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Modulated free‐carrier absorption in silicon – a spectroscopy approach
Author(s) -
Bychto Leszek,
Patryn Aleksy
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451416
Subject(s) - free carrier absorption , free carrier , signal (programming language) , relaxation (psychology) , absorption (acoustics) , spectroscopy , materials science , silicon , phase (matter) , wavelength , scattering , optics , analytical chemistry (journal) , optoelectronics , chemistry , physics , psychology , social psychology , organic chemistry , chromatography , quantum mechanics , computer science , programming language
In the paper, an analysis of the spectral characteristics of the MFCA (modulated free‐carrier absorption) signal for silicon 3–5 Ω cm, n‐type is presented. During the change of the wavelength of a probe light, three distinctive regions are observed in the amplitude and the phase characteristics. In the first region ( λ probe << hc / E g ), only the PCR (photocarrier radiometry) signal exists. The second region ( λ probe > hc / E g ) is typical for the MFCA signal. The nature of the third region ( λ probe near hc / E g ), characterized by a long relaxation time is being studied here. The spectroscopy approach to the MFCA technique provided an opportunity to explain the type of free‐carrier scattering mechanism that dominates in the NIR region. In the paper, an attempt was also undertaken to estimate the recombination parameters of the sample.