Temperature dependence of the effectiveness of oxygen photodesorption on ZnO surfaces

P. O. Artamonov, A. A. Lisachenko

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

1 Цитирования (Scopus)

Аннотация

Measurements are made in ultra-high vacuum of the effectiveness of photodesorption, Φ, of oxygen with hν<3.2 eV and of the changes in band inclination, ΔVs, of zinc oxide within the 300<T<500 K temperature range. The Φ(T) function is seen to exhibit two maxima at T≈380 and ≈470 K replicating the oxygen thermodesorption spectrum, and ΔVs(T) is shown to correlate with them. A model is proposed that treats photodesorption as a multistage process. The first stage consists in the photodischarge of surface states of non-adsorbent origin followed by electron transfer from the absorbed oxygen to the vacated state. The discharged oxygen passes over to a predesorption state from which it is eventually desorbed. The temperature behavior of Φ is determined by a greater band inclination caused by electron transfer to surface states from the absorbed oxygen in the course of its desorption.

Язык оригиналаанглийский
Страницы (с-по)484-494
Число страниц11
ЖурналSoviet journal of chemical physics
Том11
Номер выпуска3
СостояниеОпубликовано - 1 дек 1992

Предметные области Scopus

  • Технология (все)

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