Abstract
The fine structure of the indirect absorption edge in highly compensated germanium has been investigated by the wavelength derivative technique. This technique offers significant advantages, the exciton knees in the indirect absorption being transformed into sharp peaks. With increasing impurity concentration in compensated samples the excitonic structure disappears. This phenomenon has been shown to be due to ionization of excitons in electric fields of randomly distributed impurity ions. The critical concentration found experimentally is 2 × 1017 cm−3, which agrees well with theoretical estimates.
| Original language | English |
|---|---|
| Pages (from-to) | 439-443 |
| Number of pages | 5 |
| Journal | Physica Status Solidi (B): Basic Research |
| Volume | 41 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1970 |
| Externally published | Yes |