黑龙江大学许辉团队报道了有机膦夹层碘化铜簇实现电荷捕获。相关研究成果发表在2021年9月21日出版的《德国应用化学》。

实现有机-无机杂化物的差异化功能是构建单分子半导体元件的基础，是一项艰巨的挑战。

该文中，研究人员报道了一种可行的双核团簇分子设计，其特征是双核夹心无机单元的n-p-n异质结，可作为双极晶体管存储器中的有效电荷捕捉器，具有大存储窗口和节能操作。研究人员发现，外围n型有机膦配体提供的空间电子各向异性增强了p型无机单元上的空穴限制。配位位点的空间位阻、碳磷单键的绝缘效应和平行双配体配位模式共同将单元间距离拉长到纳米级，并抑制分子内电子通信，从而实现可调谐、可靠的电荷捕获。

研究结果表明，空间效应对于进一步放大有机和无机单元之间的电子差异以增强功能至关重要。空间效应和电子效应的结合将有助于开发单分子半导体元件。

附：英文原文

Title: Organophosphine-Sandwiched Copper Iodide Cluster Enables Charge Trapping

Author: Hui Xu, Jing Zhang, Mingchen Xie, Ying Xin, Chunmiao Han, Linghai Xie, Mingdong Yi

Issue&Volume: 2021-09-21

Abstract: Realizing the differentiated functions of organic-inorganic hybrids is the basis of constructing single-molecule semiconductor elements as a formidable challenge. Herein, we report a feasible molecular design of the binuclear clusters featuring the n-p-n heterojunction of biligand-sandwiched inorganic units, which can be used as the effective charge trapper in ambipolar transistor memories with the large memory windows and the energy-saving operation.  We find that the hole confinement on the p-type inorganic units is enhanced by spatial electronic anisotropy provided by the peripheral n-type organic phosphine ligands. The steric hindrance of the coordination sites, the insulating effect of the carbon-phosphorous single bonds and the parallel dual-ligand coordination mode jointly elongate the interunit distances to nanometer scale and restrain the intramolecular electronic communications, leading to the tunable and reliable charge trapping.  Our results show that the spatial effect is crucial to further amplifying the electronic differences between organic and inorganic units for function enhancement. The combination of spatial and electronic effects will be useful in developing single-molecule semiconductor elements.

DOI: 10.1002/anie.202111320

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202111320