Far-infrared photoconductivity spectra of quenched-in acceptors in Germanium: absorption and photo-thermal ionization lines of two new shallow acceptors
1981; Elsevier BV; Volume: 40; Issue: 2 Linguagem: Inglês
10.1016/0038-1098(81)90156-3
ISSN1879-2766
AutoresJ. Broeckx, Yōichi Kamiura, P. Clauws, J. Vénnik,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe far-infrared photoconductivity spectra of germanium crystals quenched from T>800C show three new sets of hydrogenic acceptor excitation lines, in addition to the 8.69 meV (SA'1) and 9.48 meV (SA“1) acceptor series reported earlier. The corresponding ground state binding energies are 13.89 meV (SA'2), 14.42 meV (SA“2), and 17.89 meV (SA3). We tentatively attribute both the SA'2 and the SA“2 line series to one acceptor complex with a multiple ground state. At high acceptor concentrations the excitation lines are seen as sharp minima superimposed on a continuous photoconductivity background. With decreasing acceptor concentration, or increasing temperature, they gradually evolve into the familiar positive-going photo-thermal ionization peaks. This is explained by the different concentration and temperature dependence of the cross-sections for the absorption and photo-thermal ionization mechanisms.
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