Electronic and junction properties of poly(2,5-dimethoxyaniline)-polyethylene oxide blend/metal Schottky diodes

Li Ming Huang, Ten Chin Wen, A. Gopalan

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Schottky barrier diode devices were fabricated in a sandwich configuration with a blend film consisting of a conducting polymer, poly(2,5-dimethoxyaniline), PDMA in an insulating matrix, polyethylene oxide (PEO). The influence of two different dopants, sulphate anion (SA) or methane sulfonate anion (MSA), in the electronic properties of the device was followed using the devices: ITO/PDMA (SA)-PEO/Al and ITO/PDMA (MSA)-PEO/Al. Current (7)-Voltage (F) characteristics were recorded for making a comparative evaluation of the electronic and junction properties of the devices. The junction and electronic parameters were analyzed and compared in the light of differences in the electronic state, morphology and transport of carriers. The device turn on voltage was found to be higher for Al/PEO-PDMA (MSA)/ITO (∼3.0 V) in comparison to Al/ PEO-PDMA (SA)/ITO (-2.85 V). The electronic states of PDMA doped with SA or MSA dopant were ascertained by optical UV-Visible spectroscopy. AC-impedance measurements were made for the devices and the values of bulk resistance (Rc), depletion resistance (R d) and depletion layer width (W) were deduced through a proposed equivalent circuit. W for the device with PEO-PDMA (MSA) is more (∼24 nm) than the device with PEO-PDMA (SA) (∼8.5 nm). The observed higher Φ B for PDMA-PEO (MSA) is consistent with this observation.

Original languageEnglish
Pages (from-to)300-307
Number of pages8
JournalThin Solid Films
Issue number2
Publication statusPublished - 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


Dive into the research topics of 'Electronic and junction properties of poly(2,5-dimethoxyaniline)-polyethylene oxide blend/metal Schottky diodes'. Together they form a unique fingerprint.

Cite this