Hot electron spectroscopy: A novel method to study molecular semiconductor

Molecular semiconductors, as the core component, determine the performance of different devices. It is essential to gain more knowledge of such materials. Hot electron spectroscopy, by applying a ballistic electron emission microscope and hot-electron transistor, has been demonstrated to be the most...

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Bibliographic Details
Published in:Organic electronics 2021-07, Vol.94, p.106164, Article 106164
Main Authors: Zhou, Xuehua, Meng, Ke, Geng, Tongmou, Miao, Jiaojiao, Sun, Xiangnan, Zhou, Qiong
Format: Article
Language:English
Subjects:
Ballistic electron emission spectroscopy
Hot electron spectroscopy
Hot electron transistor
Molecular level
Molecular semiconductor
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Summary:Molecular semiconductors, as the core component, determine the performance of different devices. It is essential to gain more knowledge of such materials. Hot electron spectroscopy, by applying a ballistic electron emission microscope and hot-electron transistor, has been demonstrated to be the most powerful method. This review concentrates on the achievements in several emerging fields, such as the interfacial energy level alignment and the charge transport characteristics in molecular film. As a versatile technique, hot electron spectroscopy has been found to be helpful in exploring the metal/molecule interface energy, the molecular levels, the electronic transport gap, and even the group structures. In comparison to the traditional techniques, such as ultraviolet photoemission spectroscopy, inverse photoemission spectroscopy, and scanning tunneling spectroscopy, this method offers in-situ characterizations, which makes the detection much more accurate and convenient. This review contributes to a deep comprehension of the intrinsic characteristics of molecular semiconductors and molecule-based devices. [Display omitted] •Hot electron spectroscopy has recently been employed to determine the intrinsic lowest unoccupied molecular orbital.•Hot electron spectroscopy has been developed to determine the highest occupied molecular orbital.•Hot electron spectroscopy has applied to acquire more informations about molecular levels, such as the LUMO+1 level.•Hot electron spectroscopy provides a powerful approach to achieve a high-efficient spin injection.
ISSN:1566-1199
1878-5530
DOI:10.1016/j.orgel.2021.106164