从结构到性能:DNTT形态学在有机TFT中的关键作用
Mattia Scagliotti1, Antonio Valletta1, Silvia Milita2
1CNR-IMM, Institute for Microelectronics and Microsystems IMM, Rome 00133, Italy.
ACS applied materials & interfaces
|June 18, 2025
概括
使用dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) 的有机薄膜晶体管 (OTFT) 显示出较低的SiO2性能,这是由于分子导向. 这种分子排列增加了缺陷,影响了DNTT膜中的电荷传输.
科学领域:
- 有机电子学有机电子学
- 材料科学是一种材料科学.
- 半导体物理 半导体物理
背景情况:
- 有机薄膜晶体管 (OTFT) 对于灵活的电子产品至关重要.
- OTFT的性能在很大程度上取决于半导体活性层的结构性质.
- 迪纳[2,3-b:2",3"-f][3,2-b] (DNTT) 是一个有前途的有机半导体.
研究的目的:
- 调查基于DNTT的OTFT的电气性能.
- 为了将设备性能与在不同基板 (SiO2和Cytop) 上生长的DNTT薄膜的结构性质相关联.
- 了解分子导向对电荷传输和设备缺陷的影响.
主要方法:
- 电流-电压 (I-V) 的测量.
- 高灵敏度的低频噪声测量.
- 原子力显微镜 (AFM) 用于形态学.
- 用X射线衍射 (XRD) 来进行结构特征.
- 密度功能理论 (DFT) 模拟.密度功能理论 (DFT) 模拟.
- 技术计算机辅助设计 (TCAD) 模拟.
主要成果:
- 与Cytop相比,SiO2上的DNTT膜具有较低的移动性和更高的缺陷密度.
- AFM和XRD揭示了DNTT膜在两个基板上的高度排序的晶体结构.
- DNTT分子主要是垂直于基质的方向,但在SiO2.2上观察到一些平行 (水平) 方向.
- 对SiO2的水平分子方向与降低场效应移动性有关,并将其建模为有缺陷的粒度边界.
结论:
- DNTT片的分子定位显著影响了OTFT的电性能.
- 在SiO2基板上的混合分子方向 (垂直和平行) 会导致缺陷增加和电荷传输效率降低.
- 了解和控制分子排序对于优化基于DNTT的OTFT至关重要.
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