JP2015023277A - 結晶性シリコンウェハーのテクスチャエッチング液組成物及びテクスチャエッチング方法 - Google Patents
結晶性シリコンウェハーのテクスチャエッチング液組成物及びテクスチャエッチング方法 Download PDFInfo
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- JP2015023277A JP2015023277A JP2014113698A JP2014113698A JP2015023277A JP 2015023277 A JP2015023277 A JP 2015023277A JP 2014113698 A JP2014113698 A JP 2014113698A JP 2014113698 A JP2014113698 A JP 2014113698A JP 2015023277 A JP2015023277 A JP 2015023277A
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Abstract
【解決手段】結晶性シリコンウェハーのテクスチャエッチング液組成物は、アルカリ性化合物と、重合度が1,000以下である水溶性グルカン系化合物とを含む。当該組成物は、炭素数1〜3のアルキルカルボキシ基又はその金属塩で置換されたグルコースが重合され、前記カルボキシ基又はその金属塩の総置換度が0.5〜1.2である水溶性グルカン系化合物を含む。これによって、結晶性シリコンウェハーの表面に微細ピラミッド構造を形成するにあたって、シリコン結晶方向に対するエッチング速度の差を制御することにより、アルカリ性化合物による過剰なエッチングを防止することで位置別テクスチャの品質偏差を最小限にして光効率を増加させることができる。
【選択図】図1
Description
多様な分子量を有するカルボキシメチルセルロースのナトリウム塩(C−1〜C−7)及びセルロース(C−8)を用意した。
グルカン系化合物は高分子であるため、分子量の測定を行うことが困難である。従って、粘度によって間接的に分子量を求めた。下記表1のような分子量、粘度、及び重合度を有する市販製品(Aldrich社製品)によって近似曲線を算出し、前記近似曲線に前記用意したC−1〜C−8の粘度を代入して分子量を測定した。近似曲線及びC−1〜C−8を代入した結果を図1に示した。グラフにおいて、赤色の直線(太い部分)は該当グルカン系化合物の粘度範囲を示す。
下記表2に記載の成分及び含有量に残量の水を添加して、結晶性シリコンウェハーのテクスチャ用エッチング液組成物を調製した。
単結晶シリコンウェハーを、実施例及び比較例の結晶性シリコンウェハーのテクスチャ用エッチング液組成物にそれぞれ浸漬させてエッチングした。この時、テクスチャ条件は温度80℃、時間20分であった。
テクスチャの均一性は、光学顕微鏡、SEMを用い、ピラミッドの大きさはSEMを用いて評価した。その結果を表2、図2(実施例3)、図3(実施例7)、及び図4(比較例1)で示した。
○:ウェハーの一部にピラミッドが形成されず(ピラミッド構造が形成されなかった程度:5%未満)
△:ウェハーの一部にピラミッドが形成されず(ピラミッド構造が形成されなかった程度:5〜50%)
×:ウェハーにピラミッドが形成されず(ピラミッドが形成されなかった程度:90%以上)
テクスチャ反射率は、紫外線を用いて400〜800nmの波長帯を有する光を照射した際の平均反射率を測定し、その結果を表3に示した。
Claims (18)
- アルカリ性化合物と、重合度が1,000以下である水溶性グルカン系化合物とを含み、
前記水溶性グルカン系化合物は、炭素数1〜3のアルキルカルボキシ基又はその金属塩で置換されたグルコースが重合され、前記カルボキシ基又はその金属塩の総置換度が0.5〜1.2であるように構成される、結晶性シリコンウェハーのテクスチャエッチング液組成物。 - 前記水溶性グルカン系化合物は、カルボキシメチルセルロース、カルボキシエチルセルロース、カルボキシプロピルセルロース、カルボキシブチルセルロース、及びこれらの金属塩からなる群から選択される少なくとも一種である、請求項1に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記置換されたセルロースの単位体は、セロビオースである、請求項2に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記水溶性グルカン系化合物は、前記テクスチャエッチング液組成物の全100重量%に対して、10−9〜0.5重量%含まれる、請求項1ないし3のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記アルカリ性化合物は、水酸化カリウム、水酸化ナトリウム、水酸化アンモニウム、テトラヒドロキシメチルアンモニウム、及びテトラヒドロキシエチルアンモニウムからなる群から選択される少なくとも一種である、請求項1ないし4のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 窒素原子を少なくとも一つ有する炭素数4〜10の環状化合物で置換された単量体が重合された高分子を更に含む、請求項1ないし5のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記単量体は、環構造に酸素及び硫黄原子のうち少なくとも一つを更に有する、請求項6に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記単量体は、N−ビニルピロリドン、N−アクリロイルモルホリン、N−ビニルスクシンイミド、N−アクリルオキシスクシンイミド、N−ビニルカプロラクタム、N−ビニルカルバゾール、及びN−アクリロイルピロリジンからなる群から選択される少なくとも1種である、請求項6または7に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記高分子は、重量平均分子量が1,000〜1,000,000である、請求項6ないし8のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記高分子は、沸点が100℃以上である、請求項6ないし9のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記高分子は、ハンセン溶解度パラメータが6〜15である、請求項6ないし10のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記高分子は、前記テクスチャエッチング液組成物の全重量に対して、10−12〜1重量%含まれる、請求項6ないし11のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 環状化合物を更に含む、請求項1ないし12のいずれかに記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記環状化合物は、沸点が100℃以上である、請求項13に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 前記環状化合物は、ハンセン溶解度パラメータが6〜15である、請求項13または14に記載の結晶性シリコンウェハーのテクスチャエッチング液組成物。
- 請求項1〜15のいずれか一項に記載のエッチング液組成物を用いた結晶性シリコンウェハーのテクスチャエッチング方法。
- 前記エッチング液組成物を50〜100℃の温度で30秒〜60分間噴霧させる、請求項16に記載のエッチング方法。
- 前記エッチング液組成物に前記ウェハーを50〜100℃の温度で30秒〜60分間沈積させる、請求項16に記載のエッチング方法。
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