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Equipment for optical and electrical studies

Optical spectroscopy

Equipment for optical spectroscopy includes several setups for specific tasks, depending on emission wavelength, measurement temperatures, necessity of applying a magnetic field to the sample etc. Exciting radiation of different wavelengths can be supplied to any of the setups from a laser station including several lasers of different types (see below).

Multifunctional spectroscopic setup based on the spectrograph Princeton Instruments Action SP 2300

The setup is equipped by helium magnetooptical cryostat with a superconducting solenoid (magnetic fields up to 5T) Oxford Instruments SpectroMag SM-4 and contains insert for changing the temperature in a 1.5-300K range. It is also possible to use the helium flowing cryostat CF 1204 (Oxford Instruments) or the original liquid nitrogen cryostat. Various detectors from UV to mid-IR spectrum range are employed. The photoluminescence, electroluminescence, absorption and transmission spectra can be measured at magnetic fields up to 5T in the wide temperature range.

Spectroscopic setup based on the spectrograph Princeton Instruments Action SP 2500

The setup is equipped with the helium flow cryostat and optical detectors from UV up to IR spectrum range. It is possible to use the liquid nitrogen cryostat for express-characterization of semiconductor structures. The photoluminescence, electroluminescence, absorption and transmission measurements are carried out.

Multifunctional spectroscopic complex based on SDL-2 setup

The spectroscopic complex includes 2 optical monochromators and various systems of excitation and registration from UV to mid-IR. This setup may employ the helium closed cycle cryostat (manufactured by CRYO Industries,), allowing to perform measurements in the temperature range from 10K up to 300K. It is possible also to use the helium-flow cryostate CF 1204 (manufactured by Oxford Instruments) for measuring in a 2-300K range of temperatures, as well as the micro-photoluminescence cryostat JANIS ST-500 or the original liquid nitrogen cryostat. The photoluminescence, photoluminescence excitation, electroluminescence, absorption and transmission spectra can be measured in the spectral range 0.275-5.5 µm.

Exciting radiation sources (Laser station)

  • Diode-pumped solid state cw laser Verdi V10 manufactured by Coherent
  • CW narrow-band Dye laser with intra-cavity frequency doubling "Ametist" manufactured by "Tekhnoscan Joint-Stock company"
  • CW narrow-band Ti:Sapphire laser manufactured by "Tekhnoscan Joint-Stock company"
  • Semiconductor laser Coherent Cube (660 nm, 100 mW) (Coherent)
  • Semiconductor laser Coherent Cube (404 nm, 100 mW) (Coherent)
  • Semiconductor laser Coherent Cube (809 nm, 1 W) (Coherent)
  • UV He-Ag laser Photon Systems (200-250 nm)
  • He-Cd laser GKL-30UM(i) (325 nm, 22 mW)
  • Pulsed N2 laser (337 nm)
  • The diode-pumped solid state laser with intra-cavity frequency doubling ATC-53-250 (530 nm, cw up to 250 mW) manufactured by "ATC - Semiconductor Devices Joint-Stock company"
  • A xenon and halogen lamps for excitation in a wide spectrum range.

Detector systems

Spectral setups are equipped by up-to-date detector systems:

X-ray diffraction setup

A three-crystal X-ray diffractometer DRON-4M with resolution of 5 arcsec is available for structural characterization of heterostructures.

Electrical measurements

Equipment for electrical measurements consists of
  • DC power supply E3641A (Agilent Technologies)
  • DC power supply N5742A (Agilent Technologies)
  • DC power supply B5-71 (Russia)
  • Data Acquisition/Switch Unit 34970A (Agilent Technologies)
  • Sample holder for nitrogen storage dewar (magnetic fields up to 0.1T)
  • Sample holder for helium storage dewar (magnetic fields up to 1T)
  • Cryostat for express measurements at T=300K and 77K (magnetic fields up to 0.1T)
  • Setup for measurements of the Seebeck coefficient at 300K
The electrical equipment allows one to carry out
  • measurements of the Hall coefficient and resistivity in the temperature range 4.2-300K in standard Hall and Van der Pauw geometries
  • measurements of I-V curves in the temperature range 4.2- 300K
  • measurements of the Seebeck coefficient at 300K