skip to main content

SciTech ConnectSciTech Connect

Title: Interface modified thermally stable hole transporting layer for efficient organic light emitting diodes

Electrical transport in thermally stable 2, 7-bis [N, N-bis (4-methoxy-phenyl) amino]-9, 9-spirobifluorene (MeO-Spiro-TPD) thin films has been investigated as a function of temperature and organic layer thickness. ITO/MeO-Spiro-TPD interface was found to be injection limited and has been studied in detail to find barrier height for hole injection. The thickness of tetra-fluoro-tetracyano-quinodimethane thin films were optimized to be used as hole injection buffer layer which resulted in switching of charge transport mechanism from injection limited to space charge limited conduction above a critical thickness of 3 nm. Hole mobility has been measured using transient space charge limited conduction (SCLC), field dependent SCLC, and top contact transistor characteristics. The charge carrier transport in interface modified hole only devices was analysed using Gaussian disorder model. The thermal stability of MeO-Spiro-TPD has been investigated by atomic force microscopy and X-ray diffraction studies. The study indicates a thermally stable and highly efficient hole transport material for application in organic semiconductor based devices.
Authors:
 [1] ; ; ;  [2] ;  [3]
  1. Amity Institute of Advanced Research and Studies (Materials and Devices), Amity University, Noida, Uttar Pradesh 201303 (India)
  2. Physics of Energy Harvesting Division, CSIR-National Physical Laboratory, CSIR-Network of Institute for Solar Energy (NISE), Dr. K.S. Krishnan Road, New Delhi 110012 (India)
  3. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 (India)
Publication Date:
OSTI Identifier:
22314583
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATOMIC FORCE MICROSCOPY; CHARGE CARRIERS; CHARGE TRANSPORT; HOLE MOBILITY; HOLES; INTERFACES; LAYERS; LIGHT EMITTING DIODES; ORGANIC SEMICONDUCTORS; SPACE CHARGE; STABILITY; TEMPERATURE DEPENDENCE; THICKNESS; THIN FILMS; TRANSISTORS; X-RAY DIFFRACTION