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1. 中南大学 先进材料超微结构与超快过程研究所,湖南 长沙,410083
2. Department of Physics and Astronomy, University of Rochester,, 27 Rochester,USA,NY146
纸质出版日期:2015-8-3,
收稿日期:2015-4-29,
修回日期:2015-6-9,
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吕路, 牛冬梅, 谢海鹏等. 2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩(C8-BTBT)与MoS<sub>2</sub>界面的能级匹配与薄膜生长[J]. 发光学报, 2015,36(8): 875-881
LYU Lu, NIU Dong-mei, XIE Hai-peng etc. Energy Level Bending and Molecular Packing Mode of 2,7-diocty[1]benzothieno[3,2-b] benzothiophene(C8-BTBT) on MoS<sub>2</sub>[J]. Chinese Journal of Luminescence, 2015,36(8): 875-881
吕路, 牛冬梅, 谢海鹏等. 2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩(C8-BTBT)与MoS<sub>2</sub>界面的能级匹配与薄膜生长[J]. 发光学报, 2015,36(8): 875-881 DOI: 10.3788/fgxb20153608.0875.
LYU Lu, NIU Dong-mei, XIE Hai-peng etc. Energy Level Bending and Molecular Packing Mode of 2,7-diocty[1]benzothieno[3,2-b] benzothiophene(C8-BTBT) on MoS<sub>2</sub>[J]. Chinese Journal of Luminescence, 2015,36(8): 875-881 DOI: 10.3788/fgxb20153608.0875.
结合紫外光电子能谱(UPS)、X射线光电子能谱(XPS)和原子力显微镜(AFM)等实验手段系统研究了C8-BTBT沉积在层状MoS
2
基底上的界面能级匹配、薄膜生长和分子取向.研究发现C8-BTBT分子竖直生长在MoS
2
上
生长过程中界面的真空能级(VL)、最高占据态轨道(HOMO)和电离能(IP)都出现了非常规的弯曲现象.这种能级弯曲行为可归因于直立分子从界面相到体相的转变过程中
其分子倾斜角(
)存在一定的渐变
这种渐变会在沿表面法线方向诱导出一系列的层间电偶极
最终导致能级的弯曲.同时
的变化也会改变薄膜的表面极化强度
引起IP的逐渐减小.能级的弯曲在界面处形成类P-N结的效应会对C8-BTBT基电子器件的性能有很大的影响.
The energy level alignment
film growth and molecular orientation of C8-BTBT on MoS
2
were studied by ultraviolet photoemission spectroscopy (UPS)
X-ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM). The molecules adopt standing-up orientation on MoS
2
and the island growth mood were confirmed. The ionization potential (IP) decrease and highest occupied orbital (HOMO) down-shift were observed as the film thickness increased. IP decrease is ascribed to the gradual increase of the surface electric dipole pointing inwards when the molecular tilt angle (
) about the substrate normal decreases with the increasing of film thickness. The energy level shift results in an analogy P-N junction effect
which provides important guidance for C8-BTBT based electronic device design.
光电子能谱C8-BTBT能级匹配分子取向薄膜生长
photoemission spectroscopy (PES)C8-BTBTenergy level alignmentmolecular orientationfilm growth
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