The laboratory provides optical characterization of semiconductor materials and structures. Standard spectroscopic techniques – photoluminescence, photoreflectance, photoconductivity, photoresponsivity – can be applied at room as well as cryogenic temperatures. High-sensitivity detectors are available from near-UV to near-infrared. Signals are measured by a standard lock-in technique.
Equipment:
- Optical cryostat UTRECS with precise temperature regulation in the 4-300 K range, Institute of Physics, NAS of Ukraine.
- Argon-ion laser LGK 7872M (488 nm, 20 mW), LASOS Lasertechnik GmbH., QTH lamp (100 W, 350-2500 nm spectral range), Quantum Design GmbH; Xe arc lamp (150 W, 250-600 nm spectral range), Quantum Design GmbH.
- Monochromators: Digikrom DK240 (f 240 mm, 500-2800 nm range), CVI Laser Corp. now Spectral Products; MSH-300 (f 300 mm, 200-2400 nm range), QuantumDesign, Inc.; Shamrock SR500 (f 500 mm, wavelength range 200-2500), Oxford Instruments/Andor.
- Detectors: photomultiplier tube DH-30-TE (thermoelectrically cooled, 200-850 nm), Bentham Instruments Limited; Si photodiode (400-1100 nm), Photodyne Incorporated; Ge photodiode LN2-cooled G-050-E-LN6N (700-1500 nm), Electro-Optical Systems Inc.; InGaAs photodiode LN2-cooled J23D (extended wavelength range 700-2600 nm at room temperature, 700-2250 nm with LN2 cooling), Teledyne Judson Technologies LLC
- Lock-in amplifiers: model 5210, EG&G Princeton Applied Research Corp., now AMETEK Scientific Instruments, Inc.
Application:
- Photoluminescence
- Photoreflectance
- Photoconductivity
- Spectral responsivity of experimental structures and devices.
Contact: RNDr. Michal Kučera, PhD.
Access: Guided access, after agreement with the contact person
Price: 0 Eur/hour for SAS employees
LABORATORIES
On the closer table monochromator Shamrock (Oxford Instruments/ANDOR) with Bentham photomultiplier tube at the output slit (from the observer side) and QTH lamp (Quantum Design GmbH) at the entrance slit (opposite side, partly covered up by the monochromator and the shelf). On the distant table monochromator DIGIKROM (Spectral Products), infrared detector LN2-cooled (red), lasers and optical cryostat partially covered up by monochromator and the shelf. On the shelves on both tables, lock-in amplifiers EGG 5210.
LABORATORIES
A closer look at the distant table in the previous figure. In the right optical cryostat UTRECS, a blue light beam of Argon ion laser entering its window, on the shelf lock-in amplifier EGG 5210, under the shelf monochromator DIGIKROM, in the left an LN2-cooled infrared detector (red).