JP2016154218A - トランジスタセルおよびエンハンスメントセルを有する半導体装置 - Google Patents
トランジスタセルおよびエンハンスメントセルを有する半導体装置 Download PDFInfo
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- JP2016154218A JP2016154218A JP2015249516A JP2015249516A JP2016154218A JP 2016154218 A JP2016154218 A JP 2016154218A JP 2015249516 A JP2015249516 A JP 2015249516A JP 2015249516 A JP2015249516 A JP 2015249516A JP 2016154218 A JP2016154218 A JP 2016154218A
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Abstract
Description
100a 半導体層
101 第1の面
101a 加工面
110 ソース区域
113 第2の遮断区域
115 ボディ区域
115x 反転チャネル
117 電荷キャリア輸送区域
117y 二次反転層
118 Pドープ領域
120 ドリフト構造
120x 別の反転層
120y 反転層
121 ドリフト区域
123 高ドープ遮断区域
125 障壁区域
129 電界停止区域
130 台座層
131 第1の区域
132 第2の区域
150 第1のゲート構造
150x 第1の領域
150z 第1のトレンチ
151 第1のゲート誘電体
151a 第1の部分
151b 第2の部分
151c 嘴部分
155 第1のゲート電極
160 第2のゲート構造
160x 第2の領域
160z 第2のトレンチ
161 第2のゲート誘電体
165 第2のゲート電極
170 メサ部
170a 活性メサ部
170b ダイオードメサ部
170c アイドルセル部
180 ゲート構造
181 フィールド誘電体
185 フィールド電極
190 複合ゲート構造
205 絶縁体層
210 誘電体構造
305 コンタクト構造
310 第1の負荷電極
320 第2の負荷電極
400 遅延ユニット
410 第1の経路
411 第1の内部抵抗
420 第2の経路
422 第2の内部抵抗
423 整流素子
500 半導体装置
500a 半導体基板
501 半導体ダイオード
502 RC−IGBT
503 逆遮断型IGBT
602 トレンチエッチマスク
602a 酸窒化層
602b 窒化珪素層
603 残り部分
610 トランジスタセルアレイ
612 コンフォーマル犠牲酸化物層
613 残り部分
614 犠牲酸化物ライナ
615 残り部分
622 マスクライナ
623 ウエットエッチマスク
624 ウエットエッチマスク
625 スペーサマスク
632 別の誘電体ライナ
643 マスクライナエッチマスク
643a 開口
650 アイドル領域
652 埋め込み多結晶半導体材料
672 多結晶シリコンスペーサ
673 酸化物スペーサ
683 注入マスク
683a 開口
684 損傷区域
685 嘴部分
690 端領域
701 スイッチドモード電源
702 電子回路
710 ハーフブリッジ回路
711,712 スイッチング素子
720 ゲート駆動回路
741 誘導素子
742 負荷
Claims (23)
- ドリフト構造(120)とともに第1のpn接合(pn1)を形成するボディ区域(115)を含むトランジスタセル(TC)であって、第1の制御信号(C1)が第1の閾値(Vthx)を越えると前記ドリフト構造(120)と第1の負荷電極(310)間の接続部の一部を形成する反転チャネル(115x)を前記ボディ区域(115)内に形成するように構成された、トランジスタセル(TC)と、
その後縁が前記第1の制御信号(C1)の後縁に対して遅延される第2の制御信号(C2)を生成するように構成された遅延ユニット(400)と、
前記第2の制御信号(C2)が前記第1の閾値(Vthx)より低い第2の閾値(Vthy)を下回ると前記ドリフト構造(120)内に反転層(120y)を形成するように構成されたエンハンスメントセル(EC)であって、前記反転層(120y)は少数電荷キャリアエミッタとして効果的である、エンハンスメントセル(EC)とを含む半導体装置。 - 前記エンハンスメントセル(EC)は、前記ドリフト構造(120)とともに別の第1のpn接合(pn1)を形成する電荷キャリア輸送区域(117)を含む、請求項1に記載の半導体装置。
- 前記電荷キャリア輸送区域(117)は前記ボディ区域(115)に直接隣接する、請求項2に記載の半導体装置。
- 前記電荷キャリア輸送区域(117)はボディ区域(115)から分離される、請求項2に記載の半導体装置。
- 前記エンハンスメントセル(EC)は、前記第2の制御信号(C2)が前記第1の閾値(Vthx)を越えると前記第1の負荷電極(310)から電気的に切断される二次反転層(117y)を前記電荷キャリア輸送区域(117)内に形成するように構成される、請求項2乃至4のいずれか一項に記載の半導体装置。
- 前記エンハンスメントセル(EC)は、前記電荷キャリア輸送区域(117)とユニポーラホモ接合を形成するとともに前記二次反転層(117y)を遮断する高ドープ第2の遮断区域(113)を含む、請求項5に記載の半導体装置。
- 前記エンハンスメントセル(EC)は、前記電荷キャリア輸送区域(117)とpn接合を形成するとともに前記第1の負荷電極(310)と電気的に接続されるいかなるドープ区域も欠く、請求項5または6に記載の半導体装置。
- 前記トランジスタセル(TC)は前記第1の制御信号(C1)が印加される第1のゲート構造(150)を含み、
前記トランジスタセル(TC)は前記第1の制御信号(C1)が前記第2の閾値(Vthy)を下回ると前記ドリフト構造(120)内に別の反転層(120x)を形成するように構成され、
前記別の反転層(120x)の少なくとも一部は前記ボディ区域(115)から切断される、請求項1乃至7のいずれか一項に記載の半導体装置。 - 前記トランジスタセル(TC)は、前記第1のゲート構造(150)に沿って高ドープの第1の遮断区域(123)を含み、
前記第1の遮断区域(123)は、前記ドリフト構造(120)とユニポーラホモ接合を形成するとともに前記ボディ区域(115)から前記別の反転層(120x)の少なくとも一部を切断する、請求項8に記載の半導体装置。 - 前記第1のゲート構造(150)は、第1のゲート電極(155)と、前記ボディ区域(115)と前記ドリフト構造(120)から前記第1のゲート電極(155)を分離する第1のゲート誘電体(151)とを含み、
前記第1のゲート誘電体(151)は幅が増加された嘴部分(151c)を含み、
前記嘴部分(151c)は、前記第1の制御信号(C1)の低レベル(VL)時に前記ボディ区域(115)から前記別の反転層(120x)の少なくとも一部を切断する、請求項8または9に記載の半導体装置。 - 前記嘴部分(151c)は前記第1のゲート構造(150)から外側に延在する、請求項10に記載の半導体装置。
- 前記トランジスタセル(TC)は前記第1の制御信号(C1)が印加される第1のゲート構造(150)を含み、
前記第1のゲート構造(150)は、第1のゲート電極(155)と、第1のゲート誘電体(151)と、前記ボディ区域(115)から前記第1のゲート電極(155)を分離する前記第1のゲート誘電体(151)の第1の部分(151a)と、前記ドリフト構造(120)から前記第1のゲート電極(155)を分離する前記第1のゲート誘電体(151)の第2の部分(115b)とを含み、
前記第2の部分(151b)は、前記第1の部分(151a)より厚く、前記第1の制御信号(C1)の低レベル(VL)時に前記ドリフト構造(120)内の前記第1のゲート構造(150)に沿って反転層の形成することを抑制するように構成される、請求項1乃至7のいずれか一項に記載の半導体装置。 - 前記トランジスタセル(TC)は前記第1の制御信号(C1)が印加される第1のゲート構造(150)を含み、
前記第1のゲート構造(150)は、第1のゲート電極(155)と、前記ボディ区域(115)と前記ドリフト構造(120)から前記第1のゲート電極(155)を分離する第1のゲート誘電体(151)とを含み、
前記エンハンスメントセル(EC)は、前記第2の制御信号(C2)が印加される第2のゲート構造(160)を含み、
前記第1のゲート構造(150)は前記第2のゲート構造(160)より低度に前記ドリフト構造(120)と重畳する、請求項1乃至7のいずれか一項に記載の半導体装置。 - 前記エンハンスメント層(EC)の前記反転層(120y)は、前記第2の制御信号(C2)が前記第2の閾値(Vth2)を下回ると、前記トランジスタセル(TC)の前記ボディ区域(115)に直接隣接する、請求項1に記載の半導体装置。
- 前記トランジスタセル(TC)は前記第1の制御信号(C1)が印加される第1のゲート構造(150)を含み、
前記第1のゲート構造(150)は、第1のゲート電極(155)と、前記ボディ区域(115)から前記第1のゲート電極(155)を分離する第1のゲート誘電体(151)とを含み、
前記エンハンスメントセル(EC)は、前記第2の制御信号(C2)が印加される第2のゲート構造(160)を含み、
前記第2のゲート構造(160)は、第2のゲート電極(165)と、前記ドリフト構造(120)から前記第2のゲート電極(165)を分離する第2のゲート誘電体(161)と、前記第1のゲート構造(150)と前記第2のゲート構造(160)間に挟まれた絶縁体層(205)とを含む、請求項14に記載の半導体装置。 - 複数のトランジスタセル(TC)およびエンハンスメントセル(EC)がトランジスタセルアレイ(610)を形成し、
前記トランジスタセル(TC)と前記エンハンスメントセル(EC)の少なくとも一方の分布密度は前記トランジスタセルアレイ(610)の端までの距離の減少とともに変化する、請求項1乃至15のいずれか一項に記載の半導体装置。 - 前記トランジスタセルアレイ(610)内に形成されるアイドルセル(IC)をさらに含む、請求項16に記載の半導体装置。
- 前記ドリフト構造(120)は、低ドープドリフト区域(121)と、前記ドリフト区域(121)と前記ボディ区域(125)間に挟まれた高ドープ障壁区域(125)とを含む、請求項1乃至17のいずれか一項に記載の半導体装置。
- 前記遅延ユニット(400)は、ゲートノードへ接続される第1の経路(410)と、前記ゲートノードへ接続される第2の経路(420)とを含み、
前記ゲートノードへ印可される信号に応じて前記第1の経路(410)は前記第1の制御信号(C1)を、前記第2の経路(420)は前記第2の制御信号(C2)をそれぞれ出力する、請求項1乃至18のいずれか一項に記載の半導体装置。 - 前記第1の経路(410)は第1の内部抵抗(411)を含み、前記第2の経路(420)は前記第1の内部抵抗(411)より大きな第2の内部抵抗(422)を含む、請求項19に記載の半導体装置。
- 前記第2の経路(420)は前記第1の内部抵抗(411)と並列に整流素子(423)を含み、
前記整流素子(423)は信号前縁の前記第1の内部抵抗(411)をバイパスする、請求項19または20に記載の半導体装置。 - 2つのスイッチング素子(711、712)を含むハーフブリッジ回路(710)を含む電力モジュールであって、前記スイッチング素子(711、712)の少なくとも1つは、
ドリフト構造(120)とともに第1のpn接合(pn1)を形成するボディ区域(115)を含むトランジスタセル(TC)であって、第1の制御信号(C1)が第1の閾値(Vthx)を越えると前記ドリフト構造(120)と第1の負荷電極(310)間の接続部の一部を形成する反転チャネル(115x)を前記ボディ区域(115)内に形成するように構成された、トランジスタセル(TC)と、
その後縁が前記第1の制御信号(C1)の後縁に対して遅延される第2の制御信号(C2)を生成するように構成された遅延ユニット(400)と、
前記第2の制御信号(C2)が前記第1の閾値(Vthx)より低い第2の閾値(Vthy)を下回ると前記ドリフト構造(120)内に反転層(120y)を形成するように構成されたエンハンスメントセル(EC)であって、前記反転層(120y)は少数電荷キャリアエミッタとして効果的である、エンハンスメントセル(EC)とを含む電力モジュール。 - 第2の制御信号(C2)が第2の閾値(Vthy)を下回ると、ドリフト構造(120)内に反転層(120y)を形成するように構成されたエンハンスメントセル(EC)であって、前記反転層(120y)は少数電荷キャリア導体として効果的である、エンハンスメントセル(EC)と、
その後縁が前記第2の制御信号(C2)の後縁に対して遅延される第1の制御信号(C1)を生成するように構成された遅延ユニット(400)と、
前記ドリフト構造(120)とともに第1のpn接合(pn1)を形成するボディ区域(115)を含むトランジスタセル(TC)であって、前記第1の制御信号(C1)が前記第2の閾値(Vthy)より高い第1の閾値(Vthx)を越えると前記ドリフト構造(120)と第1の負荷電極(310)間の接続部の一部を形成する反転チャネル(115x)を前記ボディ区域(115)内に形成するように構成された、トランジスタセル(TC)とを含む半導体装置。
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US10825906B2 (en) | 2020-11-03 |
US9997602B2 (en) | 2018-06-12 |
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JP6080938B2 (ja) | 2017-02-15 |
US20180277642A1 (en) | 2018-09-27 |
DE102014119543B4 (de) | 2018-10-11 |
DE102014119543A1 (de) | 2016-06-23 |
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