8 February 2015 Introducing Fourier-domain mobility spectrum analysis (FMSA) to deduce multi-component carrier mobility and density
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Abstract
Compounds and heterostructures in optical devices often host multiple carrier species that contribute simultaneously to the total electrical conduction, making it difficult to distinguish the characteristics of each type. Here a Fourier-domain Mobility Spectrum Analysis (FMSA)1 is introduced to sort the conductivity contributions of different carrier species from magnetotransport measurements. Using simulated magnetotransport data from 0 to 15 T of a simple initial trial spectrum, FMSA iteratively adjusts the spectral points in either the mobility domain or its Fourier reciprocal space to fit a mobility range spanning over three orders of magnitude (μ = 670 ~ 1,000,000 cm2/V·s). With its alternating local and global adjustments, FMSA is able to recover the mobility distribution of test data, as verified in convergence plots of the total error as a function of iteration number. This technique resolves the mobility spectra as well or better than competing MSA techniques with a simple and elegant algorithm, while precisely resolving the smoothness and width of mobility peaks without artificial broadening.
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Boya Cui, Boya Cui, Yang Tang, Yang Tang, M. Grayson, M. Grayson, } "Introducing Fourier-domain mobility spectrum analysis (FMSA) to deduce multi-component carrier mobility and density", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937030 (8 February 2015); doi: 10.1117/12.2179825; https://doi.org/10.1117/12.2179825
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