JP5439729B2 - 窒化珪素基板及びその製造方法並びにそれを使用した窒化珪素回路基板及び半導体モジュール - Google Patents
窒化珪素基板及びその製造方法並びにそれを使用した窒化珪素回路基板及び半導体モジュール Download PDFInfo
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Description
fa=(P−P0)/(1−P0) ・・・(1)
この式(1)において、Pは以下の式(2)で表され、窒化珪素基板における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度Iの合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度Iの合計との比を示す。また、P0は以下の式(3)で表され、窒化珪素粉末における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度I’ の合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度I’の合計との比を示す。
P=(I(110)+I(200)+I(210)+I(310)+I(320))/(I(110)+I(200)+I(101)+I(210)+I(201)+I(310)+I(320)+I(002))
・・・(2)
P0=(I’(110)+I’(200)+I’(210)+I’(310)+I’(320))/(I’(110)+I’(200)+I’(101)+I’(210)+I’(201)+I’(310)+I’(320)+I’(002))
・・・(3)
fa=(P−P0)/(1−P0) ・・・(1)
この式(1)において、Pは以下の式(2)で表され、窒化珪素基板における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度Iの合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度Iの合計との比を示す。また、P0は以下の式(3)で表され、窒化珪素粉末における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度I’ の合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度I’の合計との比を示す。
P=(I(110)+I(200)+I(210)+I(310)+I(320))/(I(110)+I(200)+I(101)+I(210)+I(201)+I(310)+I(320)+I(002))
・・・(2)
P0=(I’(110)+I’(200)+I’(210)+I’(310)+I’(320))/(I’(110)+I’(200)+I’(101)+I’(210)+I’(201)+I’(310)+I’(320)+I’(002))
・・・(3)
請求項7記載の発明は、請求項6記載の窒化珪素基板の製造方法において、前記熱処理の後に、窒化珪素基板の表面に砥粒を吹きつけて窒化珪素基板表面に存在する柱状粒子を削ることを特徴とする。
fa=(P−P0)/(1−P0) ・・・(1)
この式(1)において、Pは以下の式(2)で表され、窒化珪素基板における窒化珪素粒子の(110)面、(200)面、(210)面、(310)面及び(320)面のそれぞれのX線回折線強度の割合を意味する。また、P0は以下の式(3)で表され、窒化珪素粉末における窒化珪素粒子の(110)面、(200)面、(210)面、(310)面及び(320)面のそれぞれのX線回折線強度の割合を意味する。
P=(I(110)+I(200)+I(210)+I(310)+I(320))/(I(110)+I(200)+I(101)+I(210)+I(201)+I(310)+I(320)+I(002)) ・・・(2)
P0=(I’(110)+I’(200)+I’(210)+I’(310)+I’(320))/(I’(110)+I’(200)+I’(101)+I’(210)+I’(201)+I’(310)+I’(320)+I’(002)) ・・・(3)
Claims (7)
- 窒化珪素を含有し、前記窒化珪素粒子の所定格子面のそれぞれのX線回折線強度の割合から下記式(1)により定まる、厚さ方向に垂直な面内における配向割合を示す配向度faが、表面においては0.33以下であり、表面から基板厚さの20%以上内側まで研削して得られた面においては0.16〜0.33であるとともに、前記表面における配向度faが前記表面から基板厚さの20%以上内側まで研削して得られた面における配向度faより大きく、反りが2.0μm/mm以下であることを特徴とする窒化珪素基板。
fa=(P−P0)/(1−P0) ・・・(1)
この式(1)において、Pは以下の式(2)で表され、窒化珪素基板における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度Iの合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度Iの合計との比を示す。また、P0は以下の式(3)で表され、窒化珪素粉末における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度I’ の合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度I’の合計との比を示す。
P=(I(110)+I(200)+I(210)+I(310)+I(320))/(I(110)+I(200)+I(101)+I(210)+I(201)+I(310)+I(320)+I(002))
・・・(2)
P0=(I’(110)+I’(200)+I’(210)+I’(310)+I’(320))/(I’(110)+I’(200)+I’(101)+I’(210)+I’(201)+I’(310)+I’(320)+I’(002))
・・・(3) - 請求項1記載の窒化珪素基板において、前記配向度faが、表面においては0.28〜0.33であり、表面から基板厚さの20%以上内側まで研削して得られた面においては0.18〜0.29であることを特徴とする窒化珪素基板。
- 請求項2記載の窒化珪素基板において、面粗さが0.44μm以下であることを特徴とする窒化珪素基板。
- 請求項3記載の窒化珪素基板において、Mg(マグネシウム)を酸化マグネシウム換算で3〜4wt%、Y(イットリウム)を酸化イットリウム換算で2〜5wt%含有し、前記表面から基板厚さの20%以上内側まで研削して得られた面における配向度faが0.18〜0.22であることを特徴とする窒化珪素基板。
- 請求項4記載の窒化珪素基板において、厚みが0.1〜1.0mmであることを特徴とする窒化珪素基板。
- 窒化珪素原料粉に、酸化マグネシウムを3〜4重量%、酸化イットリウムを2〜5重量%の割合で配合し、
厚みが0.1〜1.0mmのシート成形体とし、
前記シート成形体を焼結して窒化珪素基板とし、
前記窒化珪素基板を複数枚重ねた状態で0.5〜6.0kPaの荷重を印加しながら1550〜1700℃で熱処理して、窒化珪素粒子の所定格子面のそれぞれのX線回折線強度の割合から下記式(1)により定まる、厚さ方向に垂直な面内における配向割合を示す配向度faを、表面においては0.33以下とし、表面から基板厚さの20%以上内側まで研削して得られた面においては0.16〜0.33とするとともに、前記表面における配向度faが前記表面から基板厚さの20%以上内側まで研削して得られた面における配向度faより大きく、反りが2.0μm/mm以下とすることを特徴とする窒化珪素基板の製造方法。
fa=(P−P0)/(1−P0) ・・・(1)
この式(1)において、Pは以下の式(2)で表され、窒化珪素基板における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度Iの合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度Iの合計との比を示す。また、P0は以下の式(3)で表され、窒化珪素粉末における窒化珪素粒子について(110)面、(200)面、(210)面、(310)面及び(320)面のX線回折線強度I’の合計と、(110)面、(200)面、(101)面、(210)面、(201)面、(310)面、(320)面及び(002)面のX線回折線強度I’の合計との比を示す。
P=(I(110)+I(200)+I(210)+I(310)+I(320))/(I(110)+I(200)+I(101)+I(210)+I(201)+I(310)+I(320)+I(002))
・・・(2)
P0=(I’(110)+I’(200)+I’(210)+I’(310)+I’(320))/(I’(110)+I’(200)+I’(101)+I’(210)+I’(201)+I’(310)+I’(320)+I’(002))
・・・(3) - 請求項6記載の窒化珪素基板の製造方法において、前記熱処理の後に、窒化珪素基板の表面に砥粒を吹きつけて窒化珪素基板表面に存在する柱状粒子を削ることを特徴とする窒化珪素基板の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008059178A JP5439729B2 (ja) | 2008-03-10 | 2008-03-10 | 窒化珪素基板及びその製造方法並びにそれを使用した窒化珪素回路基板及び半導体モジュール |
US12/379,868 US7948075B2 (en) | 2008-03-10 | 2009-03-03 | Silicon nitride substrate, method of manufacturing the same, and silicon nitride circuit board and semiconductor module using the same |
KR1020090018856A KR101569421B1 (ko) | 2008-03-10 | 2009-03-05 | 질화규소 기판 및 그 제조 방법, 그리고 그것을 사용한 질화규소 회로기판 및 반도체 모듈 |
EP09154697.8A EP2100865B1 (en) | 2008-03-10 | 2009-03-10 | Silicon nitride substrate, method of manufacturing the same, and silicon nitride circuit board and semiconductor module using the same |
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