Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

被引:29
作者
Liao, LS
Cheng, LF
Fung, MK
Lee, CS
Lee, ST [1 ]
Inbasekaran, M
Woo, EP
Wu, WW
机构
[1] City Univ Hong Kong, COSDAF, Hong Kong, Hong Kong, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
[3] Fudan Univ, Surface Phys Lab, Shanghai 200433, Peoples R China
[4] Dow Chem Co, Corp R&D, Midland, MI 48674 USA
关键词
D O I
10.1016/S0009-2614(00)00722-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level (E-F) of Ca. The original highest occupied molecular orbital of PFO moves away from the E-F, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS Cls core level. (C) 2000 Published by Elsevier Science B.V.
引用
收藏
页码:405 / 410
页数:6
相关论文
共 24 条
  • [1] Direct determination of the exciton binding energy of conjugated polymers using a scanning tunneling microscope
    Alvarado, SF
    Seidler, PF
    Lidzey, DG
    Bradley, DDC
    [J]. PHYSICAL REVIEW LETTERS, 1998, 81 (05) : 1082 - 1085
  • [2] Electroluminescent polymers: Materials, physics and device engineering
    Bradley, D
    [J]. CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, 1996, 1 (06) : 789 - 797
  • [3] CALCIUM ELECTRODES IN POLYMER LEDS
    BROMS, P
    BIRGERSSON, J
    JOHANSSON, N
    LOGDLUND, M
    SALANECK, WR
    [J]. SYNTHETIC METALS, 1995, 74 (02) : 179 - 181
  • [4] LIGHT-EMITTING-DIODES BASED ON CONJUGATED POLYMERS
    BURROUGHES, JH
    BRADLEY, DDC
    BROWN, AR
    MARKS, RN
    MACKAY, K
    FRIEND, RH
    BURN, PL
    HOLMES, AB
    [J]. NATURE, 1990, 347 (6293) : 539 - 541
  • [5] Electroluminescence in conjugated polymers
    Friend, RH
    Gymer, RW
    Holmes, AB
    Burroughes, JH
    Marks, RN
    Taliani, C
    Bradley, DDC
    Dos Santos, DA
    Brédas, JL
    Lögdlund, M
    Salaneck, WR
    [J]. NATURE, 1999, 397 (6715) : 121 - 128
  • [6] FRIEND RH, 1999, PHYSICS WORLD JUN, P35, DOI DOI 10.1088/2058-7058/12/6/27
  • [7] FRIEND RH, 1998, HDB CONDUCTING POLYM, P826
  • [8] INTERFACE FORMATION OF CA WITH POLY(P-PHENYLENE VINYLENE)
    GAO, Y
    PARK, KT
    HSIEH, BR
    [J]. JOURNAL OF APPLIED PHYSICS, 1993, 73 (11) : 7894 - 7899
  • [9] EFFICIENT LIGHT-EMITTING-DIODES BASED ON POLYMERS WITH HIGH ELECTRON-AFFINITIES
    GREENHAM, NC
    MORATTI, SC
    BRADLEY, DDC
    FRIEND, RH
    HOLMES, AB
    [J]. NATURE, 1993, 365 (6447) : 628 - 630
  • [10] High brightness and efficiency blue light-emitting polymer diodes
    Grice, AW
    Bradley, DDC
    Bernius, MT
    Inbasekaran, M
    Wu, WW
    Woo, EP
    [J]. APPLIED PHYSICS LETTERS, 1998, 73 (05) : 629 - 631