Efficient low-temperature thermophotovoltaic emitters from metallic photonic crystals

Prashant Nagpal, Sang Eon Han, Andreas Stein, David J. Norris

Research output: Contribution to journalArticlepeer-review

120 Scopus citations


We examine the use of metallic photonic crystals as thermophotovoltaic emitters. We coat silica woodpile structures, created using direct laser writing, with tungsten or molybdenum. Optical reflectivity and thermal emission measurements near 650 °C demonstrate that the resulting structures should provide efficient emitters at relatively low temperatures. When matched to InGaAsSb photocells, our structures should generate over ten times more power than solid emitters while having an optical-to-electrical conversion efficiency above 32%. At such low temperatures, these emitters have promise not only in solar energy but also in harnessing geothermal and industrial waste heat.

Original languageEnglish (US)
Pages (from-to)3238-3243
Number of pages6
JournalNano letters
Issue number10
StatePublished - Oct 2008


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