| Autor: |
J. Opsal, A. Rosencwaig, P. Geraghty, Walter Lee Smith, David L. Willenborg |
| Rok vydání: |
1988 |
| Předmět: |
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| Zdroj: |
Photoacoustic and Photothermal Phenomena ISBN: 9783662137055 |
| DOI: |
10.1007/978-3-540-48181-2_59 |
| Popis: |
In modulated reflectance experiments on silicon wafers the signal arises primarily from the Drude modulation of the silicon refractive index from the laser generated electron-hole plasma density [1,2]. We have recently found that both the magnitude and phase of the modulated reflectance signal, ΔR/R, are usually dependent on the duration of continuous pump and probe laser irradiation [1]. We attribute this temporal behavior of the ΔR/R signal to a laser induced modification of the defect-related electronic interface states at the Si/Si02 interface which act as trapping sites for the photogenerated carriers. Furthermore, there appear to be two broad categories of such interface states; stable and metastable. The stable states undergo temporal modification only under continuous high intensity laser irradiation, while the metastable states also exhibit spontaneous temporal evolution. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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