Abstract
Very strong accumulation layers with excess surface-electron densities of DELTA N equals 5 multiplied by 10**1**3 cm** minus **2 and higher have been obtained on single-crystal ZnO surfaces by photodesorption of oyxgen. The kinetics of oxygen chemisorption under such extreme accumulation conditions has been studied as a function of oxygen pressure, excess surface-electron density DELTA N, and temperature. The chemisorption rate is extremely slow and is directly proportional to the oxygen pressure. It is thermally activated with an activation energy of about 0. 25 eV. Both chemisorption and photodesorption rates vary exponentially with DELTA N. This is most surprising in view of the fact that an accumulation layer is present at the surface throughout the adsorption range studied. Possible models to account for the observed adsorption characteristics are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 508-530 |
| Number of pages | 23 |
| Journal | R.C.A. Review |
| Volume | 36 |
| Issue number | 3 |
| State | Published - 1975 |