Improved band alignment for hole injection by an interfacial layer in organic light emitting devices

Chkoda, L.; Heske, C.; Sokolowski, M.; Umbach, E.
August 2000
Applied Physics Letters;8/21/2000, Vol. 77 Issue 8
Academic Journal
We demonstrate that a thin organic interfacial layer of 3,4,9,10 perylenetetracarboxylic dianhydride (PTCDA) can be utilized to improve the band alignment of N,N′-di-(3-methylphenyl)N,N′diphenyl-4,4′diaminobiphenyl (TPD) films on [indium-tin-oxide (ITO)] (InSnO) substrates in, e.g., organic electroluminescent devices. A photoemission study of the highest occupied molecular orbital (HOMO) and vacuum level position as a function of the organic overlayer thickness reveals that due to chemisorptive bonding a thin PTCDA interlayer results in a reduced barrier between the Fermi level of ITO and the HOMO of TPD. Furthermore we detect a new molecular state 0.6 eV below the Fermi level at the PTCDA/ITO interface. Both effects are expected to improve the hole injection from the ITO anode into the TPD hole transport layer, e.g., in organic light emitting devices. © 2000 American Institute of Physics.


Related Articles

  • Structural templating and growth behavior of copper phthalocyanine thin films deposited on a polycrystalline perylenetetracarboxylic dianhydride layer. Dajung Hong; Young Rag Do; Hyon Tae Kwak; Sanggyu Yim // Journal of Applied Physics;Mar2011, Vol. 109 Issue 6, p063507 

    Structural templating and the growth behavior of copper phthalocyanine (CuPc) thin films deposited on a polycrystalline 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) layer were examined using x-ray diffraction (XRD) and atomic force microscopy. The templated CuPc films were found to grow...

  • Thermal oxidation mechanism and stress evolution in Ta thin films. Yusung Jin; Jae Yong Song; Soo-Hwan Jeong; Jeong Won Kim; Tae Geol Lee; Ju Hwang Kim; Junhee Hahn // Journal of Materials Research;Jun2010, Vol. 25 Issue 6, p11 

    Oxidation-induced stress evolutions in Ta thin films were investigated using ex situ microstructure analyses and in situ wafer curvature measurements. It was revealed that Ta thin films are oxidized to a crystalline TaO2 layer, which is subsequently oxidized to an amorphous tantalum pentoxide...

  • Electrospun poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) fibers: Preparation and potential for use in filtration applications. Patcharaporn Thitiwongsawet; Prapaporn Sae-Lee; Preeya Kwanduen; Watchanida Chinpa; Pitt Supaphol // Songklanakarin Journal of Science & Technology;May/Jun2011, Vol. 33 Issue 3, p315 

    Poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) (PEI) fibers were successfully prepared by electrospinning from PEI solutions in dichloromethane (DCM), 1,2-dichloroethane (DCE), N-methylpyrrolidone (NMP) and certain mixtures between NMP and N,N-dimethylformamide (DMF)....

  • Absorption and Emission of Excitons in thin PTCDA Films and PTCDA/Alq3 Multilayers. Wagner, H. P.; DeSilva, A.; Gangilenka, V. R.; Kampen, T. U. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p1097 

    We investigate the exciton absorption and emission in 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) thin films and PTCDA/aluminium-tris-hydroxyqinoline (Alq3) multilayers in the temperature range from 10 to 300 K. In the multilayers a strong recombination band is observed at 1.63 eV....

  • Fabrication of Cellulose Acetate Film From Oil Palm Empty Fruit Bunch (OP-EFB) and Cytotoxicity Evaluation. Mohamad, Dasmawati; Wan Hamzah, Wan Suzaini; Wan Daud, Wan Rosli; Rajion, Zainul Ahmad; Wan Bakar, Wan Zaripah; Ibrahim, Mazlan // Pertanika Journal of Science & Technology;Jan2012, Vol. 20 Issue 1, p189 

    The aims of this study were to fabricate cellulose acetate (CA) film from oil palm empty fruit bunch (OP-EPB), as well as to characterize and evaluate their biocompatibility. Several processes were carried out, and these included prehydrolysis-soda method, chlorine free bleaching method,...

  • Picosecond laser structuring of thin film platinum layers covered with tantalum pentoxide isolation. Heise, Gerhard; Trappendreher, Daniel; Ilchmann, Florian; Weiss, Robin S.; Wolf, Bernhard; Huber, Heinz // Journal of Applied Physics;Jul2012, Vol. 112 Issue 1, p013110 

    A thin film layer system consisting of platinum (Pt) as conductive layer on a glass substrate and tantalum pentoxide as isolating layer on top of the platinum is attractive for designing biocompatible conductor paths and contact pads for bio sensor chips. For the flexible and rapid patterning of...

  • A Nanopatterning Technique: DUV Interferometry of a Reactive Plasma Polymer. Sablon, Kimberly // Nanoscale Research Letters;Apr2009, Vol. 4 Issue 4, p389 

    The article focuses on the nanopatterning techniques concerning the fabrication of chemical and topographical materials. It says that one successful technique for functional surfaces is the plasma polymerization. The technique allows the plasma-chemical surface functionalization to be...

  • Effect of thermal curing on the properties of thin films based on benzophenonetetracarboxylic dianhydride and 4,4′-diamino-3,3′-dimethyldiphenylmethane. Sava, Ion; Chişcă, Ştefan; Brumă, Maria; Lisa, Gabriela // Journal of Thermal Analysis & Calorimetry;Jun2011, Vol. 104 Issue 3, p1135 

    The processing of polyimide films from polyamidic acid solutions involves the simultaeous loss of solvent and chemical conversion, and may imply structural reorganization such as orientation or crystallization. The effect of thermal treatment on the thermal, mechanical and dielectric properties...

  • Synthesis, characterization, and photovoltaic application of NiTiO nanostructures via two-step sol-gel method. Sobhani-Nasab, Ali; Hosseinpour-Mashkani, S.; Salavati-Niasari, Masoud; Taqriri, Hossein; Bagheri, Samira; Saberyan, Kamal // Journal of Materials Science: Materials in Electronics;Aug2015, Vol. 26 Issue 8, p5735 

    In this work, 1,3,5-benzenetricarboxylic acid (trimesic acid) was used as chelate agent for synthesis of NiTiO nanoparticles through a two-step sol-gel method. In this study, nickel acetate tetrahydrate [Ni(CHCOO)·4HO] and tetra- n-butyl titanate (TNBT) were used as starting reagents to...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics