DC Field | Value | Language |
---|---|---|
dc.contributor.author | Cho, Jin-Woo | ko |
dc.contributor.author | Lee, Kyun-Jun | ko |
dc.contributor.author | Lee, Tae-Il | ko |
dc.contributor.author | Kim, Young-Bin | ko |
dc.contributor.author | Choi, Dae-Geun | ko |
dc.contributor.author | Nam, Youngsuk | ko |
dc.contributor.author | Kim, Sun-Kyung | ko |
dc.date.accessioned | 2021-06-25T04:50:08Z | - |
dc.date.available | 2021-06-25T04:50:08Z | - |
dc.date.created | 2021-06-25 | - |
dc.date.created | 2021-06-25 | - |
dc.date.issued | 2019-10 | - |
dc.identifier.citation | NANO LETTERS, v.19, no.10, pp.7093 - 7099 | - |
dc.identifier.issn | 1530-6984 | - |
dc.identifier.uri | http://hdl.handle.net/10203/286216 | - |
dc.description.abstract | Tailoring the spectrum of thermal radiation at high temperatures is a central issue in the study of thermal radiation harnessed energy resources. Although bulk metals with periodic cavities incorporated into their surfaces provide high emissivity, they require a complicated micron metal etch, thereby precluding reliable, continuous operation. Here, we report thermally stable, highly emissive, ultrathin (<20 nm) tungsten (W) radiators that were prepared in a scalable and cost-effective route. Alumina/W/alumina multiwalled, submicron cavity arrays were fabricated sequentially using nanoimprinting lithography, thin film deposition, and calcination processes. To highlight the practical importance of high-temperature radiators, we developed a thermophotovoltaic (TPV) system equipped with fabricated W radiators and low-bandgap GaSb photovoltaic cells. The TPV system produced electric power reliably during repeated temperature cycling between 500 and 1200 K; the power density at 1200 K was fixed to be approximately 1.0 W/cm(2). The temperature-dependent electric power was quantitatively reproduced using a one-dimensional energy conversion model. The symmetric configuration of alumina/W/alumina multiwall together with the presence of a void inside each cavity alleviated thermal stress, which was responsible for the stable TPV performance. The short-current-density (J(sc)) of developed TPV system was augmented significantly by decreasing the W thickness below its skin depth. A 17 nm thick W radiator yielded a 32% enhancement in J(sc) compared to a 123 nm thick W radiator. Electromagnetic analysis indicated that subskin-depth W cavity arrays led to suppressed surface reflection due to the mitigated screening effect of free electrons, thereby enhancing the absorption of light within each W wall. Such optical tunneling-mediated absorption or radiation was valid for any metal material and morphology (e.g., planar or patterned). | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | Optical Tunneling Mediated Sub-Skin-Depth High Emissivity Tungsten Radiators | - |
dc.type | Article | - |
dc.identifier.wosid | 000490353500048 | - |
dc.identifier.scopusid | 2-s2.0-85072697976 | - |
dc.type.rims | ART | - |
dc.citation.volume | 19 | - |
dc.citation.issue | 10 | - |
dc.citation.beginningpage | 7093 | - |
dc.citation.endingpage | 7099 | - |
dc.citation.publicationname | NANO LETTERS | - |
dc.identifier.doi | 10.1021/acs.nanolett.9b02585 | - |
dc.contributor.localauthor | Nam, Youngsuk | - |
dc.contributor.nonIdAuthor | Cho, Jin-Woo | - |
dc.contributor.nonIdAuthor | Lee, Kyun-Jun | - |
dc.contributor.nonIdAuthor | Lee, Tae-Il | - |
dc.contributor.nonIdAuthor | Kim, Young-Bin | - |
dc.contributor.nonIdAuthor | Choi, Dae-Geun | - |
dc.contributor.nonIdAuthor | Kim, Sun-Kyung | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Optical tunneling | - |
dc.subject.keywordAuthor | thermal radiation | - |
dc.subject.keywordAuthor | spectrum engineering | - |
dc.subject.keywordAuthor | radiative heat transfer | - |
dc.subject.keywordAuthor | thermophotovoltaics | - |
dc.subject.keywordPlus | PHOTONIC CRYSTALS | - |
dc.subject.keywordPlus | ABSORBERS | - |
dc.subject.keywordPlus | GENERATION | - |
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