Fabrication and effect of the dielectric permittivity on the ideality factor of MEH-PPV Schottky diodes doped with electron acceptor fluorescent dyes
✍ Scribed by Fatima E. Ahmed; O.A. Yassin
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 137 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0026-2692
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✦ Synopsis
Polymeric Schottky diodes have been prepared using poly[2-methyl-5-(2 0 -ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) conducting polymers. The I-V characteristics of these diodes are interpreted in terms of thermoionic emission (TIE) conduction process. Upon blending the polymer with Nile blue (NB) dye the conduction shows a cross-over from space-charge limited conduction (SCLC) to TIE at biasing voltages larger than 4 V. Disappearance of SCLC is seen in Rhodamine B (RhB)-based diodes and the conduction is interpreted in terms of the TIE process. Inclusion of the dielectric permittivity of the polymer/dye blends in interpreting the I-V characteristics of diodes is found to be crucial. A significant reduction of the ideality factor (n) from 6 to 1.8 is determined when MEH-PPV is mixed with NB or Rhodamine fluorescent dyes.