PET - Model IQE1100 - Internal Quantum Efficiency Measurement System
From Spectral Response Systems
Quantum Efficiency (QE) measurements provide a primary characterization method for completed photovoltaic devices. QE system provides electronics and software designed for fully automated measurement of external quantum efficiency of solar cells. All systems include probes and a fixed plate sample stage for samples up to 150 mm x 150 mm. The main system components include: custom designed software, measurement electronics, and computer system (Windows 8 operating system).
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Main System Capabilities
The measurement involves focusing monochromatic light to a spot on the device under test, then accurately measuring the photon flux and current from the test cell. The system utilizes a dual beam configuration with lock-in detection, providing an absolute accuracy of ±3%. The QE system uses a grating monochrometer with silicon/lnGaAs/Ge detectors. The system includes automatic order sorting filters and two light sources for monochromatic illumination (a Xenon- arc lamp and a halogen lamp). A single lock-in amplifier is used to measure both the reference detector and test device. The main system comes with all the hardware needed to measure quantum efficiency, a fixed plate sample stage and probes.
Custom designed software using LabView2009 provide...
Custom designed software using LabView2009 provides a user-friendly operation for data collection, plotting and analysis. The software provides flexibility and ease of use in the measurement and manipulation of QE. Full manual control over the mono-chrometer and order sorting filters is provided for diagnostic purposes. The wavelength range and step size during measurements are user definable. Data stored to disc can be directly examined within the supplied software, or can be exported to a text file readable by most third party software packages. Up to six data sets can be plotted on a single graph for comparison. The calculated QE is convoluted with a standard AM1.5 global spectrum to determine the short circuit current.
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