JP2019083317A - フィールドゾーンを含む終端構造を有する半導体デバイスおよびその製造方法 - Google Patents
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Abstract
Description
(1)NA(x)≒NAmax×0.5×(1−erf((x−x0)/(σ×√2)))
Claims (28)
- 半導体デバイスを製造する方法であって、前記方法は、
イオン注入によって、第2の導電型の複数のフィールドゾーンを形成するステップを含み、前記複数のフィールドゾーンは、ドリフト層との第1のpn接合を第1の導電型の炭化ケイ素基板の終端領域内で形成し、
前記イオン注入によって、前記炭化ケイ素基板に入るドーパントの分布を横方向に変調することによって、前記複数のフィールドゾーンの少なくとも1つ内の水平方向の正味のドーパント分布は、少なくとも200nm以内で、正味の最大ドーパント濃度NmaxからNmax/eまで減少するように設定され、eは、オイラー数を表す、
方法。 - 前記複数のフィールドゾーンの隣接したフィールドゾーンは、前記第1の導電型の分離領域によって、互いから横方向に分離される、
請求項1に記載の方法。 - 前記複数のフィールドゾーンの隣接したフィールドゾーンは、互いに横方向に隣接し、
前記複数のフィールドゾーンの隣接したフィールドゾーン間の正味の最小ドーパント濃度Nminは、前記正味の最大ドーパント濃度Nmaxの多くても25%である、
請求項1に記載の方法。 - 前記複数のフィールドゾーン内の前記水平方向の正味のドーパント分布は、少なくとも500nm以内で、前記正味の最大ドーパント濃度NmaxからNmax/eまで減少するように設定される、
請求項1から3のいずれかに記載の方法。 - 前記複数のフィールドゾーン内の前記水平方向の正味のドーパント分布N(x)は、水平距離xの関数として、
Nmax×0.5×(1−erf((x−x0)/(σ×sqrt(2))))
に近似し、
σは、100nmより大きく、
x0は、N(x)が0.5×Nmaxに低下した横方向位置を示す、
請求項1から4のいずれかに記載の方法。 - 前記複数のフィールドゾーンは、閉じたフィールドリングを中央領域の周りで形成する、
請求項1から5のいずれかに記載の方法。 - 前記複数のフィールドゾーンは、フレームを中央領域の周りで形成する線に沿って形成される、
請求項1から5のいずれかに記載の方法。 - 前記複数のフィールドゾーン内の前記水平方向の正味のドーパント分布は、前記最大値NmaxからNmax/eまで単調に減少する、
請求項1から7のいずれかに記載の方法。 - ドーパントの前記分布を横方向に変調することは、コリメートされたイオンビームをビーム変更デバイスを介して方向付けることを含み、前記ビーム変更デバイスは、遮蔽セクションおよび前記遮蔽セクション間の発散セクションを備え、
前記遮蔽セクション内で、前記コリメートされたイオンビームのイオンのための透過性は、前記発散セクション内より低く、
前記発散セクションを通過する発散イオンビーム円錐は、前記炭化ケイ素基板の主要表面上の前記複数のフィールドゾーンの横方向の延在部を定義する、
請求項1から8のいずれかに記載の方法。 - 前記発散セクションは、へこみおよび突起を備え、前記へこみおよび前記突起内で、前記ビーム変更デバイスの垂直延在長は、第1の厚さとより大きい第2の厚さとの間で漸次に変化し、
前記遮蔽セクションの垂直延在長は、前記第2の厚さ以上である、
請求項9に記載の方法。 - 前記発散イオンビーム円錐は、前記主要表面の面内で互いから間隔があけられる、
請求項9または10に記載の方法。 - 前記遮蔽セクションの幅は、カーフ領域までの距離が減少するのに伴って、増加する、
請求項9から11のいずれかに記載の方法。 - 前記遮蔽セクションは、5以上の分子量を有するイオンが多くても2MeVの運動エネルギーで透過できない、
請求項9から12のいずれかに記載の方法。 - 急なマスク開口を有するバイナリマスク構造を前記炭化ケイ素基板の主要表面上に形成するステップと、
前記バイナリマスク構造の少なくとも部分を、リフロー温度より高い温度で熱処理し、前記バイナリマスク構造から、テーパー付きマスク溝を有するリフローマスクを形成するステップと、
をさらに含み、
前記リフローマスクは、ドーパントの前記水平分布を横方向に変調する、
請求項1から8のいずれかに記載の方法。 - 急なマスク開口を有するバイナリマスク構造を前記炭化ケイ素基板の主要表面上に形成するステップと、
コリメートされたイオンビームとマスク側壁との間の傾斜角(φ)での傾斜を用いて、かつ、前記炭化ケイ素基板と前記コリメートされたイオンビームとの間の回転運動を用いて、前記コリメートされたイオンビームを部分的に影にするステップと、
をさらに含み
前記影にするステップは、ドーパントの前記水平分布を横方向に変調する、
請求項1から8のいずれかに記載の方法。 - 前記注入の間、前記炭化ケイ素基板の主要表面に対する法線と前記コリメートされたイオンビームのビーム軸との間の前記傾斜角(φ)は、少なくとも20°である、
請求項15に記載の方法。 - 前記炭化ケイ素基板は、前記ビーム軸に垂直な面に対して前記傾斜角(φ)で傾斜した基板キャリア上に載置される、
請求項15または16に記載の方法。 - 前記注入の間、前記炭化ケイ素基板は、前記ビーム軸に平行な垂直軸の周りで回転する、
請求項17に記載の方法。 - 前記傾斜角(φ)は、前記注入の間、一定である、
請求項15から18のいずれかに記載の方法。 - 前記傾斜角(φ)は、前記注入の間、最小傾斜角と最大傾斜角との間で漸次に変化する、
請求項15から18のいずれかに記載の方法。 - 半導体デバイスであって、
前記半導体デバイスは、炭化ケイ素の半導体部分内に形成されるドリフトゾーンを備え、前記半導体部分は、中央領域および前記中央領域を囲む終端領域を備え、前記ドリフトゾーンは、前記半導体部分の第1の表面から離れており、
前記半導体デバイスは、前記終端領域内の複数のフィールドゾーンを備え、前記複数のフィールドゾーンは、前記ドリフトゾーンとの第1のpn接合を形成し、前記複数のフィールドゾーンの少なくとも1つ内の、前記第1の表面に平行な水平方向の正味のドーパント分布N(x)は、少なくとも200nmの距離内で、最大値NmaxからNmax/eまで減少し、eは、オイラー数を表す、
半導体デバイス。 - 前記半導体デバイスは、前記ドリフトゾーンの導電型の分離領域をさらに備え、前記分離領域は、前記複数のフィールドゾーンの隣接したフィールドゾーンを横方向に分離する、
請求項21に記載の半導体デバイス。 - 前記複数のフィールドゾーンの隣接したフィールドゾーンは、互いに横方向に隣接し、前記複数のフィールドゾーンの隣接したフィールドゾーン間の正味の最小ドーパント濃度Nminは、前記正味の最大ドーパント濃度Nmaxの多くても25%である、
請求項21に記載の半導体デバイス。 - 前記半導体デバイスは、前記複数のフィールドゾーンの導電型の接合終端領域をさらに備え、
前記接合終端領域の部分は、前記複数のフィールドゾーンの隣接したフィールドゾーンを横方向に分離する、
請求項21に記載の半導体デバイス。 - 前記複数のフィールドゾーンの少なくともいくつかは、閉じたフィールドリングを前記中央領域の周りで形成する、
請求項21から24のいずれかに記載の半導体デバイス。 - 前記複数のフィールドゾーンの少なくともいくつかは、フレームを前記中央領域の周りで形成する線に沿って配置される、
請求項21から25のいずれかに記載の半導体デバイス。 - 前記半導体デバイスは、前記複数のフィールドゾーンの導電型の接合終端延在部をさらに備え、前記接合終端延在部は、前記中央領域内に形成されるアノード/ボディ領域に直接隣接し、
前記接合終端延在部内の、前記第1の表面に平行な水平方向の正味のドーパント分布N(x)は、少なくとも200nmの距離内で、最大値NmaxからNmax/eまで減少する、
請求項21から26のいずれかに記載の半導体デバイス。 - 前記複数のフィールドゾーンは、フローティングに構成される、
請求項21から27のいずれかに記載の半導体デバイス。
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