Determination of the density of recombination centers in a photorefractive guest—host polymer
| Autor: | G. Bäuml, Uwe Hofmann, Stefan Schloter, Dietrich Haarer |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Chemistry
Mechanical Engineering Photoconductivity Metals and Alloys Phase (waves) Photorefractive effect Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Amplitude Mechanics of Materials Modulation Electric field Polymer chemistry Materials Chemistry Charge carrier Recombination |
| Zdroj: | Synthetic Metals. 97:165-169 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/s0379-6779(98)00137-4 |
| Popis: | The density of deep traps for charge carriers significantly determines both the amplitude and the phase of the internal space-charge modulation in photorefractive polymers. We have measured the photoconductivity of a photorefractive guest—host polymer as a function of the external electric field and the sample temperature. Using theoretical models for charge carrier generation, transport and recombination, the density of recombination centers can be extracted. It is closely related to the density of deep traps. The results are compared with the density of pertinent traps, as obtained from phase shift measurements by holographic two-beam coupling techniques. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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