リモート・フィールド・エフェクト・トランジスタを用いたポリマーにおけるドーパント溶液濃度,電荷载体密度,および物理的拡散を特徴付ける分析プラットフォーム
Hyun-June Jang1, Justine Wagner1, Hui Li1
1Department of Materials Science and Engineering , Johns Hopkins University , 3400 N. Charles Street , Baltimore , Maryland 21218 , United States.
Journal of the American Chemical Society
|March 1, 2019
まとめ
新しいリモートゲートフィールド効果トランジスタ (RG FET) システムは,導電性ポリマーにおけるドーピングと,受動性ポリマーにおける拡散を特徴づけている. RG FETは電位の変化を検出し,表面での電子ドナー-受容体相互作用の洞察を明らかにします.
科学分野:
- 材料科学
- オーガニック電子
- 表面科学
背景:
- 伝導性ポリマーと受動性ポリマーが 電子機器に不可欠です
- ポリマーの性能を最適化するには,ドーピング効果と分子拡散を理解することが重要です.
- 既存の特徴付け方法は,範囲が制限されているか,特定の条件を必要とします.
研究 の 目的:
- 導電性ポリマーのドーピングを特徴付けるためのリモートゲートフィールド効果トランジスタ (RG FET) システムの開発と利用.
- パッシブポリマーマトリックス内の小さな分子の物理的拡散を調査する.
- 材料の表面での電子ドナー-受容体の相互作用を非破壊的に分析する.
主な方法:
- リモートゲートフィールド効果トランジスタ (RG FET) 検出システムの製造
- F4TCNQでドーピングした後のポリマーフィルム (例えば,P3HT) の電気的潜在的な混乱の測定.
- ポリマーの伝導性と移動性の変化を定量化するためにVthシフトモデルを適用する.
- 小分子拡散 (例えば,F4TCNQ) をFET分析でモニタリングする.
主要な成果:
- F4TCNQで誘導された陽性ポテンシャルと,FETの値電圧 (Vth) を低下させたドーピングポリ (P3-ヘキシルチオフェン) (P3HT).
- 異なる電子ドナー (P3HT,ITO,ゴールド) において,ドーパント結合のための限られた電気活性部位を示唆する類似の電気的潜在的な乱れが観察されました.
- RG FETシステムは,濃度グラデーションによって誘発されるポリステリン中のF4TCNQ拡散を成功裏にモニタリングした.
- Vthシフトの差異は,様々な電子受容体で,そのサイズと還元ポテンシャルに起因していることが観察されました.
結論:
- RG FETシステムは,ポリマーのドーピングと拡散を特徴づけるための汎用的なツールを提供します.
- 表面相互作用とドーパント濃度は,伝導性ポリマーの電気特性に大きな影響を及ぼします.
- この技術は,ポリマーの表面相互作用と分子輸送の非破壊的な環境分析を可能にします.
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