Precise analysis of extended electronic structure in organic thin films by in situ normal and inverse photoemission spectroscopies

通过原位正向和逆向光电发射光谱精确分析有机薄膜中的扩展电子结构

• 批准号: 11304049
• 负责人: SATO Naoki
• 金额: $ 23.47万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11304049/
• 关键词: Organic thin film; Electronic structure; Valence state; Unoccupied state; Ultraviolet photoemission spectroscopy; Inverse photoemission spectroscopy; In situ measurement; Measurement precision; 分解能; 高分解能化

This research is aiming at constructing a measurement system which enables us to observe in situ extended electronic structure of the states below and above the energy gap in the same specimen of an organic thin film by means of ultraviolet photoemission spectroscopy (UPS) and inverse photoemission spectroscopy (IPES) with comparable measurement precisions. Such a research was motivated by the importance of grasping the extended electronic structure in thin films of organic semiconductors in particular as directly as possible, since those films attract increasing interests as key materials toward molecular electronic devices.This research has been started on the basis of our previous studies on the electronic structures in organic thin films using our home-built apparatuses, such as a UPS one for the measurement of valence electronic states and an IPES one in the BIS mode for the measurement of low-energy unoccupied states. Then, we have conceived an idea of combination of the two kinds of photoemission spectroscopies with even better performance and have designed a new apparatus also furnished with instruments for preparation and characterization of a sample specimen films. Simultaneously, we have collected various experimental data concerning organic thin films to make good use of them for determining detailed physical parameters and specifications for the new apparatus ; especially, IPES measurements of thin films of several organic materials were carried out to know the critical situation of this method, as only a few IPES studies on organic thin films have been reported so far.Thus, we have investigated the practical conditions needed for our new apparatus which permits in situ observation of both valence and unoccupied electronic states in a particular thin film as precisely as possible.As a result, we have almost constructed such an apparatus with a few points in question open to further discussion.

本研究旨在构建一个测量系统，使我们能够通过紫外光电子能谱（UPS）和反相光电子能谱（IPES）以可比的测量精度原位观察同一有机薄膜样品中能隙下方和上方能级的扩展电子结构。这项研究的动机是尽可能直接地掌握有机半导体薄膜中扩展的电子结构，因为这些薄膜作为分子电子器件的关键材料引起了越来越多的兴趣。这项研究是在我们之前使用我们自制的设备对有机薄膜中的电子结构进行研究的基础上开始的，例如用于测量价电子态的 UPS 和用于测量价电子态的 IPES 设备。 用于测量低能未占据态的 BIS 模式。然后，我们想到了将两种光电子能谱结合起来的想法，具有更好的性能，并设计了一种新设备，还配备了用于制备和表征样品薄膜的仪器。同时，我们收集了有关有机薄膜的各种实验数据，以便充分利用它们来确定新装置的详细物理参数和规格；特别是，对几种有机材料的薄膜进行了 IPES 测量，以了解该方法的关键情况，因为迄今为止只有少数有机薄膜的 IPES 研究被报道。因此，我们研究了我们的新装置所需的实际条件，该装置允许尽可能精确地原位观察特定薄膜中的价态和未占据电子态。因此，我们几乎已经构建了这样一个具有以下几点的装置： 问题有待进一步讨论。

项目成果

G.J.Ashwell, et al.: "Monolayer films of U-shaped molecules : suppression of the aggregation-induced second-harmonic generation of squaraine dyes by guest-host interactions"J.Mater.Chem.. 10. 2473-2476 (2000)

G.J.Ashwell 等人：“U 形分子的单层膜：通过客体-主体相互作用抑制方酸菁染料聚集诱导的二次谐波产生”J.Mater.Chem.. 10. 2473-2476 (2000)

M.Mitsuya, N.Sato: "Energy shift for core electron levels of chemisorbed molecules observed by X-ray photoelectron spectroscopy in the course of monolayer growth on a Si(111) surface"Langmuir. 15. 2099-2102 (1999)

M.Mitsuya, N.Sato：“在 Si(111) 表面单层生长过程中，通过 X 射线光电子能谱观察到化学吸附分子核心电子能级的能量转移”Langmuir。

K.Yoshida, et al.: "Dependence of optical absorption spectra on structures of bis(1,2-benzoquinonedioximato)Pt(II) thin films"Mol. Cryst. Liq. Cryst.. 342. 121-126 (2000)

K.Yoshida 等人：“光学吸收光谱对双(1,2-苯醌二肟基)Pt(II) 薄膜结构的依赖性”Mol。

N.Sato, et al.: "Molecular orbital calculations of nonlinear optical parameters for test molecules of a highly amphoteric and polar molecule(HAPM)"Mol. Cryst. Liq. Cryst.. 355. 319-329 (2001)

N.Sato 等人：“高两性极性分子 (HAPM) 测试分子的非线性光学参数的分子轨道计算”Mol。

H.Yoshida, et al.: "Unoccupied electronic states of 3d-transition metal phthalocyanines (MPc : M = Mn, Fe, Co, Ni, Cu and Zn) studied by inverse photoemission spectroscopy"J. Elect. Spectrosc. Relat. Phenom.. 121. 83-91 (2001)

H.Yoshida 等人：“通过反光电子能谱研究 3d 过渡金属酞菁的未占据电子态（MPc：M = Mn、Fe、Co、Ni、Cu 和 Zn）”J.