PDIF-CN2単結晶トランジスタの真空および環境における高い電子移動性
Anna S Molinari1, Helena Alves, Zhihua Chen
1Kavli Institue of Nanoscience, Delft University, Lorentzweg 1, 2628CJ, Delft, The Netherlands. A.S.Molinari@tudelft.nl
Journal of the American Chemical Society
|February 5, 2009
まとめ
この研究では,PDIF-CN ((2) 有機半導体を使用して単結晶フィールド効果トランジスタを製造しました. この装置は,真空と空気の両方で高い電子移動性を実証し,電子アプリケーションに適しています.
科学分野:
- オーガニック・エレクトロニクス
- マテリアルサイエンス 材料科学
- 半導体デバイス物理学の物理
背景:
- オーガニック半導体は,柔軟で低コストの電子機器の可能性を秘めています.
- ペリレンビシミドは,調節可能な電子特性を持つ有機半導体の一種です.
- 高性能オーガニックフィールドエフェクトトランジスタ (OFET) は,高電荷キャリアの移動性と安定性を要求します.
研究 の 目的:
- フローロ炭素で置換されたディシアノペリレン-3,4:9,10-ビス ((dicarboximide) [PDIF-CN ((2)) ]半導体を使用して,単結晶フィールド効果トランジスタ (FET) を製造および特徴づけること.
- これらのFETの性能を異なる環境条件 (真空と空気) で評価する.
主な方法:
- FETの製造は,PDIF-CN(2) 単結晶をSi-SiO(2) /PMMA-Au基板にラミネートすることによって行われます.
- 製造されたデバイスの電気的特徴は,真空環境と環境空気の条件の両方で作られています.
主要な成果:
- 電子の移動性が高く,真空では約6~3cm2~V~1s~1cm,空気では約3~1cm2~V~1s~1cmに達した.
- 高いオン/オフ電流比 (オン:オフ) が10を超えていることが実証されています.
- デバイスの効率的な動作を示す,ゼロに近い値電圧を観測しました.
結論:
- 単結晶PDIF-CN(2) FETは,有機電子アプリケーションの有望な性能特性を示しています.
- 装置は空気中での良好な動作安定性を示し,実用的な使用の可能性を示唆しています.
- 高い電子移動性と低い値電圧は,高性能OFETにおける酸化ペリレンダイミドの潜在能力を強調しています.
さらに関連する動画
関連する概念動画
01:11P-N junction
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
01:12Fermi Level Dynamics
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
01:20Types of Semiconductors
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
01:21Carrier Transport
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by: