TRMC Platform

Time Resolved Microwave Conductivity (TRMC) is a contactless method, based on the measurement of the change of the microwave power reflected by a sample induced by laser pulsed illumination. The relative change of the reflected microwave power is caused by a variation of the sample conductivity induced by the laser. For small perturbations of conductivity, proportionality between the reflected microwave power and the sample conductivity has been established.

The TRMC signal obtained by this technique is called (microwave) photoconductivity, it allows to follow directly, on the 10⁻⁹–10⁻³ s time scale, the decay of the number of electrons and of the holes after the laser pulse by recombination or trapping of the charge-carriers.

Main technical features

• Incident microwaves are generated by a Gunn diode of the Kα band at 30 GHz.
• The pulsed light source is an OPO laser (EKSPLA, NT342B) tunable from 225 to 2000 nm.  It delivers 8-ns FWMH pulses with a frequency of 10 Hz.
• The density of light energy received by the sample is 800 J.cm^-2 at 355 nm.

Sample preparation

• Powder or thin layers

Access conditions

• Reservation