JP5445944B2 - 埋め込みゲートを具えたdramトランジスタ、およびその製造方法 - Google Patents
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Claims (41)
- 半導体基板上に形成された複数のメモリセルを含むメモリアレイであって、
前記複数のメモリセルの各々が、
ゲート、チャネル領域、および一対のソース/ドレイン領域を各々が含む第一および第二の電界効果トランジスタであって、前記ゲートが、前記基板の半導体材料内に形成された一対の開口部のうちの対応する開口部の中に設けられ、前記一対のソース/ドレイン領域のうちの一方が、前記ゲート同士の基板面方向の中間に設けられて、かつ前記第一および第二の電界効果トランジスタにより共有され、前記第一および第二の電界効果トランジスタの前記一対のソース/ドレイン領域のうちの他方の各々が、対応する電界効果トランジスタのゲートの基板面方向の外方に設けられ、前記開口部は、前記ゲートの上面の高さが前記一対のソース/ドレイン領域の底面の高さと略同一となるよう、前記ゲートによって充填されている、第一および第二の電界効果トランジスタと、
前記一対の開口部を相互接続する、導電性材料で充填された相互接続トレンチと、
前記ゲートの高さ方向の外方に設けられ、かつ、前記一対のソース/ドレイン領域のうちの前記他方の各々と電気的に接続されている、導電データ線と、
前記共有されたソース/ドレイン領域と電気的に接続されている電荷蓄積デバイスと、
を含むメモリアレイ。 - 前記半導体材料がバルク半導体材料を含む、請求項1記載のメモリアレイ。
- 前記バルク半導体材料がバルク単結晶珪素を含む、請求項2記載のメモリアレイ。
- 前記一対のソース/ドレイン領域のうちの前記一方が、前記ゲートの高さ方向の外方に設けられている、請求項1記載のメモリアレイ。
- 前記一対のソース/ドレイン領域のうちの前記他方の各々が、前記ゲートの高さ方向の外方に設けられている、請求項1記載のメモリアレイ。
- 前記一対のソース/ドレイン領域のうちの前記一方、および前記一対のソース/ドレイン領域のうちの前記他方の各々が、前記ゲートの高さ方向の外方に設けられている、請求項1記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方に設けられている、請求項1記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方であって、かつ前記導電データ線の高さ方向の外方に、設けられている、請求項1記載のメモリアレイ。
- 各チャネル領域は、少なくとも1つの断面内において、前記共有されたソース/ドレイン領域と前記他方のソース/ドレイン領域の各々との間に延びる電流路を含み、該電流路は、相互接続された第一および第二のほぼ垂直な区域を含んでいる、請求項1記載のメモリアレイ。
- 前記相互接続トレンチ内の前記導電性材料が、前記第一および第二の電界効果トランジスタの前記ゲート同士を電気的に相互接続している、請求項1記載のメモリアレイ。
- 各チャネル領域は、少なくとも1つの断面内において、前記共有されたソース/ドレイン領域と前記他方のソース/ドレイン領域の各々との間に延びる電流路を含み、該電流路は、相互接続された第一および第二のほぼ垂直な区域を含んでおり、
前記導電性材料が、前記第一および第二の電界効果トランジスタの前記ゲート同士を電気的に相互接続している、請求項1記載のメモリアレイ。 - 前記複数のメモリセルがDRAMセルを含む、請求項1記載のメモリアレイ。
- 半導体基板上に形成された複数のメモリセルを含むメモリアレイであって、
前記複数のメモリセルの各々が、
ゲート、チャネル領域、および一対のソース/ドレイン領域を各々が含む第一および第二の電界効果トランジスタであって、前記ゲートが、前記基板の半導体材料内に形成された一対の開口部のうちの対応する開口部の中に設けられ、前記一対のソース/ドレイン領域のうちの一方が、前記ゲート同士の基板面方向の中間に設けられて、かつ前記第一および第二の電界効果トランジスタにより共有され、前記第一および第二の電界効果トランジスタの前記一対のソース/ドレイン領域のうちの他方の各々が、対応する電界効果トランジスタのゲートの基板面方向の外方に設けられ、前記開口部は、前記ゲートの上面の高さが前記一対のソース/ドレイン領域の底面の高さと略同一となるよう、前記ゲートによって充填されており、各チャネル領域は、少なくとも1つの断面内において、前記共有されたソース/ドレイン領域と前記他方のソース/ドレイン領域の各々との間に延びる電流路を含み、該電流路は、相互接続された第一および第二のほぼ垂直な区域を含んでいる、第一および第二の電界効果トランジスタと、
前記一対のソース/ドレイン領域のうちの前記他方の各々に電気的に接続されている導電データ線と、
前記第一および第二の電界効果トランジスタの前記ゲートの各々を相互接続する、導電性材料で充填された相互接続トレンチと、
前記共有されたソース/ドレイン領域と電気的に接続されている電荷蓄積デバイスと、
を含むメモリアレイ。 - 前記第一および第二のほぼ垂直な区域が、高さ方向の内側の端部を含み、前記少なくとも1つの断面内における前記電流路が、前記第一および第二のほぼ垂直な区域の間であって前記高さ方向の内側の端部に隣接して設けられた相互接続区域を含む、請求項13記載のメモリアレイ。
- 前記少なくとも1つの断面における前記電流路が、前記第一および第二のほぼ垂直な区域の間に設けられたほぼ水平な相互接続区域を含む、請求項13記載のメモリアレイ。
- 前記導電データ線が、前記ゲートの高さ方向の外方に設けられている、請求項13記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方に設けられている、請求項13記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方であって、かつ前記導電データ線の高さ方向の外方に、設けられている、請求項13記載のメモリアレイ。
- 前記導電データ線がビット線を含み、前記複数のメモリセルがDRAMセルを含む、請求項13記載のメモリアレイ。
- 半導体基板上に形成された複数のメモリセルを含むメモリアレイであって、
前記複数のメモリセルの各々が、
ゲート、チャネル領域、および一対のソース/ドレイン領域を各々が含む第一および第二の電界効果トランジスタであって、前記ゲートが、前記基板の半導体材料内に形成された一対の開口部のうちの対応する開口部の中に設けられ、前記一対のソース/ドレイン領域のうちの一方が、前記ゲート同士の基板面方向の中間に設けられて、かつ前記第一および第二の電界効果トランジスタにより共有されており、前記第一および第二の電界効果トランジスタの前記一対のソース/ドレイン領域のうちの他方の各々が、対応する電界効果トランジスタのゲートのそれぞれの基板面方向の外方に設けられており、前記開口部は、前記ゲートの上面の高さが前記一対のソース/ドレイン領域の底面の高さと略同一となるよう、前記ゲートによって充填されている、第一および第二の電界効果トランジスタと、
前記第一および第二の電界効果トランジスタの前記ゲート同士を相互接続する、導電性材料で充填された相互接続トレンチと、
前記一対のソース/ドレイン領域のうちの前記他方の各々に電気的に接続されている導電データ線と、
前記共有されたソース/ドレイン領域と電気的に接続されている電荷蓄積デバイスと、
を含むメモリアレイ。 - 前記導電データ線が、前記ゲートの高さ方向の外方に設けられている、請求項20記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方に設けられている、請求項20記載のメモリアレイ。
- 前記電荷蓄積デバイスが、前記ゲートの高さ方向の外方であって、かつ前記導電データ線の高さ方向の外方に、設けられている、請求項20記載のメモリアレイ。
- 前記電荷蓄積デバイスがキャパシタを含む、請求項20記載のメモリアレイ。
- バルク半導体基板上に形成された複数のメモリセルを含むメモリアレイであって、
前記複数のメモリセルの各々が、
ゲート、チャネル領域、および一対のソース/ドレイン領域を各々が含む第一および第二の電界効果トランジスタであって、前記ゲートが、前記バルク半導体基板のバルク半導体材料の内部に形成されたトレンチの中に設けられ、前記一対のソース/ドレイン領域のうちの一方が、前記ゲート同士の基板面方向の中間のバルク半導体材料の中に設けられ、かつ前記第一および第二の電界効果トランジスタにより共有されており、前記第一および第二の電界効果トランジスタの前記一対のソース/ドレイン領域のうちの他方の各々が、バルク半導体材料の中であって対応する電界効果トランジスタのゲートのそれぞれの基板面方向の外方に設けられ、前記トレンチは、前記ゲートの上面の高さが前記一対のソース/ドレイン領域の底面の高さと略同一となるよう、前記ゲートによって充填されており、各チャネル領域は、少なくとも1つの断面内において、前記共有されたソース/ドレイン領域と前記他方のソース/ドレイン領域の各々との間に延びる電流路をバルク半導体材料中に含み、該電流路は、相互接続された第一および第二のほぼ垂直な区域を含んでいる、第一および第二の電界効果トランジスタと、
前記第一および第二の電界効果トランジスタの前記ゲート同士を相互接続する、導電性材料で充填された相互接続トレンチと、
前記ゲートの高さ方向の外方に設けられ、かつ、前記一対のソース/ドレイン領域のうちの前記他方の各々に電気的に接続されている、導電データ線と、
前記共有されたソース/ドレイン領域と電気的に接続され、かつ、前記導電データ線の高さ方向の外方に設けられた、電荷蓄積デバイスと、
を含むメモリアレイ。 - 前記導電性材料が金属を含む、請求項25記載のメモリアレイ。
- 前記金属がTiNを含む、請求項26記載のメモリアレイ。
- 半導体基板上に形成された複数のメモリセルを含むメモリアレイであって、
前記複数のメモリセルの各々が、
ゲート、チャネル領域、および一対のソース/ドレイン領域を各々が含む第一および第二の電界効果トランジスタであって、前記ゲートが、前記基板の半導体材料内に形成された一対の開口部のうちの対応する開口部の中に設けられ、前記一対のソース/ドレイン領域のうちの一方が、前記ゲート同士の基板面方向の中間に設けられて、かつ前記第一および第二の電界効果トランジスタにより共有され、前記第一および第二の電界効果トランジスタの前記一対のソース/ドレイン領域のうちの他方の各々が、対応する電界効果トランジスタのゲートの基板面方向の外方に設けられ、前記開口部は、前記ゲートの上面の高さが前記一対のソース/ドレイン領域の底面の高さと略同一となるよう、前記ゲートによって充填されている、第一および第二の電界効果トランジスタと、
前記第一および第二の電界効果トランジスタの前記ゲート同士が互いに結線されるよう、前記第一および第二の電界効果トランジスタの前記ゲート同士を相互接続する、導電性材料で充填された相互接続トレンチと、
前記ソース/ドレイン領域のうちの二つに結線された導電データ線と、
前記ソース/ドレイン領域のうちの前記二つ以外の少なくとも1つに結線された電荷蓄積デバイスと、
を含むメモリアレイ。 - 前記ソース/ドレイン領域のうちの前記少なくとも1つが、前記ゲート同士の基板面方向の中間に設けられている、請求項28記載のメモリアレイ。
- 前記ソース/ドレイン領域のうちの1つが、前記第一および第二の電界効果トランジスタによって共有され、前記電荷蓄積デバイスが、前記共有された1つのソース/ドレイン領域に接続されている、請求項28記載のメモリアレイ。
- 前記半導体基板の半導体材料の内部に形成され且つ前記ゲート同士の間に延びる少なくとも二つのトレンチの中に設けられた導電性材料によって、前記ゲート同士が互いに結線されている、請求項28記載のメモリアレイ。
- 前記電荷蓄積デバイスが前記ゲートの高さ方向の外方に設けられている、請求項28記載のメモリアレイ。
- 前記導電データ線が前記ゲートの高さ方向の外方に設けられている、請求項28記載のメモリアレイ。
- 各チャネル領域は、少なくとも1つの断面内において、ソース/ドレイン領域間に延びる電流路を含み、該電流路は、相互接続された第一および第二のほぼ垂直な区域を含んでいる、請求項28記載のメモリアレイ。
- メモリアレイを製造する方法であって、
半導体基板中に、活性領域の線とトレンチ分離領域の線とを交互に並べるように形成するステップと、
前記活性領域および前記トレンチ分離領域の中へとエッチングを施すことで、交互に並んだ前記活性領域の前記線と前記トレンチ分離領域の前記線に対して概して直交するように、トレンチの一連の対を形成するステップと、
前記半導体基板の中へとエッチングを施すことで、各対をなす前記トレンチの各々を相互接続する少なくとも1つの相互接続トレンチを形成するステップと、
前記トレンチの一連の対の内部および前記相互接続トレンチの内部に導電性材料を充填することで、前記一連の対の各々に対して、互いに電気的に接続された一対のワード線を形成するステップと、
前記活性領域内であって、各対をなす前記トレンチの各々の中間と、各対をなす前記トレンチの各々の基板面方向の外部とに、ソース/ドレイン領域を形成するステップであって、前記トレンチ内に充填された前記ワード線の上面の高さと、前記ソース/ドレイン領域の底面の高さとが略同一である、ステップと、
各対をなす前記トレンチの各々の基板面方向の外方に設けられた前記ソース/ドレイン領域と電気的に接続された導電データ線を形成するステップと、
各対をなす前記トレンチの各々の中間に設けられた前記ソース/ドレイン領域のそれぞれと電気的に接続された電荷蓄積デバイスを形成するステップと、
を含む方法。 - エッチングを施すことで前記トレンチの一連の対を形成するステップ、および、エッチングを施すことで前記相互接続トレンチを形成するステップが、共通のマスキングステップを含む、請求項35記載の方法。
- エッチングを施すことで前記トレンチの一連の対を形成するステップ、および、エッチングを施すことで前記相互接続トレンチを形成するステップが、共通のエッチングステップを含む、請求項35記載の方法。
- 前記導電性材料を充填するステップが、導電性を有する材料を、前記トレンチの一連の対の中および前記相互接続トレンチの中の少なくとも一部に、同時に堆積するステップを含む、請求項35記載の方法。
- 各対毎にひとつの相互接続トレンチのみをエッチングにより形成するステップを含む、請求項35記載の方法。
- 各対毎に二つの相互接続トレンチのみをエッチングにより形成するステップを含む、請求項35記載の方法。
- 各対毎に複数の相互接続トレンチをエッチングにより形成するステップを含む、請求項35記載の方法。
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US8394699B2 (en) | 2013-03-12 |
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US7772632B2 (en) | 2010-08-10 |
TW200816454A (en) | 2008-04-01 |
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CN101506966B (zh) | 2010-09-01 |
KR101074594B1 (ko) | 2011-10-17 |
US20100273303A1 (en) | 2010-10-28 |
SG174730A1 (en) | 2011-10-28 |
TWI362743B (en) | 2012-04-21 |
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