Single-molecule electronic devices, which use single molecules or single molecular layers as conductive channels, offer a new strategy to solve miniaturization and operation bottlenecks faced by conventional semiconductor electronic devices. These devices have many inherent advantages, including adjustable electronic properties, ease of availability, functional versatility, etc.
To date, single-molecule devices with a variety of functions have been achieved, including diodes, field-effect devices and optoelectronic devices. In addition to their important applications in the field of functional devices, single-molecule devices also provide a unique platform for exploring the intrinsic properties of things in single molecule level.
Regulation of electrical properties of single-molecule devices remains an essential step to advance the development of molecular electronics. To effectively tune the molecular properties of the device, it is necessary to elucidate the interactions between electron transfer in single-molecule devices and external domains, such as external temperature, magnetic fieldAnd the electric fieldAnd the light field. Among these fields, the use of light to tune the electronic properties of single-molecule devices is one of the most important areas known as “single-molecule optoelectronics”.
This interaction not only refers to the effect of light on the electrical properties of molecular devices, that is, the use of light to control charge transfer across molecules, but also refers to the fluorescence arising from molecules during the charge transfer process. Understanding the mechanism of the photoelectric interaction in single-molecule devices is of great importance in the development of single-molecule optoelectronics.
The research groups of Professor Xuefeng Guo, Professor Chuancheng Jia and Professor Dong Xiang from the Center for Single Molecule Science at Nankai University are reviewing the physical mechanism and beyond in single-molecule optoelectronic devices. Single-molecule optoelectronic devices are of great interest because they not only provide novel strategies to solve the bottleneck of miniaturization and employment for conventional semiconductors. electronic devices, but also helps to explore the intrinsic properties of molecules at the single-molecule level. Controlling the electrical properties of single-molecule devices remains the key to further advances in the development of molecular electronics.
It is therefore important to clarify the interaction between charge transfer in devices and external fields, especially light. In this review published in optoelectronic advanceThe photoelectric effects involved in single-molecule devices, including photo-entanglement switching, photoconductivity, plasmon-induced excitation, photovoltaics, and electroluminescence, are summarized. In addition, the mechanisms of single-molecule optoelectronic devices, in particular the processes of photonic crosslinking, photoexcitation, and photo-assisted tunneling, have been developed. Finally, the opportunities and challenges arising from research in single-molecule optoelectronics are briefly presented, and further breakthroughs in this field are proposed. This review will be useful to readers who are engaged in research on optoelectronics, photonics, organic electronics, molecular electronics, etc.
Peihui Li et al, Single-molecule optoelectronic devices: the physical mechanism and beyond, optoelectronic advance (2022). DOI: 10.29026 / oea.2022.210094
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