Formation of electron-hole pairs in a semiconductor by vibrationally-excited molecules
Abstract
Both one-dimensional and three-dimensional models are presented for the collision of a vibrationally-excited molecule with a semiconductor surface, where the transfer of vibrational energy leads to the formation of electron-hole pairs. The transition probability P is calculated as a function of the molecule-surface distance for real two systems, HCl + InSb and HCl + PbSe, as well as for some model systems with different values of parameters. While P generally increases as the distance decreases, there are some minima at intermediate distances. The overall probability is obtained as an approximate integral of P over the distance, and for thermal collisions values of a few percent are obtained. Such values are high enough for an experimental observation of electrical conductivity due to electron-hole pair formation.
- Publication:
-
Unknown
- Pub Date:
- July 1984
- Bibcode:
- 1984fehp.rept.....L
- Keywords:
-
- Conduction Electrons;
- Gas-Solid Interactions;
- Holes (Electron Deficiencies);
- Molecular Collisions;
- Semiconductors (Materials);
- Surface Reactions;
- Hydrogen Chlorides;
- Models;
- Molecular Excitation;
- Molecular Oscillations;
- Molecules;
- Three Dimensional Models;
- Solid-State Physics