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LID + LETID

LID + LETID

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The PQP’s Light Induced Degradation (LID) and Light and Elevated Temperature Induced Degradation (LETID) tests quantify these cell-based phenomena that are often incorporated into energy yield models. LID varies by cell technology, but primarily impacts boron-doped cells and stabilizes shortly after module deployment. LETID most predominantly affected early generation PERC cells and is more severe in hotter climates. Degradation from LETID reaches its maximum point after months or years.

Key
Takeaways

96% of BOMs tested had < 1% power loss.

The LID+LETID results are better than ever, with a 0.43% median and 0.4% average degradation when combining the average LID value and the average LETID value for each BOM produced in 2023. This has resulted in the Top Performer threshold being raised to 1% for this test. See the Power Degradation graph below for more. See the Power Degradation graph below for more.

Test Result Spotlight

The graph below displays the average LID and LETID results for each BOM in the 2024 Scorecard dataset, separated by PERC and n-type (TOPCon, HJT and xBC) technologies. There are minimal differences across the cell technologies: the median post-LID power loss was 0.38% for PERC and 0.43% for n-type; and post-LETID, PERC had a 0.09% median power loss and n-type had a 0.19% median power gain. Most notable is the power recovery seen on many BOMs post-LETID. This is likely due to an artifact of the cell stabilization processes (e.g., LETID mitigation) that are common amongst some cell manufacturers.

Test Result Spotlight

LID and LETID results for each BOM in the 2024 Scorecard dataset, separated by cell technology. Note that according to the module manufacturers, only one of the PERC BOMs was doped with boron and it is not the lowest performer. All other p-type PERC BOMs were doped with gallium.

Power Degradation of LID+LETID BOMs

Power degradation chart for LID stress sequence View Box Plot Interpretation Guide

A case study on why LID is important, what PV module materials are assessed, and the test procedure can be found here on kiwa.com/pvel.

Kiwa PVEL Top Performer

See LID + LETID Top Performers

Click here to see the 345 model types listed as LID + LETID Top Performers.

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