Optical Gating Electron Transport through Nonphotoresponisive Molecular Junctions
Optical Gating Electron Transport through Nonphotoresponisive Molecular Junctions
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DOI：
10.21203/rs.3.rs-75718/v1
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Zhikai Zhao;C. Guo;Feng Sun;T. Ning;Zong-Liang Li;Bingqian Xu;Xueyan Zhao;Lifa Ni;Qingling Wa
中科院分区：
文献类型：
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作者：
Zhikai Zhao;C. Guo;Feng Sun;T. Ning;Zong-Liang Li;Bingqian Xu;Xueyan Zhao;Lifa Ni;Qingling Wa
通过光照操纵单分子结的电子传递是迈向分子杂化器件的关键一步。然而，在特定的光照下，大多数类型的分子没有光响应，没有光吸收。在这里，通过引入纳米间隙等离子体和分子设计，提供了一种通过具有一般光源的非光响应分子结的高效门控电子传输的策略。研究发现，具有埋藏锚定基团的三苯胺类非光响应分子在一般光照下电导率可提高2个数量级，在非光响应分子家族中电导率提高最大。进一步揭示了巨电导调制源于埋地锚定基团与等离子体激发热电子的耦合作用。这项工作将有助于理解光与桥接分子之间的相互作用机制，有助于基于分子的混合光电器件的发展。
The manipulation of electron transport through single-molecule junctions via light illumination is a critical step towards molecular hybrid devices. However, most kinds of molecules are nonphotoresponsive without photo absorption upon a specific light illumination. Here, a strategy for high efficiently gating electron transport through a nonphotoresponsive molecular junction with a general light source is provided by introducing nanogap plasmons and molecular design. It is found the conductance of the triphenylamine-based molecules, a nonphotoresponsive molecule with buried anchoring groups, can be enhanced by two orders of magnitude under a general light illumination, which should be the greatest enhancement in the family of nonphotoresponsive molecules. It is further revealed that the giant conductance modulation originates from the coupling of the buried anchoring groups and plasmon-excited hot electrons. This work would contribute to the understanding of the interaction mechanisms between light and bridged molecules, assisting the development of the molecule-based hybrid optoelectronic devices.