ISSN:
1432-0630
Keywords:
42.65.Gv
;
72.20.Ht
;
72.20.Jv
;
78.50.Ge
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract A study of saturation of the absorption and photoconductivity of Sb and P donors in Ge for radiation of 90 μm wavelength, i.e., of energy very closely above their ionization edges is presented at T=9.3 K. Under these conditions negligible heating by the excess radiation energy is expected, which provides a convenient opportunity to study the kinetics of photoionization and recombination. From these measurements we have determined the donor capture cross section of electrons at 9.3 K to be σc=(1.2±0.7)×10−12cm−2, and the relaxation time from the 2s to the ground state as τ21=(5.8±1.0)×10−10s. The saturation intensity of the absorption coefficient is around three orders of magnitude higher than the saturation intensity of the photoconductivity. We explain the nonlinear photoconductivity by the Debye-Conwell dependence of the mobility on the number of photoionized donors and compensating acceptors.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00351898
Permalink
