Using a glass spacer instead of a vacuum in a thermophotovoltaic device doubles power density breaking Planck’s law

https://scitechdaily.com/scientists-just-doubled-power-output-by-breaking-a-thermal-limit/

"compact, scalable, cleaner, cheaper harnessing wasted heat for electricity without requiring extreme temperatures... zero-vacuum gap between thermal source/ solar cell: insulated, high index/ IR-transparent glass spacer createsing high power density... operates at 1,000°C, yields power equivalent to 1,400°C... even more power using amorphous silicon, potentially nearly 20X more increase... integrates into existing commercial processes...  manufacturing, portable power generators, renewable energy storage"

Related: Rethinking Carnot: Scientists overcome traditional power-efficiency trade-off
https://phys.org/news/2025-01-rethinking-carnot-scientists-traditional-power.html#google_vignette