IQE-200 Quantum Efficiency Measurement Systems
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IQE-200 Quantum Efficiency Measurement Systems Oriel Instrument’s IQE-200 Series Systems are turn-key quantum efficiency measurement instruments used to measure the External Quantum Efficiency (EQE) and Internal Quantum Efficiency (IQE) of solar cells, detectors, or other photon-current devices. These systems meet the ASTM E1021-12 standard test method for spectral responsivity measurements of photovoltaic devices. Wavelength accuracy is an impressive 0.5 nm, repeatability is +/-0.2% from 400 – 1000 nm, and spectral resolution is 10 nm (for systems with resolution down to 5 nm, please contact an Oriel Sales Engineer). We offer systems to cover the spectral ranges of 300 – 1100 nm and 300 – 1800 nm, for both AC-only and AC and DC operation. The all new IQE200 software commands the system’s components and acquires and displays both EQE and IQE results. A unique feature of the IQE200 is the patent pending optical design which removes the need to reposition the detector and sample, thereby eliminating positional errors. The software is intuitive, fast and accurate, yet flexible enough to support all cell types and measurement modes. The IQE200 is a true research instrument for solar cell analysis –supporting the changing needs of Researchers. • Fast, accurate and repeatable EQE and IQE measurements • Patent pending optical design eliminates the need to reposition detector and sample • Spectral responsivity, diffuse reflectance and Jsc measurements also supported • AC and DC mode measurement systems cover all cell types • Compliant to ASTM E1021-12 standard test method WHAT ARE EQE AND IQE? External Quantum Efficiency (EQE) is the ratio of the number of photons incident on a solar cell to the number of generated charge carriers. Internal Quantum Efficiency (IQE) also considers the internal efficiency - that is, the losses associated with the photons reflected back from the surface of the cell. In an IQE measurement, these losses are measured in order to calculate a net quantum efficiency – a much truer efficiency measurement. The patentpending Oriel IQE200 calculates both measurements simultaneously, ensuring the highest measurement accuracy. • All new software application acquires data from all channels in a single pass • Full complement of accessories include TE cooled vacuum chucks, light bias tools and X-Y motion stages • Custom system requirements supported EQE % Wavelength (nm) Fig. 1 Silicon Cell.

IQE-200 Quantum Efficiency Measurement Systems HOW DOES THE SYSTEM WORK? 17.81 (452.4) Fig. 2 IQE200 Software showing the Junction Current Calculator. 60.00 (1524) OTHER MEASUREMENTS SUPPORTED Other measurements possible with the IQE200 are: • Specular Reflectance • Junction Current • Spectral Responsivity • Diffuse Reflectance (systems with integrating sphere) 17.50 (444.5) CHOOSING THE SYSTEM TO MATCH YOUR CELL TYPE(S) Your cell type will determine the spectral range, method of measurement and additional accessories needed for accurate IQE and EQE measurements. Table 1 shows the features...

ALL NEW IQE200 SOFTWARE All IQE200 systems include a laptop computer with the IQE200 software preinstalled. Also loaded are all of the necessary calibration and reference files. The software controls all of the basic system components, including the Monochromator, order sorting filter wheel, and lock-in amplifier and chopper or power meter. The software acquires data from all channels in a single pass and generates the IQE and EQE curves in real time without the need to reposition detectors or sample. All data is automatically saved with a date and time stamp for easy identification. Fig. 4...

IQE-200 Quantum Efficiency Measurement Systems IQE200 ACCESSORIES Vacuum Chuck Assemblies and Probe Kits The model IQE-TC-VAC is a temperature controlled vacuum plate with a 1.0 inch (25 mm) travel X-Y stage; it holds samples from 2x2 to 6x6 inches (51x51 to 152x152 mm) and mounts directly to the sample plate on the IQE200 system. Temperature measurement range is -40 °C to 125 °C, +/-1 °C (chiller, dependent). The IQE-VAC is an economical alternative to the IQE-TC-VAC for samples not requiring cooling. It also includes a 1.0 inch (25 mm) travel X-Y stage and holds samples from 2x2 to 6x6...

Table 2 Recommended Filter Combinations for GalnP/Ga(ln)As/Ge Filter Model Filter Description Middle Layer Heat Absorbing KG1 Filter Bottom Layer ' Note, the FSR-KG1 Heat Absorbing Filter is used to protect the 900 nm Short Pass Filter. These two filters must be stacked together in the filter holder, with the SP Filter being inserted first (furthest away from the light source) — Top-lnGaP — Mid-GaAs — Bot - Ge ■—Filter Speclrnm Fig. 6 Light bias condition for GalnP (top layer of GalnP/Ga(ln)As/Ge triple-junction cell) | —Top-lnGaP — Mkl-6aAs — Bot-Ge — Filler Spectrum Fig. 7 Light bias...

IQE-200 Quantum Efficiency Measurement Systems CHOOSING THE CORRECT IQE SYSTEM We offer a full series of IQE200 systems and an array of complementary accessories. Use Fig. 9 to guide you in choosing a system that is customized for your needs. The choice is based on the four selection criteria shown in the diagram below. Our Sales Engineers are available to help ensure the appropriate selection for your needs. Contact us for assistance. CHOOSE THE SPECTRAL RANGE OF INTEREST CHOOSE THE MEASUREMENT METHOD REQUIRED FOR YOUR CELL TYPE(S) CHOOSE THE REFLECTANCE MEASUREMENT NEEDED FOR YOUR CELL...

CUSTOM REQUIREMENTS WELCOME ACCESSORY SPECIFICATIONS The IQE200 systems we detail here support the majority of solar cell characterization requirements, but we recognize that they do not support them all. We welcome the opportunity to work with you to adapt a system to meet your unique needs. Whether you need a system with mapping capabilities, or a system that will couple to a glove box, or simply a different spot size, we will work with you to design, build and deliver a system that meets your needs, budget and timeline. Contact an Oriel Sales Engineer to discuss your requirements. Vacuum...