Designed To Measure Cells Up to Six Junctions
pLEDss for Multi-Junction Cells
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Designed for Multi-Junction Solar Cells
Insufficient power in a single junction can destroy measurements of the entire cell. Even the earliest pLEDss prototypes produced enough light to power ultraviolet, visible and infrared junctions.
pLEDss was designed in partnership with NASA to solve the most difficult solar cell challenges, multi-junction cells for space, using the highest accuracy methods. pLEDss can measure any multi-junction cell, up to the most advanced 5 and 6 junction solar cells, with proven test and verification methods.
Measure and Pass Specifications for Every Junction
A single poorly performing junction can cause large errors in solar cell tests.
pLEDss solar cell spatial uniformity and temporal stability metrics exceeds Class A standards for each junction. Measurement of metrics for each junction ensures the high levels of performance for accurate multi-junction cell measurements.
Calibration of Any Cell Location to Isotypes
Fully automated pLEDss frames add motion automation so any single-junction isotype calibration standard can visit the location of any cell in a coupon or panel. This allows calibration or verification at any location in the panel with the calibration standard for any junction with the press of a button.
Optional Fully Automated Calibration Verification
Fully automated pLEDss frames can verify the calibration for any location with any calibration standard. While not needed for average testing, this can be used to verify beam performance before and after tests that require the highest level of measurement certainty.
When performed at the location of every cell under test, fully automated verification measures exact beam illumination and all assumptions about beam calibration and drift are removed, and measured values for beam output are given. This data delivers the lowest error and uncertainty for measurements requiring the most demanding performance.
Patented, Junction Current Match (JCM) calibration improves performance even further
Full automation can use measured values for every junction at every cell location to further enhance the beam calibration. This patented, fully-automted method is called Junction Current Match (JCM).
JCM calibration exceeds the default, high-performance, better-than-class-A performance with a single button press. For small area testing, this method can produce beam current production error for every junction of every cell below 0.3%, which is far better than industry standard metrics for current production (1.0%), spatial non-uniformity (2.0%) and temporal stability (2.0%).
Space Simulator Comparison
| pLEDss - LED | Modified Terrestrial LED | Pulsed Xenon | Continuous Lamp | |
|---|---|---|---|---|
| Designed for multi-junction | yes | no | yes | limited |
| Measure specifications per junction | yes | no | yes | yes |
| Calibration of any cell location to isoypes | yes | no | no | no |
| Fully autotmated calibration verification, optional | yes | no | no | no |
| Patented JCM method | yes | no | no | no |