JP2018160585A - 加熱方法、成膜方法、半導体装置の製造方法、および成膜装置 - Google Patents
加熱方法、成膜方法、半導体装置の製造方法、および成膜装置 Download PDFInfo
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- JP2018160585A JP2018160585A JP2017057511A JP2017057511A JP2018160585A JP 2018160585 A JP2018160585 A JP 2018160585A JP 2017057511 A JP2017057511 A JP 2017057511A JP 2017057511 A JP2017057511 A JP 2017057511A JP 2018160585 A JP2018160585 A JP 2018160585A
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Classifications
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- 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
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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Abstract
Description
まず、第1の実施形態として、本発明の加熱方法の基本例について説明する。
図1は、第1の実施形態の加熱方法を示すフローチャートである。
本例では、最初に、基板として表面にGe膜またはSiGe膜が形成されたシリコンウエハ等の半導体ウエハ(以下、単にウエハと記す。)を少なくとも一時大気雰囲気に保持した後、処理容器内に搬入する(ステップ1)。
図2は、SiN膜の上に膜厚約45nmのGe膜を形成したサンプルについて、N2ガス雰囲気下(N2ガス流量:1000sccm)で加熱温度を450℃、500℃、550℃、600℃で加熱処理した際の平面および断面の走査型電子顕微鏡(SEM)写真を示す図である。圧力は0.5Torr、保持時間は10secとした。
GeH4+O2 ⇔ GeO2↑+2H2 ・・・(1)
2GeH4+N2 ⇔ 2GeN↑+4H2 ・・・(2)
次に、第2の実施形態として、本発明の加熱方法をGe膜またはSiGe膜が形成されたウエハWにHigh−k膜を成膜する場合に適用した例について説明する。
まず、High−k膜を成膜する成膜装置の一例について説明する。
図6はそのような成膜装置を示す縦断面図、図7は図6に示す成膜装置の水平断面図である。
次に、上記成膜装置を用いた、成膜方法の一例について説明する。
本例では、例えばチャネル部として表面にGe膜またはSiGe膜が形成されたウエハWについて、ゲート絶縁膜としてHigh−k膜を成膜する。
本実施形態では、本発明の加熱方法を適用した半導体装置の製造方法について示す。
図9は第3の実施形態に係る半導体装置の製造方法の一例を示すフローチャート、図10はその工程断面図である。
以上、本発明の実施の形態について説明したが、この発明は、上記の実施形態に限定されることはなく、その趣旨を逸脱しない範囲で種々変形可能である。
5;ウエハボート
14;成膜原料ガス供給機構
15;酸化ガス供給機構
16;H2ガス供給機構
26;不活性ガス供給機構
41;排気装置
42;加熱装置
100;成膜装置
101,112;Ge膜またはSiGe膜
102,113;High−k膜
110;シリコン基板
111;SiO2膜
114;導電膜
121;チャネル部
122;ゲート絶縁膜
123;ゲート電極
124;ソース
125;ドレイン
201;SiN膜
202,204;自然酸化膜
203;Ge膜
205;孔
W;半導体ウエハ(基板)
Claims (13)
- 表面にゲルマニウム膜またはシリコンゲルマニウム膜が形成された基板を加熱する加熱方法であって、
少なくとも一時大気雰囲気に保持した前記基板を、処理容器内に搬入する工程と、
前記処理容器内を水素ガス含有雰囲気とした状態で前記基板を加熱する工程と
を有することを特徴とする加熱方法。 - 前記基板の加熱温度は450℃を超える温度であることを特徴とする請求項1に記載の加熱方法。
- 前記加熱する工程は、前記ゲルマニウム膜またはシリコンゲルマニウム膜の上に高誘電率膜を成膜する際の成膜温度までの加熱を行うことを特徴とする請求項2に記載の加熱方法。
- 前記水素ガス含有雰囲気は、水素ガスのみの雰囲気、または水素ガスと不活性ガスとを含む雰囲気であることを特徴とする請求項1から請求項3のいずれか1項に記載の加熱方法。
- 表面にゲルマニウム膜またはシリコンゲルマニウム膜が形成された基板に高誘電率膜を成膜する成膜方法であって、
少なくとも一時大気雰囲気に保持した前記基板を、成膜装置の処理容器内に搬入する工程と、
前記処理容器内を水素ガス含有雰囲気とした状態で少なくとも成膜温度に達するまで前記基板を加熱する工程と、
前記基板が前記成膜温度に達した後、前記高誘電率膜を成膜するための成膜原料ガスと、酸化ガスとを供給して、前記ゲルマニウム膜またはシリコンゲルマニウム膜の表面に高誘電率膜を成膜する工程と
を有することを特徴とする成膜方法。 - 前記成膜温度は、450℃を超える温度であることを特徴とする請求項5に記載の成膜方法。
- 前記成膜温度は、500〜600℃であることを特徴とする請求項6に記載の成膜方法。
- 前記水素ガス含有雰囲気は、水素ガスのみの雰囲気、または水素ガスと不活性ガスとを含む雰囲気を含むことを特徴とする請求項5から請求項7のいずれか1項に記載の成膜方法。
- 表面にゲルマニウム膜またはシリコンゲルマニウム膜が形成された基板に高誘電率膜を成膜する成膜装置であって、
前記ゲルマニウム膜またはシリコンゲルマニウム膜が形成された基板を収容する処理容器と、
前記処理容器内に高誘電率膜を成膜するための所定のガスを供給するガス供給部と、
前記処理容器内を加熱する加熱機構と、
前記処理容器内を排気して減圧状態とする排気機構と、
前記ガス供給部、前記加熱機構、および前記排気機構を制御する制御部と
を具備し、
前記制御部は、
前記排気機構により前記処理容器内を所定の減圧状態に制御し、前記加熱機構により前記処理容器内を所定温度に制御し、
少なくとも前記基板の温度が前記高誘電率膜の成膜温度まで達する期間、前記処理容器内が所定の水素ガス含有雰囲気になるようにガス供給部からのガス供給を制御することを特徴とする成膜装置。 - 前記制御部は、前記成膜温度が450℃を超える温度になるように前記加熱機構を制御することを特徴とする請求項9に記載の成膜装置。
- 前記制御部は、前記成膜温度が500〜600℃になるように前記加熱機構を制御することを特徴とする請求項10に記載の成膜装置。
- 前記水素ガス含有雰囲気は、水素ガスのみの雰囲気、または水素ガスと不活性ガスとを含む雰囲気を含むことを特徴とする請求項9から請求項11のいずれか1項に記載の成膜装置。
- 半導体基板の上に絶縁膜を介してゲルマニウム膜またはシリコンゲルマニウム膜を成膜する工程と、
前記ゲルマニウム膜またはシリコンゲルマニウム膜の上に高誘電率膜を成膜する工程と、
前記高誘電率膜の上に導電膜を成膜する工程と、
前記導電膜および前記高誘電率膜のエッチング、および前記ゲルマニウム膜またはシリコンゲルマニウム膜に対するイオン注入を行って、ゲルマニウム膜またはシリコンゲルマニウム膜からなるチャネル部ならびにソース電極およびドレイン電極、前記高誘電率膜からなるゲート絶縁膜、前記導電膜からなるゲート電極を形成する工程と
を有し、
前記ゲルマニウム膜またはシリコンゲルマニウム膜を成膜した後、少なくとも一時大気雰囲気に保持した前記半導体基板を、前記高誘電率膜を成膜する成膜装置の処理容器内に搬入し、前記処理容器内を水素ガス含有雰囲気とした状態で少なくとも成膜温度に達するまで前記半導体基板を加熱することを特徴とする半導体装置の製造方法。
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