JP5679068B2 - Igbtとその製造方法 - Google Patents
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Description
図1に示すIGBT10は、半導体基板12と、半導体基板12の上面及び下面に形成された電極、絶縁膜等により構成されている。
次に、第2実施形態のIGBTについて説明する。第2実施形態のIGBTは、図1、2に示す第1実施形態のIGBT10と略同様に各部が配置されている。但し、第2実施形態のIGBTは、不純物濃度分布が、第1実施形態のIGBT10と異なる。図30に示すように、第2実施形態のIGBTでは、トップボディ領域22内及びフローティング領域24内において、n型不純物濃度が略一定である。
本明細書または図面に説明した技術要素は、単独であるいは各種の組み合わせによって技術的有用性を発揮するものであり、出願時請求項記載の組み合わせに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。
Claims (12)
- 半導体基板を備えるIGBTであって、
半導体基板の上面に露出する範囲に形成されているn型のエミッタ領域と、
エミッタ領域の下側に形成されているp型のトップボディ領域と、
トップボディ領域の下側に形成されており、トップボディ領域によってエミッタ領域から分離されているn型のフローティング領域と、
フローティング領域の下側に形成されており、フローティング領域によってトップボディ領域から分離されているp型のボトムボディ領域と、
半導体基板の上面に形成されており、エミッタ領域、トップボディ領域、フローティング領域、及び、ボトムボディ領域を貫通しているトレンチと、
トレンチの内面を覆っているゲート絶縁膜と、
トレンチの内部に配置されているゲート電極、
を有しており、
エミッタ領域よりも下側に位置するトップボディ領域とフローティング領域内のp型不純物濃度分布を半導体基板の厚み方向に沿って見たときに、p型不純物濃度がエミッタ領域よりも下側に位置するトップボディ領域の上端から下側に向かうに従って減少し、フローティング領域内の第1所定深さで極小値となり、
フローティング領域内のp型不純物濃度分布を半導体基板の厚み方向に沿って見たときに、第1所定深さよりも下側においては、p型不純物濃度が、第1所定深さからフローティング領域の下端に至るまで下側に向かうに従って上昇する、または、第1所定深さから下側に向かうに従って上昇して第2所定深さで極大値となり、第2所定深さからフローティング領域の下端に至るまで下側に向かうに従って減少する、
IGBT。 - フローティング領域内のn型不純物濃度分布を半導体基板の厚み方向に沿って見たときに、フローティング領域内にn型不純物濃度の極大値が存在しない請求項1に記載のIGBT。
- フローティング領域が、エピタキシャル層により形成されている請求項1または2に記載のIGBT。
- フローティング領域とボトムボディ領域内のp型不純物濃度分布を半導体基板の厚み方向に沿って見たときに、p型不純物濃度が、第1所定深さからフローティング領域の下端に至るまで下側に向かうに従って上昇し、ボトムボディ領域内にp型不純物濃度の極大値が存在する請求項1〜3の何れか一項に記載のIGBT。
- 半導体基板の厚み方向に沿ったフローティング領域の幅が、ゲート絶縁膜から離れた位置よりもゲート絶縁膜に接している位置において広い請求項1〜4の何れか一項に記載のIGBT。
- ボトムボディ領域の下端が、ゲート絶縁膜から離れた位置よりもゲート絶縁膜に接している位置において下側に位置している請求項1〜5の何れか一項に記載のIGBT。
- IGBTの製造方法であって、
半導体基板の上面に露出する範囲にn型のエミッタ領域を形成する工程と、
半導体基板の上面にエミッタ領域の深さ範囲内で停止するようにp型不純物を注入し、注入したp型不純物を拡散させることによって、エミッタ領域の深さ範囲の下側にp型のトップボディ領域を形成する工程と、
半導体基板の上面にエミッタ領域の深さ範囲内で停止するようにn型不純物を注入し、注入したn型不純物を拡散させることによって、トップボディ領域の深さ範囲の下側にn型のフローティング領域を形成する工程と、
半導体基板の上面にトレンチを形成し、トレンチの内面を覆うゲート絶縁膜、及び、トレンチ内に配置されたゲート電極を形成する工程と、
トレンチ、ゲート絶縁膜、及び、ゲート電極を形成した後に、半導体基板の上面にフローティング領域の深さ範囲よりも下側の深さで停止するようにp型不純物を注入して、フローティング領域の深さ範囲の下側にp型のボトムボディ領域を形成する工程、
を有しており、
上記各工程の実施後に、トレンチが、エミッタ領域、トップボディ領域、フローティング領域、及び、ボトムボディ領域を貫通するように配置される、
製造方法。 - トレンチ、ゲート絶縁膜、及び、ゲート電極を形成する工程よりも前に、トップボディ領域を形成する工程及びフローティング領域を形成する工程を実施する請求項7に記載の製造方法。
- ボトムボディ領域を形成する工程では、ゲート電極の上面が半導体基板の上面よりも下側に存在している状態で、半導体基板にp型不純物を注入する請求項7または8に記載の製造方法。
- IGBTの製造方法であって、
基礎基板の上面に、n型半導体からなるエピタキシャル層を成長させる工程と、
エピタキシャル層の上面に露出する範囲にn型のエミッタ領域を形成する工程と、
エピタキシャル層の上面にエミッタ領域の深さ範囲内で停止するようにp型不純物を注入し、注入したp型不純物を拡散させることによって、エミッタ領域の深さ範囲の下側にp型のトップボディ領域を形成する工程と、
エピタキシャル層の上面にトレンチを形成し、トレンチの内面を覆うゲート絶縁膜、及び、トレンチ内に配置されたゲート電極を形成する工程と、
トレンチ、ゲート絶縁膜、及び、ゲート電極を形成した後に、エピタキシャル層の上面に基礎基板内で停止するようにp型不純物を注入して、基礎基板内にp型のボトムボディ領域を形成する工程、
を有しており、
上記各工程の実施後に、トップボディ領域とボトムボディ領域の間にn型のエピタキシャル層が残存してフローティング領域を構成し、トレンチが、エミッタ領域、トップボディ領域、フローティング領域、及び、ボトムボディ領域を貫通するように配置される、
製造方法。 - トレンチ、ゲート絶縁膜、及び、ゲート電極を形成する工程よりも前に、トップボディ領域を形成する工程を実施する請求項10に記載の製造方法。
- ボトムボディ領域を形成する工程では、ゲート電極の上面が半導体基板の上面よりも下側に存在している状態で、半導体基板にp型不純物を注入する請求項10または11に記載の製造方法。
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