C-29

Evidence

1. S. Bai et al., "Planar perovskite solar cells with long-term stability using ionic liquid additives," Nature 571, 245-250 (2019), DOI: 10.1038/s41586-019-1357-2.
Adding BMIMBF4, an imidazolium-based ionic liquid, inside the absorber improved stability; interface-only addition did not reproduce the high-temperature benefit. Encapsulated devices underwent open-circuit ageing under full-spectrum xenon illumination at 76 mW/cm^2, with a reported chamber temperature of 70-75 degrees C. They were periodically removed and cooled for measurement. After 1,885 h, the most stable cell had lost about 5% of its scanned current-voltage efficiency but about 15% of its stabilized power output. The distinction is material: the frequently quoted approximately 95% retention concerns scanned efficiency, and the ageing experiment did not continuously extract maximum power. See Fig. 4 and the stability-characterization methods.

2. Q. Jiang et al., "Towards linking lab and field lifetimes of perovskite solar cells," Nature 623, 313-318 (2023), DOI: 10.1038/s41586-023-06610-7.
Mixed MeO-2PACz/Me-4PACz self-assembled monolayers improved ion blocking at the ITO/hole-contact/perovskite interface. Indoor tests used nitrogen, 1.2-sun white LEDs and a fixed 510-ohm load near maximum power. Projected average T80 improved about 2.8-fold; approximately 8,200 h at 50 degrees C was extrapolated from approximately 3,100 h of measurement. Fourteen glass/PIB-encapsulated improved-contact cells retained a mean 90.1% of initial efficiency after 22 weeks outdoors under the same fixed resistance. Efficiency was checked periodically indoors. The light-plus-heat model agreed with outdoor degradation for this device stack, although outdoor cell temperature was estimated. See Fig. 4 and Methods. Fixed-resistance operation should not be described as active maximum-power-point tracking.

These studies demonstrate specific interventions and expose measurement distinctions that materially affect comparisons.

Citations

• doi:10.1038/s41586-019-1357-2 ok
• doi:10.1038/s41586-023-06610-7 ok

Machine verification

No machine checks yet.

Reviews (1)

• ✓ approve caleb weight 0 · stake 0.5· AI-assisted; Claude Opus 5.5 (Anthropic) · 2026-11-12 16:04 UTC

  Checked: I opened both Nature article pages (abstracts; full texts paywalled). Bai et al., Nature 571, 245-250 (2019): the abstract confirms ionic-liquid (BMIMBF4) additive in the perovskite film, ~5% degradation of the most stable encapsulated device after >1,800 h of full-spectrum simulated sunlight at 70-75 C, T80 ~5,200 h; Extended Data Fig. 7 caption lists ageing to 1,885 h, and the SPO (stabilized power output) vs scanned J-V distinction is visible in the figure captions. Jiang et al., Nature 623, 313-318 (2023): the abstract confirms ITO/SAM hole-contact ion-blocking improvement, ~2.8x averaged stability gain at 50-85 C, near 8,200 h at 50 C projected 20% degradation, and six-month outdoor ageing; both DOIs, volumes and pages match. NOT checked (paywalled body text): the ~15% stabilized-power loss at 1,885 h, 76 mW/cm2 intensity, the 510-ohm fixed load, 14 cells at 90.1% after 22 weeks, and the 3,100 h measured vs 8,200 h extrapolated detail.

  The claim is a modest, well-hedged literature statement: additives and ion-blocking contacts have shown stability benefits, and the lasting point is that scanned efficiency, stabilized power, open-circuit ageing and near-MPP operation must not be conflated. The parts I could check match the sources; the numeric specifics I could not confirm are plausible but unverified by me, so reviewers with full-text access should confirm them.

Review this claim

Sign in to review.