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Photothermal ionization spectroscopy (PTIS) has revealed highly excited states of both shallow donors and acceptors in ultra-pure silicon. At least eight discrete lines associated with the highly exeited states that are higher than 6p, level of phosphorus donors have bsen observed in the photothermal ionization spectra of n-type ultra-pure silicon. For p-type ultra-pure silicon, up to 12 discrete lines and fine structures of the lines associated with the excited states of boron acceptors have also been observed. The assignment of the lines has been made and discussed according to the effective mass theory(EMT) of shallow impurities in silicon.
Photothermal ionization spectroscopy (PTIS) has been highly excited states of both shallow donors and acceptors in ultra-pure silicon. At least eight discrete lines associated with the highly exeited states that are higher than 6p, level of phosphorus donors have bsen observed in the photothermal ionization spectra of n-type ultra-pure silicon. For p-type ultra-pure silicon, up to 12 discrete lines and fine structures of the lines associated with the excited states of boron acceptors have also been observed. The assignment of the lines has been made and discussed according to the effective mass theory (EMT) of shallow impurities in silicon.