Background subtraction in Fourier-domain mobility spectrum analysis for resolving low-mobility carriers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Narrow gap semiconductors and superlattices relevant to optoelectronics often host multiple conducting species, such as electrons and holes, requiring a mobility spectral analysis (MSA) method to separate contributions to the conductivity. Building on the Fourier-domain MSA (FMSA) method proposed previously by the authors, we introduce a background subtraction step prior to FMSA to more accurately extract the spectral mobilities below what is normally considered the low mobility threshold μth = 1/Bmax, where Bmax is the maximum magnetic field of the experimental data under analysis. This preliminary step subtracts a linear background from the magnetotransport data and enables a more accurate fit in the low mobility range by several orders of magnitude. Background subtraction extends the useful low-mobility limit by a factor of 5 to μmin = 1/5Bmax, and can be easily applied in other MSA techniques where low mobilities are of interest.
Original languageEnglish (US)
Title of host publicationProceedings SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV
EditorsManijeh Razeghi
StatePublished - 2017

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