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在以聚氨酸为基础的多 () 基二维结合聚合物中,具有异常高的电荷流动性

Mingchao Wang¹, Shuai Fu², Petko Petkov³

¹Center for Advancing Electronics Dresden (cfaed) and Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany.

Nature materials

|June 19, 2023

概括

新的梯形类型二维合聚合物 (2DCP) 显示出增强的电荷传输. 这些新型半导体聚合物显示出高流动性,为先进的有机光电学铺平了道路.

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:

二维合聚合物 (2DCPs) 对有机电子有前途,但由于 π-合不佳,它们的电荷移动性往往有限.
现有的2DCPs,就像π-结合的共价有机框架一样,努力实现高电荷载体的移动性.

研究的目的:

通过开发具有增强电荷传输特性的新材料来克服当前2DCPs的局限性.
合成和表征新的基于甲的梯式2DCPs,以提高有机光电子的性能.

主要方法:

在溶热条件下通过八氨基甲酸金属 (Octaaminophthalocyaninato metal) 和纳乙烯四碳酸二化物的多凝聚合成2DCPs.
光学带隙测量和密度函数理论 (DFT) 计算来分析电子结构和有效质量.
太赫兹光谱学用于研究电荷载体运输机制和移动性.

主要成果:

证明了二维半导体基于氨酸的聚胺二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二
观测到的光学带间距约为1.3 eV,具有高度非定位的π电子和小的电子孔,有效质量减少 (约0.15m0).
通过德鲁德类型的自由载体运输实现了电子和孔 (~970 cm2 V−1 s−1) 的异常高总移动性.

结论:

有效的π-结合对于增强2DCP中的电荷传输至关重要.
与现有的线性合聚合物和2DCP相比,开发的2DCP-MPcs显示出优越的电荷传输特性.
这些高流动性的2DCP具有未来有机光电子应用的巨大潜力.

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