Organic Mip-diodes by p-doping of amorphous wide-gap semiconductors:: CV and impedance spectroscopy

被引:71
作者
Drechsel, J [1 ]
Pfeiffer, M [1 ]
Zhou, X [1 ]
Nollau, A [1 ]
Leo, K [1 ]
机构
[1] Tech Univ Dresden, Inst Angew Photophys, D-01062 Dresden, Germany
关键词
m-MTDATA; starburst; doping; amorphous; CV; impedance spectroscopy;
D O I
10.1016/S0379-6779(01)00623-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Organic thin film materials are widely investigated for applications in electronic and optoelectronic devices. For OLEDs with low operation voltage, controlled doping of the charge transport layers is particularly important. We have recently shown that starburst like amorphous materials (m-MTDATA) can be doped by strong molecular acceptors like F-4-TCNQ (tetrafluoro-tetracyano-quinodimethane). These amorphous materials have the advantage of being stable up to 100 degreesC and forming smooth surfaces. Very well blocking Mip-type Schottky structures (rectification ratio 10(4)-10(5)) allow to determine doping profiles using CV (capacitance-voltage) spectroscopy. The interface between the doped and the undoped layer can be clearly seen as an abrupt change of the capacitance. The impedance spectra can be understood in terms of an equivalent circuit model. The deduced parameters agree well with the nominal thicknesses of the i- and the p-layer and the independently measured bulk conductivity. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:201 / 205
页数:5
相关论文
共 23 条
  • [1] [Anonymous], 1999, ADV SOLID STATE PHYS
  • [2] Low voltage organic light emitting diodes featuring doped phthalocyanine as hole transport material
    Blochwitz, J
    Pfeiffer, M
    Fritz, T
    Leo, K
    [J]. APPLIED PHYSICS LETTERS, 1998, 73 (06) : 729 - 731
  • [3] THERMALLY STIMULATED CURRENTS IN UNDOPED AND DOPED ZINC PHTHALOCYANINE FILMS
    BOUDJEMA, B
    ELKHATIB, N
    GAMOUDI, M
    GUILLAUD, G
    MAITROT, M
    [J]. REVUE DE PHYSIQUE APPLIQUEE, 1988, 23 (06): : 1127 - 1134
  • [4] THEORETICAL AND EXPERIMENTAL DOPING OF MOLECULAR MATERIALS - PARA-DOPING AND NORMAL-DOPING OF ZINC PHTHALOCYANINE
    ELKHATIB, N
    BOUDJEMA, B
    GUILLAUD, G
    MAITROT, M
    CHERMETTE, H
    [J]. JOURNAL OF THE LESS-COMMON METALS, 1988, 143 (1-2): : 101 - 112
  • [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] HIRAMOTO M, 1990, CHEM LETT, V119
  • [7] Horowitz G, 1998, ADV MATER, V10, P365, DOI 10.1002/(SICI)1521-4095(199803)10:5<365::AID-ADMA365>3.0.CO
  • [8] 2-U
  • [9] Macdonald J. R., 1987, IMPEDANCE SPECTROSCO
  • [10] MAENNIG B, IN PRESS PHYS REV B