A patented hybrid engine combining Avalon's LED architecture with a tungsten-halogen blackbody fill, so the spectrum stays tunable from 300 nm right out to 1900 nm. The top of LED-based AM0 measurement, sized for a normal lab bench instead of a flash hall.
Multi-junction solar cells are how the space industry squeezes 30 %+ efficiency out of the AM0 spectrum. They are also why you cannot measure them the same way you measure a silicon module. The simulator has to do something different, and that difference is what Cosmo is built around.
A multi-junction cell is a stack of two, three or four sub-cells with different bandgaps, optically transparent above their bandgap and absorbing below it. Photons split themselves across the stack: short wavelengths are caught by the top junction, longer wavelengths pass through and are absorbed deeper. The result is a single device that harvests far more of the AM0 spectrum than any single-junction silicon cell.
Junctions in a multi-J cell are series-connected, so the total photocurrent is set by whichever junction sees the least light in its band. If your simulator misses the spectrum on any one band, that band's junction current-limits the device, the IV curve shifts, and the efficiency number is meaningless. AM0 multi-junction measurement is an exercise in matching every band, not just looking close in the visible.
Cosmo gives you independent intensity control across the LED bands and the halogen fill, so each junction can be addressed at its operating point. The same machine then characterises 3J and 4J architectures across mission-specific spectra, AM0 to ASTM E490, lunar variants, Mars variants, custom, without changing a bulb or rebuilding the optics.
An LED simulator can replicate AM1.5G beautifully. Push past ~1100 nm into the deep IR and the physics gets uncooperative, phosphor LED efficiency falls off and laser-bank approaches turn the simulator into a custom optics project. Cosmo solves it with two coupled sources, each running where it actually wins.
The same Avalon LED architecture as the rest of the Nexun line, scaled to the bands and wavelengths an AM0 spectrum demands. Per-band intensity is independently controlled, so the engine can be retuned junction by junction without swapping hardware.
Past ~1100 nm the efficient phosphor coverage of LED simply runs out. Cosmo's patented design hands the deep-IR over to a tungsten-halogen source whose hot filament emits genuine blackbody radiation across the 1100–1900 nm window, which is exactly where the bottom junctions of modern 3J and 4J architectures live.
Cosmo isn’t locked to a single AM0 reference. The LED bank and the halogen fill are both software-controlled, so you can pull the spectrum into whichever shape your test plan demands, standard ASTM E490 AM0, lunar AM0 variants, the dustier Martian spectrum, or a custom mission-specific spectrum your customer hands you. No bulb swap, no optics rebuild.
Independent control of each LED band plus the halogen fill, so the photocurrent in each junction can be addressed without disturbing the others.
AM0, lunar, Martian, mission-specific, any spectrum that can be written as a target curve over 300–1900 nm can be requested from the simulator.
Reference cells per junction, traceable calibration chain, full audit logging, same calibration philosophy as the rest of the Nexun line.
Cosmo is a hybrid spectrum on top of an existing Avalon module simulator. Pick Pro Max if you need the bigger active area and shorter cycle for module-scale characterisation, or pick ULTRA if you need the tightest uncertainty budget and the 37-wavelength engine for reference-grade work.
Cosmo is the top of LED-based AM0 in the Avalon group. For the very top of the category, especially for very-large-area space modules, Pasan’s xenon SAT (Solar Absolute Tester) remains the reference instrument because its direct xenon irradiation gives an unbeatable spectral match across the whole AM0 range. Cosmo is the right tool when you want LED tunability, a per-band programmable spectrum, deep-IR coverage, and a footprint that fits in a normal lab.
Cosmo is the answer when the device under test is a 3J or 4J space cell, the spectrum has to be programmable, and the lab does not have the floor area (or the budget) for a xenon flash hall.
Active-area variants, junction-specific reference cells, and custom-spectrum configurations are detailed in the full datasheet. Request access below.
Junction architecture, target spectrum, active area, share what you need to measure and our application engineers will reply within a working day with a configuration.
