Optical absorption coefficient and non-radiative quantum efficiency photopyroelectric spectra of pure crystal silicon from a single modulation frequency

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Abstract
In this work we present and analyze photopyroelectric experimental data obtained for pure crystalline silicon by a novel, compensating differential photopyroelectric spectrometer. The measurements were performed as a function of wavelength (1000–1400 nm) and modulation frequency (15 to 275 Hz). The experimental results will be discussed in the light of an existing photopyroelectric model and in terms of well established semiconductor silicon physics. We illustrate, for the first time, the possibility of extracting the optical-absorption-coefficient and the non-radiative quantum efficiency spectra self-consistently; by using only one experimental photopyroelectric spectrum at a single modulation frequency.