In、Ge、Ga、Sn或Ag等之1種或複數種之金屬元素之組合而被利用著。特別適合的相變材料為鍺(Ge)-銻(Sb)-碲(Te)合金(GST合金)。
研磨用組成物可含有研磨粒。研磨粒可為無機粒子、有機粒子、及有機無機複合粒子中之任一種。作為無機粒子的具體例,例如可列舉出由矽石、氧化鋁、氧化鈰、氧化鈦等之金屬氧化物所構成之粒子,以及氮化矽粒子、碳化矽粒子及氮化硼粒子。作為有機粒子的具體例,例如可列舉出聚甲基丙烯酸甲酯(PMMA)粒子。當中較佳為矽石粒子,特佳為膠體矽石。
研磨粒可經表面改質。例如可將鋁、鈦或鋯等之金屬或此等的氧化物與研磨粒混合,使摻雜於研磨粒的表面而得。或是亦可為將有機酸固定化之矽石。
研磨用組成物中,研磨粒之含有量較佳為0.1質量%
以上,又較佳為0.5質量%以上,更佳為1質量%以上。隨著研磨粒的含有量增多,具有可提昇藉由研磨用組成物之研磨對象物之除去速度之優點。
研磨用組成物中,研磨粒之含有量較佳為20質量%以下,又較佳為15質量%以下,更佳為10質量%以下。隨著研磨粒的含有量減少,可抑制研磨用組成物的材料成本,並且不易引起研磨粒的凝聚。此外,藉由使用研磨用組成物來研磨研磨對象物,可容易得到表面缺陷少之研磨面。
研磨粒的平均一次粒徑,較佳為5nm以上,又較佳為7nm以上,更佳為10nm以上。隨著研磨粒的平均一次粒徑增大,有利於提昇藉由研磨用組成物之研磨對象物之除去速度。尚,研磨粒的平均一次粒徑之值,例如可根據由BET法所測定之研磨粒的比表面積來計算。
研磨粒的平均一次粒徑,較佳為100nm以下,尤佳為90nm以下,更佳為80nm以下。隨著研磨粒的平均一次粒徑減少,藉由使用研磨用組成物來研磨研磨對象物,可容易得到表面缺陷少之研磨面。
研磨粒的平均二次粒徑,較佳為150nm以下,又較佳為120nm以下,更佳為100nm以下。研磨粒的平均二次粒徑之值,例如可藉由雷射光散射法來測定。
研磨粒之以平均一次粒徑之值除上平均二次粒徑之值所得之研磨粒的平均結合度(degree of association),較佳為1.2以上,又較佳為1.5以上。隨著研磨粒的平均結
合度增大,具有可提昇藉由研磨用組成物之研磨對象物之除去速度之優點。
研磨粒的平均結合度,較佳為4以下,又較佳為3以下,更佳為2以下。隨著研磨粒的平均結合度降低,藉由使用研磨用組成物來研磨研磨對象物,可容易得到表面缺陷少之研磨面。
研磨用組成物為包含選自於含磷化合物之至少1種以上的特定添加劑。用來研磨以往含有金屬之表面的典型研磨用組成物,係藉由該研磨用組成物中所包含的氧化劑來使研磨對象之金屬氧化,以形成金屬氧化物,進而再藉由以錯化劑來使金屬氧化物溶解,而進行研磨。相較於此係認為本發明之研磨用組成物為,該研磨用組成物中所包含的上述特定添加劑會與相變合金表面進行錯合化,而形成不溶性的脆性膜,藉由將該脆性膜以研磨粒進行機械性研磨,因而可得到高研磨速度。
作為添加劑之含磷化合物方面,當使用含磷有機化合物時,該含磷有機化合物係指為包含碳(C)-磷(P)鍵結之有機化合物,列舉例如膦、膦氧化物(phosphine oxide)、膦硫化物(phosphine sulfide)、二膦(diphosphane)等之3價磷之酸及鹵化物、鏻鹽、膦酸、次膦酸及此等之衍生物。就容易與相變合金表面錯合化並形成不溶性的脆性膜,其結果方面可得到所謂的高研磨速
度之觀點而言,較佳為次膦酸及膦酸,更具體而言,較佳為含有選自於2-胺基乙基膦酸、1-羥基亞乙基-1,1-二膦酸、胺基三(亞甲基膦酸)、乙二胺四(亞甲基膦酸)、二伸乙三胺五(亞甲基膦酸)、乙烷-1,1,-二膦酸、乙烷-1,1,2-三膦酸、乙烷-1-羥基-1,1-二膦酸、乙烷-1-羥基-1,1,2-三膦酸、乙烷-1,2-二羧基-1,2-二膦酸、甲烷羥基膦酸、2-膦醯基丁烷-1,2-二羧酸、1-膦醯基丁烷-2,3,4-三羧酸、α-甲基膦醯基琥珀酸、苯基膦酸、次膦酸所成之群之至少1種以上的化合物。上述有機磷化合物亦可為鹽。
又,上述有機磷化合物可單獨使用1種,亦可組合2種以上使用。
研磨用組成物中,含磷有機化合物之含有量之上限較佳為10質量%,又較佳為8質量%,更佳為5質量%。隨著含磷有機化合物之含有量減少,由於可降低製造成本,故宜。
研磨用組成物中,含磷有機化合物之含有量之下限較佳為0.001質量%,又較佳為0.01質量%,更佳為0.1質量%。隨著含磷有機化合物之含有量增加,由於研磨速度會變高,故宜。
作為添加劑之含磷化合物方面,當使用含磷無機化合物時,列舉例如磷酸、次磷酸、過氧單磷酸、過氧焦磷酸、多磷酸(焦磷酸、三磷酸、四磷酸)、偏磷酸、二醯胺磷酸、醯胺磷酸、六氟磷酸、六氯磷酸、苯基磷酸、磷灰石、磷鉬酸、磷鎢酸、二磷鉬酸、二磷鎢酸、超磷酸
(ultra phosphoric acid)、三溴化磷、五溴化磷、二溴氮
化磷、三氯化磷、五氯化磷、四氯化二磷、二氯氟化磷、二氯三氟化磷、二氯氮化磷、四氯三氧化磷、四氯磷酸、三氰化磷、三氟化磷、五氟化磷、四氟化二磷、三碘化磷、四碘化二磷、氮化磷、氧化磷(一氧化磷、二氧化磷、三氧化二磷、五氧化二磷、六氧化四磷、十氧化四磷)、溴化磷醯、氯化磷醯、氟化磷醯、氮化磷醯、二磷醯四醯胺、硫化磷(五硫化二磷、三硫化四磷、五硫化四磷、七硫化四磷)、溴化硫磷醯、氯化硫磷醯、氫化磷、參(異氰酸)磷、參(異氰酸)磷醯、參(異硫氰酸)磷、參(異硫氰酸)磷醯、硒化磷、三硒化二磷、三硒化四磷、五硒化二磷、氟化硫磷醯、碘化硫磷醯、磷醯胺、氮化硫磷醯、硫磷醯胺、磷醯化異硫氰酸、磷、磷化物(磷化鋅、磷化鋁、磷化釔、磷化銥、磷化鉀、磷化鎵、磷化鈣、磷化鋨、磷化鎘、磷化金、磷化銦、磷化鈾、磷化鉻、磷化矽、磷化銀、磷化鍺、磷化鈷、磷化鋯、磷化汞、磷化鈧、磷化錫、磷化鉈、磷化鎢、磷化鉭、磷化鈦、磷化鐵、磷化銅、磷化釷、磷化鈉、磷化鈮、磷化鎳、磷化錼、磷化鉑、磷化釩、磷化鉿、磷化鈀、磷化鋇、磷化鈽、磷化鈹、磷化硼、磷化鎂、磷化錳、磷化鉬、磷化鑭、磷化鋰、磷化釕、磷化錸、磷化銠等)。就容易與相變合金表面錯合化並形成不溶性的脆性膜,其結果方面可得到所謂的高研磨速度之觀點而言,較佳為含有由磷酸、次磷酸、過氧單磷酸、過氧焦磷酸、多磷酸(焦
磷酸、三磷酸、四磷酸)、偏磷酸、二醯胺磷酸、醯胺磷酸、六氟磷酸、六氯磷酸、苯基磷酸所成之群之至少1種以上的化合物,更佳為含有由磷酸及苯基磷酸所成之群之至少1種以上的化合物。上述含磷無機化合物可為鹽。
又,上述含磷無機化合物可單獨使用1種,亦可組合2種以上使用。
研磨用組成物中,含磷有機化合物之含有量之上限較佳為10質量%,又較佳為8質量%,更佳為5質量%。隨著含磷有機化合物之含有量減少,由於可降低製造成本,故宜。
研磨用組成物中,含磷有機化合物之含有量之下限較佳為0.001質量%,又較佳為0.01質量%,更佳為0.1質量%。隨著含磷有機化合物之含有量增加,由於研磨速度會變高,故宜。
研磨用組成物之pH之下限為7.0。當研磨用組成物之pH為7.0以上時,容易與相變合金表面錯合化並形成不溶性的脆性膜,其結果方面可得到所謂的高研磨速度。
又,當pH過高時,研磨用組成物中的研磨粒之分散性會提昇,其結果方面由於研磨後的研磨對象物之表面精度會提昇,故宜;研磨用組成物之pH之下限必須為7.0。
研磨用組成物之pH之上限未特別特限定,但較佳為12,又較佳為10。隨著pH之變低,研磨用組成物之操作
性會提昇。
為了將研磨用組成物之pH調整成所希望之值,因應所需而使用的pH調整劑可任意為酸或鹼,又,亦可為任意的無機或有機之化合物。
研磨用組成物中可進而含有氧化劑。氧化劑為具有將研磨對象物之表面氧化之作用,當研磨用組成物中添加有氧化劑時,藉由研磨用組成物之研磨速度具有提昇之效果。然而,當研磨對象物為具有相變合金,若使用用來研磨以往含有金屬之表面的典型研磨用組成物來進行研磨時,會引起過度研磨。此可考量為相變合金之特性與以往半導體中所使用的金屬(例如,Cu)之特性不同之故,當研磨對象物為具有相變合金時,氧化劑之含有量較佳為低者。
研磨用組成物中,氧化劑之含有量之上限,較佳為10質量%,又較佳為5質量%。隨著氧化劑之含有量減少,不易因氧化劑而產生相變合金之過剩氧化,可抑制過度研磨。
研磨用組成物中,氧化劑之含有量之下限,較佳為0.1質量%,又較佳為0.3質量%。隨著氧化劑之含有量增加,有助於研磨速度之提昇。
可使用的氧化劑,例如有過氧化物。作為過氧化物之具體例,列舉例如過氧化氫、過乙酸、過碳酸鹽、過氧化
尿素及過氯酸,以及過硫酸鈉、過硫酸鉀及過硫酸銨等之過硫酸鹽。之中就研磨速度之觀點而言,較佳為過硫酸鹽及過氧化氫;就在水溶液中的穩定性及環境負荷之觀點而言,特佳為過氧化氫。
研磨用組成物中可進而含有錯化劑。研磨用組成物中所包含的錯化劑,係具有將相變合金的表面化學性蝕刻之作用,而具有提昇藉由研磨用組成物之研磨速度之功用。
然而,當研磨對象物為具有相變合金,若使用用來研磨以往含有金屬之表面的典型研磨用組成物來進行研磨時,會引起過剩蝕刻,該結果會引起過度研磨。此可考量為相變合金之特性與以往半導體中所使用的金屬(例如,Cu)之特性不同之故,當研磨對象物為具有相變合金時,錯化劑之含有量較佳為低者。
研磨用組成物中,錯化劑之含有量之上限,較佳為10質量%,又較佳為1質量%。隨著錯化劑之含有量減少,不易因錯化劑而產生對於相變合金之過剩蝕刻。該結果可抑制過剩研磨。
研磨用組成物中,錯化劑之含有量之下限,較佳為0.01質量%,又較佳為0.1質量%。隨著錯化劑之含有量增加,對於相變合金之蝕刻效果會增加。該結果,有助於藉由研磨用組成物之研磨速度之提昇。
可使用的錯化劑,有例如無機酸、有機酸、及胺基
酸。作為無機酸之具體例,列舉例如硫酸、硝酸、硼酸、碳酸、次磷酸、亞磷酸及磷酸。作為有機酸的具體例,例如可列舉出甲酸、乙酸、丙酸、丁酸、戊酸、2-甲基丁酸、n-己酸、3,3-二甲基丁酸、2-乙基丁酸、4-甲基戊酸、n-庚酸、2-甲基己酸、n-辛酸、2-乙基庚酸、苯甲酸、乙醇酸、柳酸、甘油酸、草酸、丙二酸、琥珀酸、戊二酸、己二酸、庚二酸、馬來酸、鄰苯二甲酸、蘋果酸、酒石酸、檸檬酸及乳酸。亦可使用甲烷磺酸、乙烷磺酸及2-羥乙磺酸(isethionic acid)等之有機硫酸。此外,亦可使用無機酸或有機酸的鹼金屬鹽等之鹽,來取代無機酸或有機酸、或是與無機酸或有機酸組合使用。作為胺基酸的具體例,例如可列舉出甘胺酸、α-丙胺酸、β-丙胺酸、N-甲基甘胺酸、N,N-二甲基甘胺酸、2-胺基丁酸、正纈胺酸、纈胺酸、白胺酸、正白胺酸、異白胺酸、苯基丙胺酸、脯胺酸、肌胺酸、鳥胺酸、離胺酸、牛磺酸、絲胺酸、蘇胺酸、類絲胺酸、酪胺酸、蠶豆苷(vicine)、麥黃酮(tricine)、3,5-二碘-酪胺酸、β-(3,4-二羥苯基)-甘胺酸、甲狀腺素、4-羥基-脯胺酸、半胱胺酸、甲硫胺酸、乙硫胺酸、羊毛硫胺酸、胱硫醚、胱胺酸、氧化半胱胺酸(cysteic acid)、天門冬胺酸、麩胺酸、S-(羧甲基)-半胱胺酸、4-胺基丁酸、天門冬胺、麩胺、偶氮絲胺酸、精胺酸、刀豆氨酸、瓜氨酸、δ-羥基-離胺酸、肌酸、組胺酸、1-甲基-組胺酸、3-甲基-組胺酸、及色胺酸。之中作為錯化劑,就提昇研磨之觀點而言較佳為甘胺
酸、丙胺酸、蘋果酸、酒石酸、檸檬酸、乙醇酸、2-羥乙磺酸或是此等之鹽。
研磨用組成物中可進而含有金屬防蝕劑。當將金屬防蝕劑添加於研磨用組成物時,使用研磨用組成物進行研磨後之相變合金,具有不易產生碟狀凹陷(dishing)等表面缺陷之效果。此外,該金屬防蝕劑,當研磨用組成物中為包含氧化劑及/或錯化劑時,可緩和因氧化劑所造成的相變合金表面之氧化,且與金屬離子(其係因氧化劑所造成的相變合金表面之金屬之氧化所產生者)反應,而發揮生成不溶性的錯合物之功用。其結果可抑制因錯化劑所造成的對相變合金之蝕刻,並可抑制過度研磨。
可使用的金屬防蝕劑之種類未特別特限定,但較佳為雜環化合物。雜環化合物中的雜環之節數未特別特限定。
又,雜環化合物可為單環化合物,亦可為具有縮合環之多環化合物。
作為金屬防蝕劑之雜環化合物之具體例,列舉例如吡咯化合物、吡唑化合物、咪唑化合物、三唑化合物、四唑化合物、吡啶化合物、吡嗪化合物、噠嗪化合物、4-氮茚化合物、吲哚嗪化合物、吲哚化合物、異吲哚化合物、吲唑化合物、嘌呤化合物、喹嗪化合物、喹啉化合物、異喹啉化合物、萘啶化合物、酞嗪化合物、喹喔啉化合物、喹唑啉化合物、噌啉化合物、蝶啶化合物、噻唑化合物、異
噻唑化合物、噁唑化合物、異噁唑化合物及呋呫化合物等之含氮雜環化合物。作為吡唑化合物的具體例,例如可列舉出1H-吡唑、4-硝基-3-吡唑羧酸及3,5-吡唑羧酸。作為咪唑化合物的具體例,例如可列舉出咪唑、1-甲基咪唑、2-甲基咪唑、4-甲基咪唑、1,2-二甲基咪唑、2-乙基-4-甲基咪唑、2-異丙基咪唑、苯並咪唑、5,6-二甲基苯並咪唑、2-胺基苯並咪唑、2-氯苯並咪唑及2-甲基苯並咪唑。
作為三唑的具體例,例如可列舉出1,2,3-三唑、1,2,4-三唑、1-甲基-1,2,4-三唑、甲基-1H-1,2,4-三唑-3-羧酸酯、1,2,4-三唑-3-羧酸、1,2,4-三唑-3-羧酸甲酯、3-胺基-1H-1,2,4-三唑、3-胺基-5-苄基-4H-1,2,4-三唑、3-胺基-5-甲基-4H-1,2,4-三唑、3-硝基-1,2,4-三唑、3-溴-5-硝基-1,2,4-三唑、4-(1,2,4-三唑-1-基)酚、4-胺基-1,2,4-三唑、4-胺基-3,5-二丙基-4H-1,2,4-三唑、4-胺基-3,5-二甲基-4H-1,2,4-三唑、4-胺基-3,5-二庚基-4H-1,2,4-三唑、5-甲基-1,2,4-三唑-3,4-二胺、1-羥基苯並三唑、1-胺基苯並三唑、1-羧基苯並三唑、5-氯-1H-苯並三唑、5-硝基-1H-苯並三唑、5-羧基-1H-苯並三唑、5,6-二甲基-1H-苯並三唑、1-(1”,2’-二羧乙基)苯並三唑。作為四唑化合物的具體例,例如可列舉出1H-四唑、5-甲基四唑、5-胺基四唑、及5-苯基四唑。作為吲哚化合物的具體例,例如可列舉出1H-吲哚、1-甲基-1H-吲哚、2-甲基-1H-吲哚、3-甲基-1H-吲哚、4-甲基-1H-吲哚、5-甲基-1H-吲哚、6-甲基-1H-吲哚、及7-甲基-1H-吲哚。作為吲唑化合物的具體
例,例如可列舉出1H-吲唑及5-胺基-1H-吲唑。此等雜環化合物,由於對相變合金之化學或物理吸附力高,所以可將更堅固的保護膜形成於相變合金表面。因此,可抑制在使用研磨用組成物進行研磨後之相變合金的過剩蝕刻。其結果可抑制過剩研磨。
研磨用組成物中,金屬防蝕劑之含有量之上限,較佳為10質量%,又較佳為5質量%,更佳為1質量%。隨著金屬防蝕劑之含有量減少,藉由研磨用組成物之研磨速度具有提昇之效果。
研磨用組成物中,金屬防蝕劑之含有量之下限,較佳為0.001質量%,又較佳為0.01質量%,更佳為0.1質量%。隨著金屬防蝕劑之含有量增加,可抑制在使用研磨用組成物進行研磨後之相變合金的過剩蝕刻。其結果可抑制過剩研磨。
本發明之其他實施形態為提供一種研磨方法,其係使用本發明之研磨用組成物用來研磨具有相變合金之研磨對象物之表面。作為可在本研磨方法中使用之墊片(pads),可使用不織布、發泡聚胺基甲酸酯(PU)、多孔質氟樹脂等,並無特別限制。此外,可在研磨墊片上施以溝槽加工以使研磨用組成物容易停留在研磨墊片上。
研磨具有相變合金之研磨對象物的研磨墊片,該研磨墊片之硬度之下限,以蕭氏硬度D計較佳為50。當墊片的蕭氏硬度D愈高時,墊片的機械性作用愈大,可提升研磨速度。此外,本發明實施形態之研磨用組成物係具有,
即使為未含有研磨粒,亦可得到所謂的高研磨速度之優點。由如此般之觀點而言,蕭氏硬度D之又較佳的下限為60。
研磨具有相變合金之研磨對象物的研磨墊片,該研磨墊片之硬度之上限,以蕭氏硬度D計較佳為99。當墊片的蕭氏硬度D愈低時,愈不易使研磨對象物形成損傷。由如此般之觀點而言,蕭氏硬度D之更佳的上限為95。當墊片硬度未滿50時,墊片之機械性作用會變小,研磨速度會降低。尚,蕭氏硬度D,就定義上不會有100以上之值。墊片的蕭氏硬度D,可藉由蕭氏硬度D測定儀來測定。
蕭氏硬度D為50以上之研磨墊片,可由發泡體所形成,或是由布、不織布等之非發泡體所形成;作為研磨墊片之材質,可使用聚胺基甲酸酯、丙烯酸、聚酯、丙烯酸-酯共聚物、聚四氟乙烯、聚丙烯、聚乙烯、聚4-甲基戊烯、纖維素、纖維素酯、尼龍及醯胺等之聚醯胺、聚醯亞胺、聚醯亞胺醯胺、聚矽氧烷共聚物、環氧乙烷化合物、酚樹脂、聚苯乙烯、聚碳酸酯、環氧樹脂等之樹脂。
藉由本實施形態,可得到下列作用及效果。
用來研磨以往含有金屬之表面的典型研磨用組成物,係藉由該研磨用組成物中所包含的氧化劑來使研磨對象之金屬氧化,以形成金屬氧化物,進而再藉由以錯化劑來使金屬氧化物溶解,而進行研磨。相較於此係認為本實施形態之研磨用組成物為,該研磨用組成物中所包含的特定添
加劑會與相變合金表面進行錯合化,而形成不溶性的脆性膜,並以研磨粒機械性研磨該脆性膜。其結果可提昇研磨速度。
前述實施形態亦可變更如下。
.前述實施形態之研磨用組成物,因應所需可進而含有界面活性劑或水溶性高分子、防腐劑般之一般所公知的添加劑。
.前述實施形態之研磨用組成物,可為單液型或是以雙液型為首之多液型。
.前述實施形態之研磨用組成物,可藉由以水來稀釋研磨用組成物之原液而調製出。
接著說明本發明之實施例及比較例。
藉由將各成分以成為如表1中所記載之組成之方式予以混合,而調整出實施例1~6及比較例1~24之研磨用組成物。表1中的“添加劑”欄之“種類”欄中,實施例時為表示選自各研磨用組成物中所包含的含磷化合物之添加劑之種類;比較例時為表示選自含磷化合物之添加劑以外的添加劑之種類,或是表示各研磨用組成物中所包含的由錯化劑、防蝕劑(其係用來研磨以往含有金屬之表面的典型研磨用組成物中所含有者)所選定的添加劑之種類。又,“含有量(質量%)”欄中為表示各研磨用組成物中該添加劑之含有量。同欄當中以“-”表示者,為未含有
該添加劑之意。表1的“pH”欄中為表示各研磨用組成物中的pH。又,“研磨粒”欄中為表示各研磨用組成物中的研磨粒濃度。(研磨粒為使用具有約60nm之平均二次粒徑(平均一次粒徑30nm)的膠體矽石)。尚,雖然表1中未表示出來,但各研磨用組成物中為添加有如2.1質量%般的過氧化氫。又,pH為添加無機酸或無機鹼,以調整成指定之值。
使用實施例1~6及比較例1~24之各研磨用組成物,並以表2所示之條件來研磨含有GST合金(Ge、Sb及Te的質量%比為2:2:5)之無圖型晶圓(blanket wafer)。關於以表2所示條件進行一定時間研磨時之研磨速度,係依據直流四探針法所進行的薄片電阻(sheet resistance)的測定中,由所求取的研磨前後的無圖型晶圓之厚度差,除以研磨時間來算出研磨速度。該結果為表示於表1中“評估”欄之“研磨速度”欄。尚,評估基準為在使用相同的添加劑之研磨用組成物中,將相較於酸性pH之鹼pH之研磨速度為1.25倍以上,且研磨速度為100Å/min以上的研磨用組成物判斷為良好。又,雖然表1中未表示出來,但當研磨用組成物之pH較7.0為低時,研磨粒之分散安定為差;相較於此,當研磨用組成物之pH為7.0以上時,研磨粒之分散穩定性為良好。
如表1中所示般,相較於使用未符合本發明條件之比較例1~24之研磨用組成物,使用實施例1~6之研磨用組成物時,在研磨速度確認得到顯著優異之功效。
Claims (7)
- 一種研磨用組成物,其係使用於研磨具有相變合金之研磨對象物之用途之研磨用組成物,其特徵為包含研磨粒及添加劑,前述添加劑為選自於含磷化合物之至少1種以上,前述研磨用組成物之pH為7.0以上。
- 如請求項1之研磨用組成物,其中前述研磨粒為膠體矽石。
- 如請求項1之研磨用組成物,其中前述含磷化合物為選自於含磷有機化合物之至少1種以上。
- 如請求項1之研磨用組成物,其中前述含磷化合物為選自於含磷無機化合物之至少1種以上。
- 如請求項1~4中任一項之研磨用組成物,其中前述相變合金為GST。
- 一種研磨方法,其特徵係使用請求項1~4中任一項之研磨用組成物來研磨具有相變合金之研磨對象物之表面。
- 一種基板之製造方法,其特徵係具有使用請求項1~4中任一項之研磨用組成物來研磨具有相變合金之研磨對象物之表面之步驟。
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