Coaxial multishell nanowires with high-quality electronic interfaces and tunable optical cavities for ultrathin photovoltaics
DC Field | Value | Language |
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dc.contributor.author | Kempa, Thomas J. | - |
dc.contributor.author | Cahoon, James F. | - |
dc.contributor.author | Kim, Sun-Kyung | - |
dc.contributor.author | Day, Robert W. | - |
dc.contributor.author | Bell, David C. | - |
dc.contributor.author | Park, Hong-Gyu | - |
dc.contributor.author | Lieber, Charles M. | - |
dc.date.accessioned | 2021-09-06T22:51:16Z | - |
dc.date.available | 2021-09-06T22:51:16Z | - |
dc.date.created | 2021-06-18 | - |
dc.date.issued | 2012-01-31 | - |
dc.identifier.issn | 0027-8424 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/109045 | - |
dc.description.abstract | Silicon nanowires (NWs) could enable low-cost and efficient photovoltaics, though their performance has been limited by nonideal electrical characteristics and an inability to tune absorption properties. We overcome these limitations through controlled synthesis of a series of polymorphic core/multishell NWs with highly crystalline, hexagonally-faceted shells, and well-defined coaxial p-type/n-type (p/n) and p/intrinsic/n (p/i/n) diode junctions. Designed 200-300 nm diameter p/i/n NW diodes exhibit ultralow leakage currents of approximately 1 fA, and open-circuit voltages and fill-factors up to 0.5 V and 73%, respectively, under one-sun illumination. Single-NW wavelength-dependent photocurrent measurements reveal size-tunable optical resonances, external quantum efficiencies greater than unity, and current densities double those for silicon films of comparable thickness. In addition, finite-difference-time-domain simulations for the measured NW structures agree quantitatively with the photocurrent measurements, and demonstrate that the optical resonances are due to Fabry-Perot and whispering-gallery cavity modes supported in the high-quality faceted nanostructures. Synthetically optimized NW devices achieve current densities of 17 mA/cm(2) and power-conversion efficiencies of 6%. Horizontal integration of multiple NWs demonstrates linear scaling of the absolute photocurrent with number of NWs, as well as retention of the high open-circuit voltages and short-circuit current densities measured for single NW devices. Notably, assembly of 2 NW elements into vertical stacks yields short-circuit current densities of 25 mA/cm(2) with a backside reflector, and simulations further show that such stacking represents an attractive approach for further enhancing performance with projected efficiencies of >15% for 1.2 mu m thick 5 NW stacks. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | NATL ACAD SCIENCES | - |
dc.subject | SILICON NANOWIRES | - |
dc.subject | SOLAR-CELLS | - |
dc.subject | ABSORPTION | - |
dc.subject | ARRAYS | - |
dc.title | Coaxial multishell nanowires with high-quality electronic interfaces and tunable optical cavities for ultrathin photovoltaics | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Park, Hong-Gyu | - |
dc.identifier.doi | 10.1073/pnas.1120415109 | - |
dc.identifier.scopusid | 2-s2.0-84863115681 | - |
dc.identifier.wosid | 000299731400022 | - |
dc.identifier.bibliographicCitation | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.109, no.5, pp.1407 - 1412 | - |
dc.relation.isPartOf | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | - |
dc.citation.title | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | - |
dc.citation.volume | 109 | - |
dc.citation.number | 5 | - |
dc.citation.startPage | 1407 | - |
dc.citation.endPage | 1412 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalWebOfScienceCategory | Multidisciplinary Sciences | - |
dc.subject.keywordPlus | SILICON NANOWIRES | - |
dc.subject.keywordPlus | SOLAR-CELLS | - |
dc.subject.keywordPlus | ABSORPTION | - |
dc.subject.keywordPlus | ARRAYS | - |
dc.subject.keywordAuthor | nanodevices | - |
dc.subject.keywordAuthor | nanomaterials | - |
dc.subject.keywordAuthor | nanophotonics | - |
dc.subject.keywordAuthor | optical nanocavities | - |
dc.subject.keywordAuthor | solar cells | - |
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