FIELD EVAPORATION OF n-Ge (111) IN HYDROGEN AND DECOMPOSITION OF GeH4 IN HIGH ELECTROSTATIC FIELDS

C. MAINKA, W. DRACHSEL, J. H. BLOCK, G. KOZLOWSKI
1989 Le Journal de Physique Colloques  
Using a field ion microscope, the field evaporation rate o f Ge(17 1) in hydrogen at pressures ranging fron t o mbar was determined. F~o m 80 t o 300 K the evaporation rate decreases, keeping the field strength constant (-1.5 VIA), or vice versa at a constant rate the needed evaporation voltage increases. Above 300 K the temperature dependence reverses, the evaporation rate increases stron ly with increasing temperature. Effective binding energies for the hydrogen promoting ?ield evaporation
more » ... ield evaporation were determined t o range from 32 meV t o 97 meV with increasing field strength. The evaporation rate is shown t o have d p~,dependence regardless of temperature or field strength.
doi:10.1051/jphyscol:1989824 fatcat:mcp4cbnryje6ni53w7use54nzm