Li Tianming, Bandari Vineeth Kumar, Hantusch Martin, Xin Jianhui, Kuhrt Robert, Ravishankar Rachappa, Xu Longqian, Zhang Jidong, Knupfer Martin, Zhu Feng, Yan Donghang, Schmidt Oliver G
Material Systems for Nanoelectronics, Chemnitz University of Technology, 09107, Chemnitz, Germany.
Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069, Dresden, Germany.
Nat Commun. 2020 Jul 17;11(1):3592. doi: 10.1038/s41467-020-17352-9.
Considerable efforts have been made to realize nanoscale diodes based on single molecules or molecular ensembles for implementing the concept of molecular electronics. However, so far, functional molecular diodes have only been demonstrated in the very low alternating current frequency regime, which is partially due to their extremely low conductance and the poor degree of device integration. Here, we report about fully integrated rectifiers with microtubular soft-contacts, which are based on a molecularly thin organic heterojunction and are able to convert alternating current with a frequency of up to 10 MHz. The unidirectional current behavior of our devices originates mainly from the intrinsically different surfaces of the bottom planar and top microtubular Au electrodes while the excellent high frequency response benefits from the charge accumulation in the phthalocyanine molecular heterojunction, which not only improves the charge injection but also increases the carrier density.
为了实现基于单分子或分子集合体的纳米级二极管以落实分子电子学的概念，人们已经付出了巨大努力。然而，到目前为止，功能性分子二极管仅在极低的交流频率范围内得到了证明，部分原因是它们的电导率极低以及器件集成度较差。在此，我们报告了基于分子级薄有机异质结且具有微管状软接触的完全集成整流器，其能够转换频率高达10 MHz的交流电。我们器件的单向电流行为主要源于底部平面和顶部微管状金电极本质上不同的表面，而优异的高频响应则得益于酞菁分子异质结中的电荷积累，这不仅改善了电荷注入，还增加了载流子密度。
