Impact of Narrowing Density of States in Semiconducting Polymers on Performance of Organic Field‐Effect Transistors
Impact of Narrowing Density of States in Semiconducting Polymers on Performance of Organic Field‐Effect Transistors
复制标题
半导体聚合物中态密度变窄对有机场效应晶体管性能的影响
DOI：
10.1002/smll.202205570
复制
发表时间：
2022
期刊：
影响因子：
13.3
通讯作者：
Tajima Keisuke
中科院分区：
文献类型：
--
作者：
Nakano Kyohei;Kaji Yumiko;Tajima Keisuke
为了提高采用π共轭聚合物的有机场效应晶体管（OFFET）的性能，对材料特性和器件特性之间的关系的基本理解至关重要。虽然态密度（DOS）分布是半导体聚合物的基本材料特性之一，但对DOS形状如何影响OFFEs中的迁移率（μ），亚阈值摆动（S）和接触电阻（RC）的见解仍然缺乏。在这项研究中，通过结合灵敏的DOS测量和多层OFET结构，实验证明，聚合物通道中较窄的DOS宽度导致更高的μ，更小的S和更低的RC。相比之下，体层中的DOS的变化不影响性能。这些结果证明了聚合物性质和OFET性能之间的直接关系，并突出了控制π共轭聚合物中DOS宽度的重要性。
To improve the performance of organic field‐effect transistors (OFETs) employing π‐conjugated polymers, a basic understanding of the relationships between the material properties and device characteristics is crucial. Although the density of states (DOS) distribution is one of the essential material properties of semiconducting polymers, insights into how the DOS shape affects the mobility (µ), subthreshold swing (S), and contact resistance (RC) in OFETs remain lacking. In this study, by combining sensitive DOS measurements and multilayered OFET structures, it is experimentally demonstrated that narrower DOS widths in the polymer channels lead to higherµ, smallerS, and lowerRC. By contrast, variation of the DOS in the bulk layer does not affect the performance. These results demonstrate a direct relationship between the polymer properties and OFET performance and highlight the importance of controlling the DOS width in π‐conjugated polymers.