JP6208946B2 - ポリマー/電解質の接点でスイッチングするコンダクタンスに基づくメモリデバイス - Google Patents
ポリマー/電解質の接点でスイッチングするコンダクタンスに基づくメモリデバイス Download PDFInfo
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- JP6208946B2 JP6208946B2 JP2013002334A JP2013002334A JP6208946B2 JP 6208946 B2 JP6208946 B2 JP 6208946B2 JP 2013002334 A JP2013002334 A JP 2013002334A JP 2013002334 A JP2013002334 A JP 2013002334A JP 6208946 B2 JP6208946 B2 JP 6208946B2
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Classifications
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- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0009—RRAM elements whose operation depends upon chemical change
- G11C13/0014—RRAM elements whose operation depends upon chemical change comprising cells based on organic memory material
- G11C13/0016—RRAM elements whose operation depends upon chemical change comprising cells based on organic memory material comprising polymers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/004—Reading or sensing circuits or methods
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/0002—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using resistive RAM [RRAM] elements
- G11C13/0021—Auxiliary circuits
- G11C13/0069—Writing or programming circuits or methods
-
- H—ELECTRICITY
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Description
ポリマーとしてポリ(3−ヘキシルチオフェン)の場合について、図1に示される構造をメモリデバイスとして操作することを図2および図3に示す。40秒間の「活性化」期間の後、ポリマー層のコンダクタンスを、高コンダクタンス状態と低コンダクタンス状態との間で繰り返しスイッチングした。図2は、ポリ 3−ヘキシルチオフェンをポリマー層として含む図1の構造を用いたメモリデバイスの操作を示し、R1とR2の間の電流に対し、連続的な「活性化」パルスが及ぼす影響を示す。図3は、約40回の書き込み/消去サイクルを示し、R1とR2の電流を繰り返しスイッチングする(バイアス0.1Vで測定)ことを示している。
ポリチオフェン半導体のポラロン形成を監視するために、2個の端子の接点を作成した。3個の端子のデバイスと同様に、周囲のH2Oで飽和した電子線酸化ケイ素を電解質層として使用した。酸化ケイ素層の多孔性を確認するために、このデバイスの電流密度を測定した。図5のように、2つの電極間で大きな漏れ電流が存在し、このことは、酸化ケイ素層の多孔性の特徴またはピンホールを示している。
実施例1と同様に、半導体ポリマーとしてポリ(クアテルチオフェン)(PQT)を使用し、PEOに分散したビオロゲンLiClO4を電解質層として用い、図1に示される構造を有するメモリデバイスを作成した。PQT/ビオロゲンデバイスは、減圧下で実行可能なままであり、使用可能なオン/オフ比に達するのに活性化パルスは必要ではない。重要なことに、このデバイスは、「オン」電流および「オフ」電流の優れた安定性を示し、103〜104の顕著なオン/オフ比を示す。デバイスは、破壊を起こさず、また、ソース−ドレイン電流に顕著に流れることなく、100サイクルを受けた。ラマン顕微鏡を用い、PQT/ビオロゲンメモリデバイスをさらに試験した。ポラロンを作成し、高インダクタンス状態を補正するという以前の観察結果を確認することに加え、本願発明者らは、ここで、還元したビオロゲン種の同時出現を観察することができ、したがって、このことは、本開示のメモリデバイスの酸化還元モデルを支持する。
Claims (8)
- 基材の上に提供されており、互いに隔離されている少なくとも第1の電極および第2の電極と、
前記第1の電極と前記第2の電極を電気的に接続している有機半導体ポリマーと、
前記有機半導体ポリマーと接する電解質層と、
前記第1の電極、前記第2の電極、前記有機半導体ポリマーと接していない、前記電解質層上の第3の電極と、
前記電解質層の上または下の、相補的な酸化還元剤を含む1つ以上の層とを備え、
前記有機半導体ポリマーが、第1の導電性を示す第1の酸化還元状態と、第2の導電性を示す第2の酸化還元状態を示し、
前記有機半導体ポリマーは、下記式のポリチオフェンである、不揮発性メモリデバイス。
- 前記基材が可とう性である、請求項1に記載の不揮発性メモリデバイス。
- 前記第2の導電性が、室温で0.1S/cm未満であり、前記第1の導電性が、第2の導電性よりも少なくとも10倍高い、請求項1に記載の不揮発性メモリデバイス。
- 前記第2の導電性に対する前記第1の導電性の比率が10〜1010の範囲である、請求項1に記載の不揮発性メモリデバイス。
- 前記電解質層が移動イオンを含む、請求項1に記載の不揮発性メモリデバイス。
- 前記第1の電極と前記第2の電極が、互いに実質的に平行に作られる、請求項1に記載の不揮発性メモリデバイス。
- 前記電解質層が固体電解質である、請求項1に記載の不揮発性メモリデバイス。
- 前記有機半導体ポリマーの第1の酸化還元状態が、酸化/還元反応を経て前記有機半導体ポリマーの第2の酸化還元状態にスイッチングする、請求項1に記載の不揮発性メモリデバイス。
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