一种具有高回旋基态和高内在电导率的n型开合聚合物
Houji Cai1, Haoran Tang1, Tianzuo Wang2
1Institute of Polymer Optoelectronic Materials and Devices, Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, P. R. China.
Angewandte Chemie (International ed. in English)
|April 15, 2024
概括
具有高导电性和自旋状态的新型合聚合物显示出有机电子学的前景. 这些新材料具有出色的内在导电性和热电性质,为先进的电子应用铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 聚合物化学 聚合物化学
背景情况:
- 开联聚合物对于有机电子和自旋电子非常重要,因为它们的导电性和自旋性质.
- 开发具有增强性能的新材料对于推进这些领域至关重要.
研究的目的:
- 为了合成和表征新型的接受器-接受器 (A-A) 结合聚合物,其中包含一个类二二单元.
- 研究这些新型聚合物的电子特性,包括导电性和旋转基态.
- 评估它们作为n型热电材料的潜力.
主要方法:
- 合成了两种新的A-A结合聚合物:DPP-BFDO-Th和DPP-BFDO.
- 聚合物电子性质的表征,包括最低未占用分子轨道 (LUMO) 水平和自旋基态.
- X射线光电子光谱 (XPS) 用于研究自我兴奋剂效应.
- 测量电导率 (σ) 和热电功率系数.
主要成果:
- 聚合物表现出深度对齐的LUMO水平,低于-4.0 eV.
- DPP-BFDO显示出异常低的LUMO (-4.63 eV) 和具有显著激进特征的高旋转地面状态.
- 在DPP-BFDO中通过分子间电荷转移观察到自我兴奋剂.
- DPP-BFDO实现了1.04 S/cm的高内在导电率和12.59 μW/mK2.2的热电功率系数.
- 在n-doping后,电导率提高到65.68 S/cm.
结论:
- 缺乏电子的类单元在制造无剂的n型导电聚合物方面是有效的.
- 开发的聚合物具有高旋转基态和特殊的内在导电性.
- 这些材料在有机电子和自旋电子学中具有重要的应用潜力.
相关概念视频
Types of Semiconductors
589
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...
589
Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
P-N junction
524
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...
524
Spin–Spin Coupling: One-Bond Coupling
958
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
958
Electrical Conductivity
1.1K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
1.1K
Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K


