JPWO2018025883A1 - ガラス基板、半導体装置および表示装置 - Google Patents
ガラス基板、半導体装置および表示装置 Download PDFInfo
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- JPWO2018025883A1 JPWO2018025883A1 JP2018531936A JP2018531936A JPWO2018025883A1 JP WO2018025883 A1 JPWO2018025883 A1 JP WO2018025883A1 JP 2018531936 A JP2018531936 A JP 2018531936A JP 2018531936 A JP2018531936 A JP 2018531936A JP WO2018025883 A1 JPWO2018025883 A1 JP WO2018025883A1
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Abstract
Description
ガラス基板G1とシリコン基板10は、直接貼り合わされてもよく、接合層20を間に挟んで貼りあわされてもよい。
接合層20は、200℃〜700℃の温度に耐えられるものであれば特に限定されない。接合層20は、例えば樹脂で形成されてもよく、無機絶縁層で形成されてもよく、有機絶縁層で形成されてもよい。接合層20は、単層でもよく、複数層でもよい。
また、シリコン基板10が単結晶シリコン基板の場合、シリコン基板10のガラス基板G1に貼り合わされる表面には、単結晶シリコン膜を有する薄膜トランジスタ(TFT; thin film transistor)が形成されており、ガラス基板G1との貼り合わせにより、この薄膜トランジスタがガラス基板G1上に転写される。尚、シリコン基板10が単結晶シリコン基板の場合、ガラス基板G1上には、単結晶シリコン膜を有する薄膜トランジスタが転写されると考えられる。しかしながら、シリコン基板10とガラス基板G1の貼り合わせ工程やその他の工程を経ることにより、薄膜トランジスタの単結晶シリコン膜が変性して単結晶シリコン膜でなくなる可能性もある。よって、ガラス基板上に形成される薄膜トランジスタは、多結晶をも含む概念である結晶性シリコン膜を有するものであってもよい。
ステップS3:ガラス基板の熱収縮に伴う薄膜トランジスタのパターンずれの発生(例えば、パターンの原図は熱処理前のガラス基板のサイズで設計しているのに対し、工程を流動しているガラス基板が熱処理により収縮が起きることがある。そのため、後工程で原図通りにパターニングを行うことで、パターンずれが生じてしまう。なお、後工程のパターニング工程には、露光工程や、蒸着、印刷工程などが含まれる。)。
ステップS4:ガラス基板の白濁化
ガラス基板の表面を研磨加工して100mm×20mmの試料を得る。該試料の表面に点状の圧痕を長辺方向に2箇所、間隔A(A=95mm)で打つ。
次に該試料を室温から600℃まで昇温速度100℃/時(=1.6℃/分)で加熱し、600℃で80分間保持した後、降温速度100℃/時で室温まで冷却する。そして、再度、圧痕間距離を測定し、その距離をBとする。このようにして得たA、Bから下記式を用いてコンパクションを算出する。なお、A、Bは光学顕微鏡を用いて測定する。
コンパクション[ppm]=(A−B)/A×106
SiO2 :50%〜75%、
Al2O3 :6%〜16%、
B2O3 :0%〜15%、
MgO :0%〜15%、
CaO :0%〜13%、
SrO :0%〜11%、
BaO :0%〜9.5%
10mm×10mm×0.3mm〜2.0mmの直方体に加工したガラスを、赤外線加熱式電気炉を用い、歪点+170℃にて5分間保持し、その後、ガラスを室温(25℃)まで冷却する。このとき、冷却速度を1℃/分から1000℃/分の範囲で振った複数のガラスサンプルを作成する。
得られたndを、前記冷却速度の対数に対してプロットすることにより、前記冷却速度に対するndの検量線を得る。
0.0177×(SiO2の含有量)−0.0173×(Al2O3の含有量)+0.0377×(B2O3の含有量)+0.0771×(MgOの含有量)+0.1543×(CaOの含有量)+0.1808×(SrOの含有量)+0.2082×(BaOの含有量)+0.0344×(log10qeq)が2.70〜3.20、
0.0181×(SiO2の含有量)+0.0004×(Al2O3の含有量)+0.0387×(B2O3の含有量)+0.0913×(MgOの含有量)+0.1621×(CaOの含有量)+0.1900×(SrOの含有量)+0.2180×(BaOの含有量)+0.0391×(log10qeq)が3.13〜3.63、
0.0177×(SiO2の含有量)+0.0195×(Al2O3の含有量)+0.0323×(B2O3の含有量)+0.1015×(MgOの含有量)+0.1686×(CaOの含有量)+0.1990×(SrOの含有量)+0.2179×(BaOの含有量)+0.0312×(log10qeq)が3.45〜3.95、および
0.0111×(SiO2の含有量)+0.0250×(Al2O3の含有量)+0.0078×(B2O3の含有量)+0.0144×(MgOの含有量)+0.0053×(CaOの含有量)+0.0052×(SrOの含有量)+0.0013×(BaOの含有量)−0.0041×(log10qeq)が1.10〜1.30を満たすことが好ましい。
本発明の一実施形態のガラス基板を製造する場合、ガラス原料を加熱して溶融ガラスを得る溶解工程、溶融ガラスから泡を除く清澄工程、溶融ガラスを板状にしてガラスリボンを得る成形工程、およびガラスリボンを室温状態まで徐冷する徐冷工程を経る。
SiO2 :50%〜75%、
Al2O3 :6%〜16%、
B2O3 :0%〜15%、
MgO :0%〜15%、
CaO :0%〜13%、
SrO :0%〜11%、
BaO :0%〜9.5%
0.0177×(SiO2の含有量)−0.0173×(Al2O3の含有量)+0.0377×(B2O3の含有量)+0.0771×(MgOの含有量)+0.1543×(CaOの含有量)+0.1808×(SrOの含有量)+0.2082×(BaOの含有量)+0.0344×log10Rが2.70〜3.20
0.0181×(SiO2の含有量)+0.0004×(Al2O3の含有量)+0.0387×(B2O3の含有量)+0.0913×(MgOの含有量)+0.1621×(CaOの含有量)+0.1900×(SrOの含有量)+0.2180×(BaOの含有量)+0.0391×log10Rが3.13〜3.63
0.0177×(SiO2の含有量)+0.0195×(Al2O3の含有量)+0.0323×(B2O3の含有量)+0.1015×(MgOの含有量)+0.1686×(CaOの含有量)+0.1990×(SrOの含有量)+0.2179×(BaOの含有量)+0.0312×log10Rが3.45〜3.95
0.0111×(SiO2の含有量)+0.0250×(Al2O3の含有量)+0.0078×(B2O3の含有量)+0.0144×(MgOの含有量)+0.0053×(CaOの含有量)+0.0052×(SrOの含有量)+0.0013×(BaOの含有量)−0.0041×log10Rが1.10〜1.30
条件(1):
0.0177×(SiO2の含有量)−0.0173×(Al2O3の含有量)+0.0377×(B2O3の含有量)+0.0771×(MgOの含有量)+0.1543×(CaOの含有量)+0.1808×(SrOの含有量)+0.2082×(BaOの含有量)+0.0344×log10Rが2.80〜3.10
0.0181×(SiO2の含有量)+0.0004×(Al2O3の含有量)+0.0387×(B2O3の含有量)+0.0913×(MgOの含有量)+0.1621×(CaOの含有量)+0.1900×(SrOの含有量)+0.2180×(BaOの含有量)+0.0391×log10Rが3.23〜3.53
0.0177×(SiO2の含有量)+0.0195×(Al2O3の含有量)+0.0323×(B2O3の含有量)+0.1015×(MgOの含有量)+0.1686×(CaOの含有量)+0.1990×(SrOの含有量)+0.2179×(BaOの含有量)+0.0312×log10Rが3.55〜3.85
条件(4)
0.0111×(SiO2の含有量)+0.0250×(Al2O3の含有量)+0.0078×(B2O3の含有量)+0.0144×(MgOの含有量)+0.0053×(CaOの含有量)+0.0052×(SrOの含有量)+0.0013×(BaOの含有量)−0.0041×log10Rが1.24〜1.27
表1に示すガラス組成(目標組成)となるように、珪砂等の各種のガラス原料を調合した。原料を白金坩堝に入れ、電気炉中にて1550℃〜1650℃の温度で3時間加熱して溶融し、溶融ガラスとした。溶融にあたっては、白金坩堝に白金スターラーを挿入して1時間攪拌し、ガラスの均質化を行った。溶融ガラスをカーボン板上に流し出し、板状に成形後、板状のガラスをTg+50℃程度の温度の電気炉に入れ、冷却速度R(℃/分)で電気炉を降温させ、ガラスが室温になるまで冷却した。
0.0177×(SiO2の含有量)−0.0173×(Al2O3の含有量)+0.0377×(B2O3の含有量)+0.0771×(MgOの含有量)+0.1543×(CaOの含有量)+0.1808×(SrOの含有量)+0.2082×(BaOの含有量)+0.0344×log10qeqが2.70〜3.20
0.0181×(SiO2の含有量)+0.0004×(Al2O3の含有量)+0.0387×(B2O3の含有量)+0.0913×(MgOの含有量)+0.1621×(CaOの含有量)+0.1900×(SrOの含有量)+0.2180×(BaOの含有量)+0.0391×log10qeqが3.13〜3.63
0.0177×(SiO2の含有量)+0.0195×(Al2O3の含有量)+0.0323×(B2O3の含有量)+0.1015×(MgOの含有量)+0.1686×(CaOの含有量)+0.1990×(SrOの含有量)+0.2179×(BaOの含有量)+0.0312×log10qeqが3.45〜3.95
0.0111×(SiO2の含有量)+0.0250×(Al2O3の含有量)+0.0078×(B2O3の含有量)+0.0144×(MgOの含有量)+0.0053×(CaOの含有量)+0.0052×(SrOの含有量)+0.0013×(BaOの含有量)−0.0041×log10qeqが1.10〜1.30
なお、表中のかっこ書きした値は、計算値である。
以下に各物性の測定方法を示す。
JIS R3102(1995年)に規定されている方法に従い、示差熱膨張計(TMA)を用いて測定した。α50/100は測定温度範囲が50℃〜100℃、α100/200は100℃〜200℃、およびα200/300は200℃〜300℃である。
表2に単結晶シリコンであるシリコン基板(信越化学工業製)の平均熱膨張係数を示す。シリコン基板のαSi50/100は2.94、αSi100/200は3.37ppm/℃、αSi200/300は3.69、αSi200/300/αSi50/100は1.25であった。シリコン基板の平均熱膨張係数は、典型的には表2に示す値である。
(コンパクション)
上述したように、試料の圧痕間距離の測定に基づき算出した。
(BHFヘイズ)
上述したように、50%フッ酸と40%フッ化アンモニウム水溶液の混合した液への浸漬後、スガ試験機社製ヘイズメーターを用いて測定した。
(HF重量減少率)
上述したように、25℃、5質量%のフッ酸水溶液中にガラスを40mm角に鏡面研磨加工したガラスを20分間浸漬し、浸漬前後に測定したガラスの重量から重量減少量を求めた。20分間での重量減少量を1分間当りに換算することによって、単位面積および単位時間当たりの減少量((mg/cm2)/分)を求めた。
厚さ0.5mm〜10mmのガラスについて、超音波パルス法により測定した。
(密度)
泡を含まない約20gのガラス塊を、アルキメデス法によって測定した。
(歪点)
JIS R3103−2(2001年)に規定されている方法に従い測定した。
(透過率)
厚さ0.5mmのガラス基板について、波長300nmの光の透過率(%)を可視紫外分光光度計を用いて測定した。
(T2)
回転粘度計を用いて粘度を測定し、102dPa・sとなるときの温度T2(℃)を測定した。
(T4)
回転粘度計を用いて粘度を測定し、104dPa・sとなるときの温度T4(℃)を測定した。
(失透温度)
失透温度は、粉砕されたガラス粒子を白金製皿に入れ、一定温度に制御された電気炉中で17時間熱処理を行い、熱処理後の光学顕微鏡観察によって、ガラスの表面または内部に結晶が析出する最高温度とガラスの表面または内部に結晶が析出しない最低温度との平均値とした。
(失透粘性)
ガラスの失透粘性(ガラスの失透温度におけるガラス粘度)は、回転粘度計を用いて、高温(1000℃〜1600℃)における溶融ガラスのガラス粘度を測定した結果から、フルチャーの式の係数を求め、該係数を用いたフルチャーの式により求めた。
(光弾性定数)
円板圧縮法(「円板圧縮法による化学強化用ガラスの光弾性定数の測定」、横田良助、窯業協会誌、87[10]、1979年、p.519−522)により測定した。
表1中の例1〜3は実施例であり、例4〜7は比較例である。例1〜3の無アルカリガラス基板は、コンパクションが100ppm以下であるため、パターンずれが起きにくい。また、|Δα50/100|、|Δα100/200|、および|Δα200/300|が0.16ppm/℃以下であるため、シリコン基板とガラス基板を貼り合わせる熱処理工程において、シリコン基板に発生する残留歪が小さくなりやすい。
20:接合層
30:薄膜トランジスタ
40:表示素子
50:積層基板
52:半導体装置
54:表示装置
Claims (20)
- コンパクションが0.1〜100ppmであるガラス基板であり、
50〜100℃における前記ガラス基板の平均熱膨張係数α50/100と単結晶シリコンの平均熱膨張係数との差の絶対値|Δα50/100|、100〜200℃における前記ガラス基板の平均熱膨張係数α100/200と単結晶シリコンの平均熱膨張係数との差の絶対値|Δα100/200|、および200〜300℃における前記ガラス基板の平均熱膨張係数α200/300と単結晶シリコンの平均熱膨張係数との差の絶対値|Δα200/300|が0.16ppm/℃以下であるガラス基板。 - 50℃〜100℃での平均熱膨張係数α50/100が2.70ppm/℃〜3.20ppm/℃である請求項1に記載のガラス基板。
- 200℃〜300℃での平均熱膨張係数α200/300が3.45ppm/℃〜3.95ppm/℃である請求項1に記載のガラス基板。
- 200℃〜300℃の平均熱膨張係数α200/300を50℃〜100℃の平均熱膨張係数α50/100で除した値α200/300/α50/100が、1.10〜1.30である請求項1に記載のガラス基板。
- BHFヘイズが40%以下である請求項1に記載のガラス基板。
- 200℃〜300℃での平均熱膨張係数α200/300が3.55ppm/℃〜3.85ppm/℃である請求項1に記載のガラス基板。
- 酸化物基準のモル百分率表示で、下記の組成である請求項1から6のいずれか1項に記載のガラス基板。
SiO2 :50%〜75%、
Al2O3 :6%〜16%、
B2O3 :0%〜15%、
MgO :0%〜15%、
CaO :0%〜13%、
SrO :0%〜11%、
BaO :0%〜9.5% - 酸化物基準のモル百分率表示で、CaO、SrO、およびBaOの合計含有量が5%以上、かつ(Al2O3の含有量)≧(MgOの含有量)であり、失透粘性が103.8dPa・s以上である請求項1から7のいずれか1項に記載のガラス基板。
- 100℃〜200℃での平均熱膨張係数α100/200が3.13ppm/℃〜3.63ppm/℃である、請求項1から8のいずれか1項に記載のガラス基板。
- 0.0177×(SiO2の含有量)−0.0173×(Al2O3の含有量)+0.0377×(B2O3の含有量)+0.0771×(MgOの含有量)+0.1543×(CaOの含有量)+0.1808×(SrOの含有量)+0.2082×(BaOの含有量)+0.0344×(log10qeq)が2.70〜3.20、
0.0181×(SiO2の含有量)+0.0004×(Al2O3の含有量)+0.0387×(B2O3の含有量)+0.0913×(MgOの含有量)+0.1621×(CaOの含有量)+0.1900×(SrOの含有量)+0.2180×(BaOの含有量)+0.0391×(log10qeq)が3.13〜3.63、
0.0177×(SiO2の含有量)+0.0195×(Al2O3の含有量)+0.0323×(B2O3の含有量)+0.1015×(MgOの含有量)+0.1686×(CaOの含有量)+0.1990×(SrOの含有量)+0.2179×(BaOの含有量)+0.0312×(log10qeq)が3.45〜3.95、および
0.0111×(SiO2の含有量)+0.0250×(Al2O3の含有量)+0.0078×(B2O3の含有量)+0.0144×(MgOの含有量)+0.0053×(CaOの含有量)+0.0052×(SrOの含有量)+0.0013×(BaOの含有量)−0.0041×(log10qeq)が1.10〜1.30を満たす請求項1から9のいずれか1項に記載のガラス基板。(ここで、SiO2の含有量、Al2O3の含有量、B2O3の含有量、MgOの含有量、CaOの含有量、SrO、およびBaOの含有量は、得られたガラスに含有される酸化物基準のモル百分率表示で表した含有量、qeqは等価冷却速度(単位:℃/分)である。) - 光弾性定数33nm/(MPa・cm)以下である、請求項1から10のいずれか1項に記載のガラス基板。
- 25℃、5質量%フッ酸水溶液に浸漬した際の、単位面積および単位時間当たりの減少量0.07(mg/cm2)/分以上、0.18(mg/cm2)/分以下である、請求項1〜11のいずれか1項に記載のガラス基板。
- コンパクションが0.1〜100ppmであり、
BHFヘイズが20%以下であり、
光弾性定数が33nm/(MPa・cm)以下であり、
25℃、5質量%フッ酸水溶液に浸漬した際の、単位面積および単位時間当たりの減少量0.07(mg/cm2)/分以上、0.18(mg/cm2)/分以下である、ガラス基板。 - 請求項1から13のいずれか1項に記載のガラス基板と、当該ガラス基板上に形成された結晶性シリコン膜を有する薄膜トランジスタとを含む半導体装置。
- 前記結晶性シリコン膜は単結晶シリコン膜である請求項14に記載の半導体装置。
- 請求項14または15に記載の半導体装置と、表示素子とを備える表示装置。
- 前記表示素子は、透明画像表示素子または反射型画像表示素子である、請求項16に記載の表示装置。
- 前記表示素子が、エレクトロルミネッセンスを用いた自発光型表示素子である、請求項16に記載の表示装置。
- ヘッドマウントディスプレイまたはプロジェクタである、請求項16または請求項17に記載の表示装置。
- 前記表示装置に用いられる表示素子の素子面における画素密度(画像分解能)が、1000ppi以上である請求項16から18のいずれか1項に記載の表示装置。
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CN109320070A (zh) * | 2018-10-16 | 2019-02-12 | 东旭科技集团有限公司 | 玻璃用组合物、铝硅酸盐玻璃及其制备方法和应用 |
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JP2012123405A (ja) * | 2001-11-13 | 2012-06-28 | Semiconductor Energy Lab Co Ltd | 半導体装置 |
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