Nano-scale Schottky contacts: ultrafast drift-diffusion dynamics studied in the optical near field
✍ Scribed by M Achermann; U Siegner; L.-E Wernersson; U Keller
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 145 KB
- Volume
- 13
- Category
- Article
- ISSN
- 1386-9477
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✦ Synopsis
We present direct measurements of the ultrafast carrier dynamics around buried nano-scale Schottky contacts with high spatial and time resolution, performed with a novel femtosecond near-ÿeld scanning optical microscope. It is shown that high optically excited carrier densities screen the built-in ÿeld around a Schottky contact and allow for e cient transport of electrons towards the contact, followed by trapping of electrons into the metal. The experimental results are modeled by a self-consistent treatment of the drift-di usion equation for the carriers and Poisson's equation for the built-in electric ÿeld.