Definition
LeTID (Light and elevated Temperature Induced Degradation) is a slower form of PV module degradation in PERC cells occurring over months at elevated cell temperatures. Total loss typically 2–4% over module lifetime; reduced in modern PERC and absent in TOPCon/HJT.
Key Takeaways
- LeTID = slower-onset PERC cell degradation at elevated temperatures.
- Total loss 2–4% over module life.
- Absent in n-type TOPCon and HJT cells.
- Mitigated in modern PERC via “anti-LeTID” treatment.
- Hot climates worsen LeTID.
Frequently Asked Questions
1 commonly searched questions about LeTID.
What causes LeTID?
Boron-hydrogen complex formation at elevated cell temperatures + light exposure. Primary in PERC cells; absent in n-type cells (TOPCon, HJT).
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