UVID
UV-induced degradation, a particular concern for TOPCon
Articles
- How UV Light "Steals" Module Lifetime: UVID ExplainedWith n-type modules now mainstream, ultraviolet-induced degradation (UVID) has turned from an "old problem" back into a reliability focus. We cover where UV comes from, how it dismantles the front passivation of the cell, why TOPCon is more sensitive, how the industry tests it, how to read the results, and mitigation at cell, material and module level. Key conclusion: UVID is a real problem, but a sizeable part of lab figures is recoverable metastability, and separating "recoverable" from "non-recoverable" matters more than fixating on a single degradation value.
- Same UV Test, Very Different UVID Results: Why? A New Fraunhofer Paper ExplainsA Fraunhofer ISE team has published a study of accelerated UV testing in Solar RRL: short-wave UV worsens near-surface defects, higher temperature suppresses degradation, defect generation is roughly proportional to UV dose but net degradation depends on the thermal budget, and UVID almost disappears under simultaneous UV and visible light. We unpack the four findings and, with Kiwa PVEL's latest data on 370 modules, look at what they mean for UV testing, reading test reports and cell design.
- How Much of the Power Lost in UV Testing Is Real? Trina Splits TOPCon UVID into Reversible and IrreversibleA Trina Solar team writing in SOLMAT divides ultraviolet-induced degradation in TOPCon cells into reversible r-UVID and irreversible ir-UVID, aligned with the recovery procedure in the proposed IEC TS 63624-1: a higher UV dose followed by a standardised light soak. What recovers is temporary loss; only what remains belongs in warranties and yield models. We unpack the logic of the classification, the status of the standard and the trade-offs in the passivation stack.