Thermally stimulated luminescence versus thermally stimulated current in organic semiconductors
| Autor: | Roland Schmechel, Vladimir Arkhipov, H. von Seggern, E.V Emelianova |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Chemistry
Exciton Binding energy Chemie Analytical chemistry Activation energy Condensed Matter Physics Dissociation (chemistry) Electronic Optical and Magnetic Materials Organic semiconductor Condensed Matter::Materials Science Chemical physics Metastability Materials Chemistry Ceramics and Composites Charge carrier Luminescence Elektrotechnik |
| Zdroj: | Journal of Non-Crystalline Solids. :626-629 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2004.03.056 |
| Popis: | A unified model of hopping thermally stimulated luminescence (TSL) and thermally stimulated current (TSC) in disordered organic semiconductors and polymers is suggested. The differences between photoinduced TSL and TSC, measured on the same sample, are explained by the fact that metastable geminate pairs of charges rather than free carriers are primarily photogenerated in these materials. Since the Coulomb interaction does not prevent carriers from recombining into excitons, the rate-limiting step in the TSL kinetics is carrier release from traps. However, the Coulomb binding energy strongly affects the dissociation of geminate pairs into free charge carriers and, therefore, it changes the apparent activation energy of TSC. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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