Cocrystal engineering of molecular rearrangement: a "turn-on" approach for high-performance N-type organic semiconductors
Cocrystal engineering of molecular rearrangement: a "turn-on" approach for high-performance N-type organic semiconductors
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分子重排共晶工程：高性能N型有机半导体的“开启”方法
DOI：
10.1039/d1tc01441b
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发表时间：
2021
影响因子：
6.4
通讯作者：
Huang Wei
中科院分区：
文献类型：
--
作者：
Wang Wei;Luo Lixing;Lin Zongqiong;Mu Zifeng;Ju Zhengkun;Yang Bo;Li Yang;Lin Menglu;Long Guankui;Zhang Jing;Zhao Jianfeng;Huang Wei
开发新型高性能n型半导体材料对未来有机电子学具有重要意义。新的缺电子骨架的复杂合成过程或通过化学修饰来控制其能级和电子传输途径限制了它们的应用。在这里，使用PAH供体掺杂，我们报告说，两种多晶型TCAF为基础的复合物作为有效的n型半导体源自非活性的原始材料。这些超分子结构在相同的1：1摩尔比下沿混合π-π堆积方向具有不同的给体-受体重叠沿着。 在可控的溶剂处理条件下，基片上的微晶可以发生完全的相变。结果，由于相变，观察到电子迁移率从0.06到0.88 cm 2 V-1 s-1的大偏移。量子计算证实，包含更好的重叠的多晶型结构允许更大的转移积分比扭曲重叠。二元超分子体系的电荷输运性质与分子取向高度相关。这种共晶工程相控制方法为我们探索高性能n型有机半导体提供了新的思路。
Developing novel high-performance n-type semiconductors is of great importance for future organic electronics. Complicated synthesizing procedures of new electron deficient backbones or chemical modification to control the energy level and electron transport route limit their applications. Here, using PAH donor doping, we report that two polymorphs of TCAF based complexes act as efficient n-type semiconductors originating from inactive pristine material. These supramolecular structures possessed different donor–acceptor overlaps along the mixed π–π stacking direction with the same molar ratio of 1 : 1. Also the complete phase transition of the microcrystals on the substrate could happen under controllable solvent treatment. As a result, a large shift of electron mobility from 0.06 to 0.88 cm2 V−1 s−1 was observed, due to the phase change. Quantum calculations confirmed that the polymorphic structure containing better overlaps allowed larger transfer integrals than that with distorted overlaps. The charge transport properties of the binary supramolecular system are highly correlated with the molecular orientations. This cocrystal engineering approach of phase control provides us new insight towards high performance n-type organic semiconductor exploration.