Infrared real-time-normalized photopyroelectric measurements of crystalline germanium: Instrumentation and spectroscopy

Publisher Website
Google Scholar
Abstract
An infrared photopyroelectric spectrometer with real‐time spectrum normalization capability measurements has been optimized and used for the spectroscopy of crystalline Ge, performed as a function of wavelength (1700–1960 nm) and modulation frequency (0.5 to 400 Hz), to determine the optical absorption and nonradiative quantum efficiency spectra. High‐modulation‐frequency (thermally thick limit: f > 40 Hz) data yielded the optical absorption‐coefficient spectrum, while at low modulation frequency (thermally thin limit: f<15 Hz) the nonradiative quantum efficiency spectrum was obtained self‐consistently by substitution of the experimental optical absorption coefficient spectrum to the thermally thin limit photopyroelectric theory. The experimental results will be discussed in the light of an existing photopyroelectric model [A. Mandelis and M. M. Zver, J. Appl. Phys. 5 7, 4421 (1985)] and in terms of well‐established semiconductor germanium physics.