Role of Electron Blocking Layer in Performance Improvement of Organic Diodes
| Autor: | Habib Bouchriha, Samir Romdhane, E. Hleli, Z. Ben Hamed, Daniel A. M. Egbe, M. Radaoui |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Electron mobility Materials science Solid-state physics Analytical chemistry Order (ring theory) Conductance 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Active layer Dielectric spectroscopy 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Diode |
| Zdroj: | Journal of Electronic Materials. 48:2794-2800 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | Charge-carrier mobilities in organic diodes based on an anthracene-containing poly(arylene-ethynylene)-alt-poly(p-phenylene-vinylene) generally known as AnE-PVstat, stacked with an electron blocking thin layer of NPB(N, N′-bis (1-naphythyl)-N, N-diphenyl-1,1′-biphenyl-4,4′-diamin) of various thicknesses are investigated through current density-voltage (J-V), capacitance-frequency (C-w), conductance-frequency (G-w) and impedance-frequency (Z-w) experiments in conventional structures of ITO/AnE-PVstat/NPB/Al. Analysis of J-V, C-w and G-w results show that current-density, capacitance and conductance of the active layer decrease with increasing NPB thickness and permit determination separately of a hole mobility of the polymer of the order of $$ \sim10^{ - 4} \,{\hbox{cm}}^{2}\, {\hbox{V}}^{ - 1} \,{\hbox{s}}^{ - 1} $$ . This value is less than the global mobility (7 × 10−4 $$ {\hbox{cm}}^{2} \,{\hbox{V}}^{ - 1} \,{\hbox{s}}^{ - 1} $$ ) obtained without the blocking layer, which probably includes electrons and holes mobilities and indicates that NPB absorbs the majority of electrons. Analysis of impedance spectroscopy results shows that the impedance (Z) and parallel capacitor (Cp) decrease and parallel resistance (Rp) increases with increasing NPB thickness layer. All these results clearly confirm the role of NPB as a blocking layer for the electrons. |
| Databáze: | OpenAIRE |
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