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Auxiliary Diagnostic Signal for Deep-Level Detection.

Il-Ho Ahn1, Dong Jin Lee1, Deuk Young Kim1,2

  • 1Quantum-Functional Semiconductor Research Center, Dongguk University, Seoul 04620, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|November 10, 2023
PubMed
Summary

Temperature-dependent curve-fitting errors in Schottky diodes offer a new diagnostic tool. This method enhances the accuracy and efficiency of deep-level transient spectroscopy (DLTS) techniques like Laplace Transform-DLTS and Isothermal Capacitance Transient Spectroscopy.

Keywords:
I–V curve fittingdeep-level transient spectroscopy

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Area of Science:

  • Semiconductor physics
  • Materials science
  • Electrical engineering

Background:

  • Capacitance Deep-Level Transient Spectroscopy (CDLTS) is a standard technique for characterizing defects in semiconductors.
  • Overlapping signals in DLTS can complicate accurate defect analysis.
  • Existing methods require extensive temperature scans, impacting efficiency.

Purpose of the Study:

  • To introduce temperature-dependent curve-fitting errors as an auxiliary diagnostic signal for DLTS.
  • To demonstrate the time-efficiency and accuracy enhancement of Laplace Transform-DLTS (LT-DLTS) and Isothermal Capacitance Transient Spectroscopy (ICTS) using this new signal.
  • To validate the method on Be-doped GaAs with overlapping DLTS signals.

Main Methods:

  • Utilizing temperature-dependent curve-fitting error values from Schottky diode forward I-V curves.
  • Applying Laplace Transform-DLTS (LT-DLTS) and Isothermal Capacitance Transient Spectroscopy (ICTS) methods.
  • Comparing results with traditional Capacitance DLTS (CDLTS) and Fourier Transform DLTS (FTDLTS) across a wide temperature range.

Main Results:

  • Curve-fitting errors effectively serve as an auxiliary diagnostic signal, correlating with CDLTS.
  • LT-DLTS and ICTS analyses within a specific temperature range around Tpeak show good agreement with full-range CDLTS and FTDLTS.
  • Intensive LT-DLTS signals were observed around Tpeak, corroborated by ICTS results.
  • The curve-fitting error signal's origin is linked to increased misfit error from deep-level trap thermal emission near Tpeak.

Conclusions:

  • Temperature-dependent curve-fitting errors provide a valuable, time-efficient auxiliary diagnostic for DLTS.
  • The proposed method enhances accuracy for techniques like LT-DLTS and ICTS, especially for complex spectra.
  • This approach offers a more efficient alternative for semiconductor defect characterization.