Outdoor multiswitch setup for I_V curve measurement on photovoltaic modules
This system can;
-measure currents which are between 0-10A with a minimum of a 0,025A sensitivity.
-measure voltages which are between 0-240V with a minimum of a 0,02V sensitivity.
-measure the temperature of the modules
-take measurements at 1 minute intervals
-take short circuit current, open circuit voltage, maximum power point current and voltage measurements and graph a current-voltage curve.
-calculate module efficiency and
FF (Fill Factor)
-measure Global Solar Energy
Fundamental Research
PV Materials and Devices
Muğla University’s laboratories are equipped for detailed electrical, optical and structural characterization as well as chemical analyses of materials and devices used in the photovoltaic field. Standard solar cell parameters are measured under AM 1,5 G spectrum, 100 mW/cm2 radiation and 25 oC. Current conduction mechanisms in the dark and under illumination are studied. Current–voltage measurements of homojunctions and heterojunction photovoltaic diodes are routinly undertaken for a temperature range between 79 and 400 K. The I-V-T mesaurement rig includes a Keithley 236 Source/Measure Unit, a Keithley 2010 Multimetre, an Oxford ITC 502 Temperature controller, an Oxford Kryostat with quartz windows, Leybold Vacuum Pumps, and a light source with a fiber line.
In the device analysis, capacitance-voltage measurements are routine exercised using the HP 4192A impedance analyzer and a HP 3478 voltmeter. For detailed analysis admittance, spectroscopy of devices are investigated at temperatures between 100 and 360 K using 20 K steps. The admittance measurements are performed using an impedance analyzer, operating at frequencies between 100 Hz and 1 MHz for a temperature range between 79 and 400 K. Capacitance-Voltage-Temperature (C-V-T) and Conductance-Voltage-Temperature (G-V-T) behaviours of devices at frequencies between 100Hz and 10MHz under different illumination levels are studied using HP 4192A LF Impedance Analyzer, HP 3478 voltmeter.
Optical and electro-optical asessment and defect investigations of semiconductor materials and quantum efficiency of devices are undertaken using a dual beam spectral measurement system. This system consists of a Cornerstone Monochrometer, a 250 W Radiometric Light source, an Optical Chopper and controller, a Lock-in amplifier, a current preamplifier, an electrometer, an optical table and accessories, a radiometric fiber-optic light source, DC voltage sources (35 V/ 1.4 A, or 0-60V/ 0.8 A and 1200 VDC), a liquid nitrogen tank, gas cylinders (nitrogen, oxygen, argon) and regulators.
The system for the steady-state photocarrier grating (SSPG) method is under construction to be used together with the dual beam spectral measurements system on the same optical table and will use the same optical cryostat system with little optical modifications without exposing the samples to air. The parts of the system are a He-Ne laser, a Lock-in amplifier, an electrometer, a DC voltage source, an Optical table and accessories, a JANIS VPF475 Cryostat system. A steady-state photoconductivity (SSPC) system is also under construction. It will use high intensity monochromatic above bandgap light to measure conductivity under illumination.
Spectral Measurement System of Solar Irradiation
The Muğla region has 3 thermic power stations which use high sulphur and low calorie lignite and total 1680 MW. In order to determine the gas and particles in the atmosphere the spectral analysis of solar radiation is carried out between 200-1100 nm with different wavelength intervals. The changes in total O3, NO2, SO2, O2 and aerosol diffusion in Muğla’s air is monitored regularly.