Nanosecond microscopy of capacitance at SiO2/4H-SiC interfaces by time-resolved scanning nonlinear dielectric microscopy

Y. Yamagishi, Y. Cho

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The time-resolved measurement of capacitance is a powerful method in the evaluation of defects in semiconductors, carrier dynamics in quantum dots, and photo-induced dynamics in photovoltaic materials. In this study, we demonstrate time-resolved capacitance measurements at the nanoscale using scanning nonlinear dielectric microscopy. We detected the capacitance transient of SiO2/4H-SiC interfaces triggered by the application of a 3 ns pulse, showing the high temporal resolution of the developed method. We exemplified the method with the evaluation of the density and activation energy of defects at SiO2/4H-SiC interfaces that verified the quantitative capability and high sensitivity of the method. Two-dimensional mapping of the interface states showed nanoscale inhomogeneous contrasts, implying that the physical origin of the defects at SiO2/4H-SiC interfaces is microscopically clustered.

Original languageEnglish
Article number163103
JournalApplied Physics Letters
Volume111
Issue number16
DOIs
Publication statusPublished - 2017 Oct 16

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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