Surface Segregated Monolayers of Fluoroalkylated Rod-like Molecule for Asymmetric Charge Transport at Organic Semiconductor Interfaces

被引:1
作者
Yokoyama, Takaho [1 ]
Tajima, Keisuke [1 ]
机构
[1] RIKEN Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan
基金
日本学术振兴会;
关键词
surface modification; organic semiconductors; polymer thin films; surface segregated monolayer; molecular dipole layer; energy level alignment; SELF-ASSEMBLED MONOLAYERS; THIN-FILMS; DONOR/ACCEPTOR INTERFACE; LIQUID-CRYSTALS; POLYMERS; ORIENTATION;
D O I
10.1021/acsaelm.4c00602
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A rod-like molecule composed of biphenyl and a fluoroalkyl chain was synthesized, and its surface segregation behavior was investigated. This molecule spontaneously organized into a dense two-dimensional monolayer, termed surface segregated monolayer (SSM), on the surface of poly(3-hexylthiophene) (P3HT) film during spin-coating. The formation of SSM with high density and specific molecular orientation was confirmed by X-ray photoelectron spectroscopy, water contact angle measurement, and atomic force microscopy. The orientation of the molecular dipole moments within the SSM significantly increased the ionization potential, which was attributed to a vacuum level shift at the surface, as detected by ultraviolet photoelectron spectroscopy. The introduction of the SSM at the interface of organic semiconductor films led to an interfacial vacuum level shift, which could cause asymmetric current-voltage characteristics in the vertical hole conduction that varied with the direction of the interfacial dipole moments.
引用
收藏
页码:4570 / 4577
页数:8
相关论文
共 40 条
  • [1] Effect of molecular weight on the structure and morphology of oriented thin films of regioregular poly(3-hexylthiophene) grown by directional epitaxial solidification
    Brinkmann, Martin
    Rannou, Patrice
    [J]. ADVANCED FUNCTIONAL MATERIALS, 2007, 17 (01) : 101 - 108
  • [2] Charge Photogeneration in Organic Solar Cells
    Clarke, Tracey M.
    Durrant, James R.
    [J]. CHEMICAL REVIEWS, 2010, 110 (11) : 6736 - 6767
  • [3] Models of charge pair generation in organic solar cells
    Few, Sheridan
    Frost, Jarvist M.
    Nelson, Jenny
    [J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2015, 17 (04) : 2311 - 2325
  • [4] IMAGING OF LIQUID-CRYSTALS USING A TUNNELLING MICROSCOPE
    FOSTER, JS
    FROMMER, JE
    [J]. NATURE, 1988, 333 (6173) : 542 - 545
  • [5] Frisch M. J., 2009, GAUSSIAN 09 REVISION
  • [6] Dipole Layer Formation by Surface Segregation of Regioregular Poly(3-alkylthiophene) with Alternating Alkyl/Semifluoroalkyl Side Chains
    Geng, Yanfang
    Wei, Qingshuo
    Hashimoto, Kazuhito
    Tajima, Keisuke
    [J]. CHEMISTRY OF MATERIALS, 2011, 23 (18) : 4257 - 4263
  • [7] SURFACE-STRUCTURE AND OXYGEN PERMEATION IN MIXED MULTIBILAYER FILMS OF HYDROCARBON AND FLUOROCARBON AMPHIPHILES
    HIGASHI, N
    KUNITAKE, T
    KAJIYAMA, T
    [J]. MACROMOLECULES, 1986, 19 (05) : 1362 - 1366
  • [8] Self-assembled monolayers for interface engineering in polymer solar cells
    Hu, Jie
    Fu, Weifei
    Yang, Xi
    Chen, Hongzheng
    [J]. JOURNAL OF POLYMER SCIENCE, 2022, 60 (15) : 2175 - 2190
  • [9] Ishii H, 1999, ADV MATER, V11, P605, DOI 10.1002/(SICI)1521-4095(199906)11:8<605::AID-ADMA605>3.0.CO
  • [10] 2-Q