JP2011135051A - Soi基板の作製方法 - Google Patents
Soi基板の作製方法 Download PDFInfo
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- JP2011135051A JP2011135051A JP2010252569A JP2010252569A JP2011135051A JP 2011135051 A JP2011135051 A JP 2011135051A JP 2010252569 A JP2010252569 A JP 2010252569A JP 2010252569 A JP2010252569 A JP 2010252569A JP 2011135051 A JP2011135051 A JP 2011135051A
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- semiconductor layer
- single crystal
- crystal semiconductor
- substrate
- layer
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
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Abstract
【解決手段】絶縁層を介して基板に設けられた第1単結晶半導体層上に、非晶質半導体層を形成する。非晶質半導体層は、成膜温度100℃以上275℃以下、シラン系ガスを希釈しないで用いるCVD法により形成する。熱処理を行って、非晶質半導体層を固相エピタキシャル成長させて、単結晶半導体層の膜厚の厚いSOI基板を作製する。
【選択図】図8
Description
図7に本実施の形態の作製工程を示す。はじめに、支持基板100を用意する(図7(A)参照)。支持基板100には、液晶表示装置などに使用されている透光性を有するガラス基板を用いることができる。ガラス基板としては、歪み点が580℃以上680℃以下(好ましくは、600℃以上700℃以下)であるものを用いると良い。また、ガラス基板は無アルカリガラス基板であることが好ましい。無アルカリガラス基板には、例えば、アルミノシリケートガラス、アルミノホウケイ酸ガラス、バリウムホウケイ酸ガラスなどのガラス材料が用いられている。
・加速電圧 10kV以上100kV以下(好ましくは30kV以上80kV以下)
・ドーズ量 1×1016/cm2以上4×1016/cm2以下
・ビーム電流密度 2μA/cm2以上(好ましくは5μA/cm2以上、より好ましくは10μA/cm2以上)
実施の形態1の方法を用いて固相エピタキシャル成長させたところ、図8(A)の第1の非晶質半導体層122Aだけでなく、その下層の第1の単結晶半導体層120も結晶性が改善していることが分かった。そこで、本実施形態では、エピタキシャル成長により結晶性が改善した単結晶半導体層を積極的に用いる。つまり、固相エピタキシャル成長させた後、エッチングによりエピタキシャル成長させた以上のエッチバック処理を行って、薄膜化する形態について説明する。なお、前述の図面と同一部分には同一符号を付し、同一部分の説明は省略する。
本実施の形態では、図13および図14を参照して、上記実施の形態で作製したSOI基板を用いて、nチャネル型薄膜トランジスタ、およびpチャネル型薄膜トランジスタを作製する方法を説明する。複数の薄膜トランジスタ(TFT)を組み合わせることで、各種の半導体装置を形成することができる。なお、前述の図面と同一部分には同一符号を付し、同一部分の説明は省略する。
本実施の形態では、上記実施の形態1または2の方法で作製したSOI基板を用いて、光電変換装置を作製する方法を図16〜図20を参照して説明する。なお、前述の図面と同一部分には同一符号を付し、同一部分の説明は省略する。
本実施の形態では、実施の形態1または2の方法で作製したSOI基板を用いて、光電変換素子を備える半導体装置およびその作製方法について説明する。なお、前述の図面と同一部分には同一符号を付し、同一部分の説明は省略する。
本実施の形態では、先の実施の形態1に示すSOI基板を用いた半導体装置の例について、図23および図24を参照して説明する。本実施の形態で示す半導体装置には膜厚の厚い単結晶半導体層を有するSOI基板が適しているため、実施の形態1の方法で作製したSOI基板を用いるのが好ましい。しかし、実施の形態2の方法で作製したSOI基板を用いても良い。なお、前述の図面と同一部分には同一符号を付し、同一部分の説明は省略する。
・成膜法:プラズマCVD
・原料ガス:シラン100sccm
・電力(周波数):50W(27MHz)
・圧力:35Pa
・電極間隔:25mm
・成膜温度:200℃
・膜厚:100nm
・原料ガス:アルゴン300sccm
・電力:350W
・時間:60秒
106 電極
108 不純物半導体層
109 ユニットセル
110 単結晶半導体基板
112 絶縁層
114 損傷領域
115 不純物半導体層
116 絶縁層
118 電極
120 単結晶半導体層
122A 第1の非晶質半導体層
124A 第2の単結晶半導体層
123 第3の単結晶半導体層
120A 第4の単結晶半導体層
130 単結晶半導体基板
140 イオンビーム
150 マスク
500 SOI基板
152 半導体層
154 絶縁層
156 マスク
158 半導体領域
160 補助電極
162 半導体領域
164 半導体領域
166 絶縁層
168 コンタクトホール
170 コンタクトホール
172 電極
174 電極
180 光電変換素子
200 領域
202 領域
204 領域
206 領域
210 電極
212 ゲート絶縁層
214 電極
216 電極
251 半導体膜
252 半導体膜
254 絶縁膜
255 ゲート電極
256 ゲート電極
257 低濃度不純物領域
258 チャネル形成領域
259 高濃度不純物領域
260 チャネル形成領域
261 サイドウォール絶縁膜
262 サイドウォール絶縁膜
265 レジスト
267 高濃度不純物領域
268 絶縁膜
269 層間絶縁膜
270 配線
300 マスク
Claims (12)
- 絶縁層を介して基板上に設けられた第1の単結晶半導体層を用意し、
成膜温度100℃以上275℃以下で、且つシラン系ガスを希釈しないで用いた雰囲気下でCVD法により、前記第1の単結晶半導体層上に非晶質半導体層を形成し、
熱処理を行い、前記非晶質半導体層を固相エピタキシャル成長させて、前記第1の単結晶半導体層上に第2の単結晶半導体層を形成することを特徴とするSOI基板の作製方法。 - 絶縁層を介して基板上に設けられた第1の単結晶半導体層を用意し、
成膜温度100℃以上275℃以下で、且つシラン系ガスのみを用いた雰囲気下でCVD法により、前記第1の単結晶半導体層上に非晶質半導体層を形成し、
熱処理を行い、前記非晶質半導体層を固相エピタキシャル成長させて、前記第1の単結晶半導体層上に第2の単結晶半導体層を形成することを特徴とするSOI基板の作製方法。 - 絶縁層を介して基板上に設けられた第1の単結晶半導体層を用意し、
成膜温度100℃以上275℃以下で、且つシラン系ガスを希釈しないで用いた雰囲気下でCVD法により、前記第1の単結晶半導体層上に非晶質半導体層を形成し、
熱処理を行い、前記非晶質半導体層を固相エピタキシャル成長させることにより、前記第1の単結晶半導体層及び前記非晶質半導体層から第2の単結晶半導体層を形成することを特徴とするSOI基板の作製方法。 - 絶縁層を介して基板上に設けられた第1の単結晶半導体層を用意し、
成膜温度100℃以上275℃以下で、且つシラン系ガスのみを用いた雰囲気下でCVD法により、前記第1の単結晶半導体層上に非晶質半導体層を形成し、
熱処理を行い、前記非晶質半導体層を固相エピタキシャル成長させることにより、前記第1の単結晶半導体層及び前記非晶質半導体層から第2の単結晶半導体層を形成することを特徴とするSOI基板の作製方法。 - 請求項1又は3において、前記第2の単結晶半導体層を除去することを特徴とするSOI基板の作製方法。
- 請求項2又は4において、前記第2の単結晶半導体層のうち、固相エピタキシャル成長した部分を除去することを特徴とするSOI基板の作製方法。
- 請求項1又は2において、前記第1の単結晶半導体層は、前記熱処理により結晶性が向上することを特徴とするSOI基板の作製方法。
- 請求項3又は4において、前記第2の単結晶半導体層は前記第1の単結晶半導体層よりも結晶性が向上していることを特徴とするSOI基板の作製方法。
- 請求項1乃至8のいずれか一項において、前記熱処理の前に、前記非晶質半導体層を希ガスでプラズマ処理することにより平坦化することを特徴とするSOI基板の作製方法。
- 請求項1乃至9のいずれか一項において、前記熱処理は、処理温度550℃以上で行うことを特徴とするSOI基板の作製方法。
- 請求項1乃至10のいずれか一において、単結晶半導体基板にイオンを照射して前記単結晶半導体基板に損傷領域を形成し、
前記絶縁層を介して前記単結晶半導体基板と前記基板とを貼り合わせ、
前記損傷領域において前記単結晶半導体基板を分離して、前記基板上に前記第1の単結晶半導体層を形成することにより、
前記絶縁層を介して前記基板上に設けられた前記第1の単結晶半導体層を用意することを特徴とするSOI基板の作製方法。 - 請求項1乃至11のいずれか一において、
前記基板はガラス基板またはプラスチック基板であることを特徴とするSOI基板の作製方法。
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