JP5876044B2 - 低濃度ドープドレインを有する化学的感応性センサ - Google Patents
低濃度ドープドレインを有する化学的感応性センサ Download PDFInfo
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Description
本出願は、2010年7月3日に出願された米国仮特許出願第61/361,403号の利益を主張し、その内容は、その全体が参照により本明細書に組み込まれる。
電子装置および構成部品は、特に、様々な化学的および生物的反応の検出および測定、ならびに各種化合物の識別、検出および測定のために、化学および生物学(より一般には「生命科学」)において多数の応用を見出した。このような電子装置の1つは、イオン感応電界効果トランジスタと称され、「ISFET」(またはpHFET)として、関連文献においてしばしば示されている。ISFETは、溶液の水素イオン濃度(一般的に「pH」として示される)の測定を容易にするために、主として学術的な研究コミュニティにおいて、従来から調査されている。
以下に、本発明の基本的な諸特徴および種々の態様を列挙する。
[1]
基板上のゲート電極に電気的に連結された、フローティングゲートと、
ドレイン端子接続と、
ソース端子接続と、
各ドープ領域が低濃度ドープ領域および高濃度ドープ領域を含む、該基板内の1対のドープ領域と
を備え、
該低濃度ドープ領域の各々が、該基板の該ゲート電極の下に延伸しており、かつ該高濃度ドープ領域の各々が、該ドレイン端子および該ソース端子にそれぞれ連結されるように延伸している、
化学的感応性センサ。
[2]
試料を受容するためのマイクロウェル
をさらに備える、[1]に記載の化学的感応性センサ。
[3]
前記マイクロウェルが、前記フローティングゲートに隣接する該ウェルの底に酸化物層を有する、[1]に記載の化学的感応性センサ。
[4]
寄生容量が、前記ゲート電極と前記低濃度ドープ領域との間の下方に存在する、[1]に記載の化学的感応性センサ。
[5]
前記化学的感応性センサの利得が、前記低濃度ドープ領域において用いられるドーパントの量によって修正される、[1]に記載の化学的感応性センサ。
[6]
前記低濃度ドープ領域が、前記高濃度ドープ領域のドーパント濃度レベル未満であるドーパント濃度レベルでドープされる、[1]に記載の化学的感応性センサ。
[7]
基板上のゲート電極に電気的に連結された、フローティングゲートと、
ドレイン端子接続と、
ソース端子接続と、
該基板上に形成され、1対の電極の一方が該ゲート電極のいずれかの側にある、該1対の電極と、
1対のドープ領域の一方が低濃度ドープ領域および高濃度ドープ領域を含む、該基板内の該1対のドープ領域と
を備え、
該低濃度ドープ領域が、該電極のそれぞれ1つの下に延伸しており、かつ各対の該高濃度ドープ領域が、ドレイン端子およびソース端子にそれぞれ連結されるように延伸している、
化学的感応性センサ。
[8]
生体材料を受容するためのマイクロウェル
をさらに備える、[7]に記載の化学的感応性センサ。
[9]
前記マイクロウェルが、前記フローティングゲートに隣接する該ウェルの底に酸化物層を有する、[7]に記載の化学的感応性センサ。
[10]
前記1対の電極の一方が、基準電極として、および電荷パケットのためのバリアまたはウェルとして機能する、[1]に記載の化学的感応性センサ。
[11]
前記1対の電極の一方が、拡散電極として機能し、かつ電荷パケットを促進する、[1]に記載の化学的感応性センサ。
[12]
ゲート電極に電気的に連結された、フローティングゲートと、
低濃度ドープ領域および高濃度ドープ領域を伴って形成された、ソースと、
低濃度ドープ領域および高濃度ドープ領域を伴って形成された、ドレインと
を備え、
該ソースの該低濃度ドープ領域および該ドレインの該低濃度ドープ領域が、チャネル領域内の該フローティングゲートに隣接して互いに向かって延伸している、
化学的感応性センサ。
[13]
前記ソースおよび前記ドレインの前記高濃度ドープ領域が、該ソースと該ドレインとの前記低濃度ドープ領域よりも大きなドーパント濃度を含む、[12]に記載の化学的感応性センサ。
[14]
前記ソースおよび前記ドレインの前記高濃度ドープ領域が、前記チャネル領域および前記ゲート領域から離れて延伸している、[12]に記載の化学的感応性センサ。
[15]
前記ソースの前記高濃度ドープ領域が、金属接点に連結される、[12]に記載の化学的感応性センサ。
[16]
前記ドレインの前記高濃度ドープ領域が、金属接点に連結される、[12]に記載の化学的感応性センサ。
[17]
前記ソースの前記低濃度ドープ領域の容量が、前記ドレインの前記低濃度ドープ領域よりも大きい、[12]に記載の化学的感応性センサ。
[18]
前記ソースと前記ドレインとの前記低濃度ドープ領域が、前記化学的感応性センサの利得を制限する静電容量の増大をもたらす、[12]に記載の化学的感応性センサ。
[19]
第1の導電型のドーパントで基板を形成するステップと、
該基板を形成するために用いられたものと同じ導電型であるが該基板の該ドーパントよりも濃度を低くしたドーパントを用いて、エピタキシャル層を構築するステップと、
形成された該エピタキシャル層上に、該基板を形成するために用いられた該第1の導電型のドーパントとは異なる第2の導電型のドーパントから電極層を形成するステップであって、該電極層および該基板の双方における該ドーパントの濃度がほぼ同じである、ステップと、
ゲートおよび電極を製作するために該電極層をマスクしてエッチングするステップと、
多方向注入技術(multidirectional implant technique)を用いて、該電極のうちの1つに隣接した第1の低濃度ドープ領域を生成するステップであって、該第1の低濃度ドープ領域が、該エピタキシャル層のドーパントとは反対側の導電型のドーパントから形成される、ステップと、
該ゲート、該電極および該低濃度ドープ領域と同様の導電型のドーパントから、該ゲートに隣接した該電極に自己整列した拡散ノードを生成するステップであって、該拡散ノードの1番目のものが該第1の低濃度ドープ領域に隣接する、ステップと、
絶縁体、誘電体、導電層および金属層が交互に重なった層により、フローティングゲート電極、該拡散領域の上の電極、および電極のための接点を形成するステップと
を含む、化学的感応性センサの作製方法。
[20]
多方向注入技術を用いて、前記電極のうちの1つに隣接する第2の低濃度ドープ領域を生成するステップ
をさらに含み、
該第2の低濃度ドープ領域が、前記エピタキシャル層のドーパントとは反対側の導電型のドーパントから形成される、
[19]に記載の方法。
[21]
前記拡散ノードの2番目のものが、前記第2の低濃度ドープ領域に隣接する、[20]に記載の方法。
[22]
拡散領域の上に追加電極を形成するステップ
をさらに含む、[19]に記載の方法。
[23]
前記フローティングゲートの上の試料を保持するためにマイクロウェルを形成するステップ
をさらに含む、[19]に記載の方法。
実施形態は、修正された利得をもつ化学的感応性センサを提供する。化学的感応性センサは、基板内に、マイクロウェル、フローティングゲート端子、ドレイン端子、ソース端子および1対のドープ領域を含んでもよい。マイクロウェルは、化学反応において用いられる試料を受容してもよい。フローティングゲートは、基板上のゲート電極に電気的に連結されてもよい。ドレイン端子接続およびソース端子接続は、化学的感応性センサの電気端子であってもよい。基板内の対のドープ領域は、各々、低濃度ドープ領域および高濃度ドープ領域を含んでもよい。各々の低濃度ドープ領域は、基板上のゲート電極の下に延伸してもよく、かつ各々の高濃度ドープ領域は、ドレイン端子およびソース端子にそれぞれ連結されるように延伸してもよい。
Claims (18)
- 基板上のゲート電極に電気的に連結された、フローティングゲートと、
ドレイン端子接続と、
ソース端子接続と、
各ドープ領域が低濃度ドープ領域および高濃度ドープ領域を含む、該基板内の1対のドープ領域と、
試料を受容するためのマイクロウェルと、
を備え、
該低濃度ドープ領域の各々が、該基板の該ゲート電極の下に延伸しており、かつ該高濃度ドープ領域の各々が、該ドレイン端子および該ソース端子にそれぞれ連結されるように延伸しており、かつ、前記マイクロウェルが、前記フローティングゲートに隣接する該ウェルの底に酸化物層を有する、
化学的感応性センサ。 - 寄生容量が、前記ゲート電極と前記低濃度ドープ領域との間の下方に存在する、請求項1に記載の化学的感応性センサ。
- 前記化学的感応性センサの利得が、前記低濃度ドープ領域において用いられるドーパントの量によって修正される、請求項1に記載の化学的感応性センサ。
- 前記低濃度ドープ領域が、前記高濃度ドープ領域のドーパント濃度レベル未満であるドーパント濃度レベルでドープされる、請求項1に記載の化学的感応性センサ。
- 基板上のゲート電極に電気的に連結された、フローティングゲートと、
ドレイン端子接続と、
ソース端子接続と、
該基板上に形成され、1対の電極の一方が該ゲート電極のいずれかの側にある、該1対の電極と、
1対のドープ領域の一方が低濃度ドープ領域および高濃度ドープ領域を含む、該基板内の該1対のドープ領域と、
生体材料を受容するためのマイクロウェルと、
を備え、
該低濃度ドープ領域が、該電極のそれぞれ1つの下に延伸しており、かつ各対の該高濃度ドープ領域が、ドレイン端子およびソース端子にそれぞれ連結されるように延伸しており、かつ、前記マイクロウェルが、前記フローティングゲートに隣接する該ウェルの底に酸化物層を有する、
化学的感応性センサ。 - 前記1対の電極の一方が、基準電極として、および電荷パケットのためのバリアまたはウェルとして機能する、請求項5に記載の化学的感応性センサ。
- 前記1対の電極の一方が、拡散電極として機能し、かつ電荷パケットを促進する、請求項5に記載の化学的感応性センサ。
- ゲート電極に電気的に連結された、フローティングゲートと、
低濃度ドープ領域および高濃度ドープ領域を伴って形成された、ソースと、
低濃度ドープ領域および高濃度ドープ領域を伴って形成された、ドレインと、
生体材料を受容するためのマイクロウェルと、
を備え、
該ソースの該低濃度ドープ領域および該ドレインの該低濃度ドープ領域が、チャネル領域内の該フローティングゲートに隣接して互いに向かって延伸しており、かつ、前記マイクロウェルが、前記フローティングゲートに隣接する該ウェルの底に酸化物層を有する、
化学的感応性センサ。 - 前記ソースおよび前記ドレインの前記高濃度ドープ領域が、該ソースと該ドレインとの前記低濃度ドープ領域よりも大きなドーパント濃度を含む、請求項8に記載の化学的感応性センサ。
- 前記ソースおよび前記ドレインの前記高濃度ドープ領域が、前記チャネル領域および前記ゲート領域から離れて延伸している、請求項8に記載の化学的感応性センサ。
- 前記ソースの前記高濃度ドープ領域が、金属接点に連結される、請求項8に記載の化学的感応性センサ。
- 前記ドレインの前記高濃度ドープ領域が、金属接点に連結される、請求項8に記載の化学的感応性センサ。
- 前記ソースの前記低濃度ドープ領域の容量が、前記ドレインの前記低濃度ドープ領域よりも大きい、請求項8に記載の化学的感応性センサ。
- 前記ソースと前記ドレインとの前記低濃度ドープ領域が、前記化学的感応性センサの利得を制限する静電容量の増大をもたらす、請求項8に記載の化学的感応性センサ。
- 第1の導電型のドーパントで基板を形成するステップと、
該基板を形成するために用いられたものと同じ導電型であるが該基板の該ドーパントよりも濃度を低くしたドーパントを用いて、エピタキシャル層を構築するステップと、
形成された該エピタキシャル層上に、該基板を形成するために用いられた該第1の導電型のドーパントとは異なる第2の導電型のドーパントから電極層を形成するステップであって、該電極層および該基板の双方における該ドーパントの濃度がほぼ同じである、ステップと、
ゲートおよび電極を製作するために該電極層をマスクしてエッチングするステップと、
多方向注入技術(multidirectional implant technique)を用いて、該電極のうちの1つに隣接した第1の低濃度ドープ領域を生成するステップであって、該第1の低濃度ドープ領域が、該エピタキシャル層のドーパントとは反対側の導電型のドーパントから形成される、ステップと、
該ゲート、該電極および該低濃度ドープ領域と同様の導電型のドーパントから、該ゲートに隣接した該電極に自己整列した拡散ノードを生成するステップであって、該拡散ノードの1番目のものが該第1の低濃度ドープ領域に隣接する、ステップと、
絶縁体、誘電体、導電層および金属層が交互に重なった層により、フローティングゲート電極、該拡散領域の上の電極、および電極のための接点を形成するステップと、
前記フローティングゲートの上の試料を保持するためにマイクロウェルを形成するステップであって、該マイクロウェルが、該フローティングゲートに隣接する該ウェルの底に酸化物層を有するステップと、
を含む、化学的感応性センサの作製方法。 - 多方向注入技術を用いて、前記電極のうちの1つに隣接する第2の低濃度ドープ領域を生成するステップ
をさらに含み、
該第2の低濃度ドープ領域が、前記エピタキシャル層のドーパントとは反対側の導電型のドーパントから形成される、
請求項15に記載の方法。 - 前記拡散ノードの2番目のものが、前記第2の低濃度ドープ領域に隣接する、請求項16に記載の方法。
- 拡散領域の上に追加電極を形成するステップ
をさらに含む、請求項15に記載の方法。
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