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DOE OSTI · 3685182

PV Durability at Scale: Assessing Bifacial and TOPCon Field Performance

Deline, Chris [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000298678930)·Ovaitt, Silvana [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:000000030180728X)·Jordan, Dirk [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000221837489)·Kern, Dana [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000308148723)·Parker, Josh [National Laboratory of the Rockies, Golden, CO (United States)]·Sekulic, Bill [National Laboratory of the Rockies, Golden, CO (United States)]
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Abstract

Recent field performance results of TOPCon and PERC Bifacial modules are presented based on small-scale deployments at NLR, and a selection of 3rd-party residential data. Bifacial PERC degradation rates are a median of -1 % / yr with bifacial TOPCon modules at a similar rate of -1.1 %/yr over the first couple of years. Comparable PERC Monofacial modules have a degradation rate of -0.5%/yr. Some TOPCon modules exhibited an indoor dark metastability effect which requires recovery by light soaking or UV exposure prior to IV curve measurement. Further monitoring is needed to confirm the long-term stability of TOPCon modules.

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Deline, Chris [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000298678930), Ovaitt, Silvana [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:000000030180728X), Jordan, Dirk [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000221837489), Kern, Dana [National Laboratory of the Rockies, Golden, CO (United States)] (ORCID:0000000308148723), Parker, Josh [National Laboratory of the Rockies, Golden, CO (United States)], Sekulic, Bill [National Laboratory of the Rockies, Golden, CO (United States)]. 2026-09-02. PV Durability at Scale: Assessing Bifacial and TOPCon Field Performance. https://doi.org/10.66816/pr4994098

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