COREMA - WT System

COREMA, Resistivity Mapping, Semi Insulating

Resistivity Mapping, Mobility and Carrier Concentration Measurements for Semi-Insulating SiC, GaAs, InP, GaN and CdTe Wafers

The COntactless REsistivity MApper designed for Wafer Topography (COREMA - WT) is a high performance diagnostic tool to characterize the resistivity of semi-insulating semiconductor wafers with precision, repeatability and detail. Full wafer resistivity topograms show fluctuations in the percent range with lateral resolution below 1 mm. It is used for routine production control as well as in-depth analysis supporting material R&D. 

Additional evaluation capabilities are available with the following systems:

COREMA – RM measures resistivity and the carrier mobility of GaAs and InP so it fully replaces the conventional Hall measurement. Again, no sample preparation or electrical contacts are required. 

COREMA – VT evaluates the temperature dependence of resistivity up to 600 K. The Arrhenius plot obtained by variable temperature measurements yields the Fermi level and other details of the compensation process. The system is intended for the growth optimization and quality assessment of semi-insulating SiC, CdTe and GaN.

COREMA – ER is designed to measure thin epitaxial layers with intermediate resistivity grown on high resistivity substrates, such as GaN on SiC or Sapphire.

COREMA-WT System Specifcations:

  • SiC, GaAs, InP, GaN and other semi-insulating materials
  • Resistivity: 1E5 - 1E12 ohm-cm (Extended Range Version)
  • Fast, 1% Repeatability
  • Non-Destructive Measurement
  • No Sample Preparation 
  • Up to 200mm Wafer Size
  • High Resolution Topograms
  • For Wafer Production and Process Development
  • High Speed - Approx. 20 minutes per wafer

Manufacturer's WebSite: SemiMap