Role of Perfluorophenyl Group in the Side Chain of Small-Molecule n-Type Organic Semiconductors in Stress Stability of Single-Crystal Transistors
Role of Perfluorophenyl Group in the Side Chain of Small-Molecule n-Type Organic Semiconductors in Stress Stability of Single-Crystal Transistors
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小分子n型有机半导体侧链全氟苯基对单晶晶体管应力稳定性的作用
DOI：
10.1021/acs.jpclett.0c03012
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
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作者：
Kumagai;S.; Yu;C. P.; Nakano;S.; Annaka;T.; Mitani;M.; Yano;M.; Ishii;H.; Takeya;J.; Okamoto;T.
操作稳定性，例如长期环境耐久性和偏置应力稳定性，是有机薄膜晶体管（OTFT）中最重要的参数之一。这种稳定性的理解主要致力于前线轨道的能级，薄膜形态，器件配置涉及栅极和电极，而分子和聚集的结构特征在器件稳定性中的作用很少讨论。在这封信中，我们报告了一个显着的增强的操作稳定性，特别是偏置应力，n沟道单晶OTFT的侧链中的全氟苯基取代苯基。由于用于OTFT的几个分子厚的单晶性质，晶体表面性质被认为是至关重要的，其中由全氟苯基部分组成的表面结构可以抑制环境物质和场诱导载流子之间的相互作用，这是由于π共轭单元的疏水性和空间保护增加。
Operational stability, such as long-term ambient durability and bias stress stability, is one of the most significant parameters in organic thin-film transistors (OTFTs). The understanding of such stabilities has been mainly devoted to energy levels of frontier orbitals, thin-film morphologies, and device configuration involving gate dielectrics and electrodes, whereas the roles of molecular and aggregated structural features in device stability are seldom discussed. In this Letter, we report a remarkable enhancement of operational stability, especially bias stress, of n-channel single-crystal OTFTs derived from a replacement of phenyl with perfluorophenyl groups in the side chain. Because of the several-molecule-thick single-crystal nature employed for the OTFTs, the crystal-surface properties are thought to be critical, where the surface structure composed of perfluorophenyl moieties could suppress interactions between environmental species and field-induced carriers owing to increased hydrophobicity and steric protection of π-conjugated units.