Effective mass and inner potential of hot electrons in organic thin films.

有机薄膜中热电子的有效质量和内势。

• 批准号: 02805003
• 负责人: UENO Nobuo
• 金额: $ 1.09万
• 依托单位: Chiba University, Faculty of Engineering
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02805003/
• 关键词: organic thin film; electron transmission; electron scattering; hot electron; band structure; effective mass; conduction band; electron transport; 低速電子透過; 有機半導体; 超薄膜; 配向分子薄膜; 電子状態

Low-energy-electron transmission (LEET) spectra were measured for thin films of copper phthalocyanine (CuPc) with different crystalline order using electron energies below 15 eV. The LEET features were highly dependent on the crystalline order, indicating that they do not originate from the electronic states localized in the individual molecules, but from those which reflect the crystal structure. For oriented polycrystalline films of alpha-form CuPc with the crystal bc plane parallel to the surface, the energy positions of the LEET minima were found to be in excellent agreement with those of the band gaps obtained by assuming a parabolic conduction band in the direction perpendicular to the crystal bc plane. Further we estimated the effective mass of hot electron m^* to be 2.2_2m_0, where m_0 is the free-electron mass, and the inner potential v_0 to be -1.3_3 eV in the direction perpendicular to the bc plane of alpha-form CuPc. The results show that the specular reflection of the incident electron at the band gap is a main factor for the LEET features and the hot-electron states can be well described by the parabolic dispersion even near the vacuum level.

利用低能电子透射（LEET）谱测量了不同晶序的酞菁铜（CuPc）薄膜的低能电子透射（LEET）谱。的LEET功能高度依赖于晶体的顺序，表明它们不起源于本地化在单个分子的电子状态，但从那些反映晶体结构。对于取向的多晶薄膜的α-形式的酞菁铜与晶体BC平面平行的表面，LEET极小的能量位置被发现是在良好的协议与通过假设在垂直于晶体BC平面的方向上的抛物线导带获得的带隙。此外，我们还估算了热电子的有效质量m^* 为2.2_2m_0，其中m_0为自由电子质量，在垂直于α-型CuPc的bc平面的方向上，内电势v_0为-1.3_3eV。结果表明，入射电子在带隙处的镜面反射是影响LEET特性的主要因素，即使在真空能级附近，热电子态也可以用抛物线色散很好地描述。

项目成果

N. Ueno: "Angle-resolved photoemission from Langmuir-Blodgett films of copper tetrakis (n-butoxy-carbonyl) phthalocyanine with synchrotron radiation" Thin Solid Films. 207. (1992)

N. Ueno：“使用同步辐射从四（正丁氧基-羰基）铜酞菁铜的 Langmuir-Blodgett 薄膜进行角分辨光电子发射”固体薄膜。

N. Ueno: "Nature of the temperature dependence of conduction bands in polyethylene" Phys. Rev.B43-3. 2384-2390 (1991)

N. Ueno：“聚乙烯导带温度依赖性的性质”Phys。

N.Ueno: "Hotーelectron transmission through thin amorphous films of tetratetracontane:Effects of the density of gap states on the bandーgap current and its anomalous temperature dependence" Phys.Rev.B. 42. 1659-1662 (1990)

N.Ueno：“通过四十四烷非晶薄膜的热电子传输：带隙态密度对带隙电流及其异常温度依赖性的影响”Phys.Rev.B. 42. 1659-1662 (1990)

N. Ueno: "Hot-electron transmission through thin amorphous thin films of tetratetracontane : Effects of the density of gap states on the band-gap current and its anomalous temperature dependence" Phys. Rev.B42-3. 1659-1662 (1990)

N. Ueno：“通过四十四烷非晶薄膜的热电子传输：带隙态密度对带隙电流及其反常温度依赖性的影响”Phys。

N.Ueno and K.Sugita: "Hot electron transmission through thin amorphous films of tetratetracontane:Effects of the density of gap states on the bandーgap current and its anomalous temperature dependence." Phys.Rev.B. 42. 1659-1662 (1990)

N.Ueno 和 K.Sugita：“通过四十四烷非晶薄膜的热电子传输：间隙态密度对带隙电流及其反常温度依赖性的影响。” Phys.Rev.B. 42. 1659-1662 ）