Tuning Light Absorption in Core/Shell Silicon Nanowire Photovoltaic Devices through Morphological Design
DC Field | Value | Language |
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dc.contributor.author | Kim, Sun-Kyung | - |
dc.contributor.author | Day, Robert W. | - |
dc.contributor.author | Cahoon, James F. | - |
dc.contributor.author | Kempa, Thomas J. | - |
dc.contributor.author | Song, Kyung-Deok | - |
dc.contributor.author | Park, Hong-Gyu | - |
dc.contributor.author | Lieber, Charles M. | - |
dc.date.accessioned | 2021-09-06T15:55:44Z | - |
dc.date.available | 2021-09-06T15:55:44Z | - |
dc.date.created | 2021-06-18 | - |
dc.date.issued | 2012-09 | - |
dc.identifier.issn | 1530-6984 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/107522 | - |
dc.description.abstract | Subwavelength diameter semiconductor nanowires can support optical resonances with anomalously large absorption cross sections, and thus tailoring these resonances to specific frequencies could enable a number of nanophotonic applications. Here, we report the design and synthesis of core/shell p-type/intrinsic/n-type (p/i/n) Si nanowires (NWs) with different sizes and cross-sectional morphologies as well as measurement and simulation of photocurrent spectra from single-NW devices fabricated from these NW building blocks. Approximately hexagonal cross-section p/i/n coaxial NWs of various diameters (170-380 nm) were controllably synthesized by changing the Au catalyst diameter, which determines core diameter, as well as shell deposition time, which determines shell thickness. Measured polarization-resolved photocurrent spectra exhibit well-defined diameter-dependent peaks. The corresponding external quantum efficiency (EQE) spectra calculated from these data show good quantitative agreement with finite-difference time-domain (FDTD) simulations and allow assignment of the observed peaks to Fabry-Perot, whispering-gallery, and complex high-order resonant absorption modes. This comparison revealed a systematic red-shift of equivalent modes as a function of increasing NW diameter and a progressive increase in the number of resonances. In addition, tuning shell synthetic conditions to enable enhanced growth on select facets yielded NWs with approximately rectangular cross sections; analysis of transmission electron microscopy and scanning electron microscopy images demonstrate that growth of the n-type shell at 860 degrees C in the presence of phosphine leads to enhanced relative Si growth rates on the four {113} facets. Notably, polarization-resolved photocurrent spectra demonstrate that at longer wavelengths the rectangular cross-section NWs have narrow and significantly larger amplitude peaks with respect to similar size hexagonal NWs. A rectangular NW with a diameter of 260 nm yields a dominant mode centered at 570 nm with near-unity EQE in the transverse-electric polarized spectrum. Quantitative comparisons with FDTD simulations demonstrate that these new peaks arise from cavity modes with high symmetry that conform to the cross-sectional morphology of the rectangular NW, resulting in low optical loss of the mode. The ability to modulate absorption with changes in nanoscale morphology by controlled synthesis represents a promising route for developing new photovoltaic and optoelectronic devices. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | SINGLE | - |
dc.subject | GROWTH | - |
dc.subject | SI | - |
dc.title | Tuning Light Absorption in Core/Shell Silicon Nanowire Photovoltaic Devices through Morphological Design | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Park, Hong-Gyu | - |
dc.identifier.doi | 10.1021/nl302578z | - |
dc.identifier.scopusid | 2-s2.0-84866326372 | - |
dc.identifier.wosid | 000308576000092 | - |
dc.identifier.bibliographicCitation | NANO LETTERS, v.12, no.9, pp.4971 - 4976 | - |
dc.relation.isPartOf | NANO LETTERS | - |
dc.citation.title | NANO LETTERS | - |
dc.citation.volume | 12 | - |
dc.citation.number | 9 | - |
dc.citation.startPage | 4971 | - |
dc.citation.endPage | 4976 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Physics | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.subject.keywordPlus | SINGLE | - |
dc.subject.keywordPlus | GROWTH | - |
dc.subject.keywordPlus | SI | - |
dc.subject.keywordAuthor | Facet-selective growth | - |
dc.subject.keywordAuthor | solar energy | - |
dc.subject.keywordAuthor | nanoelectronic device | - |
dc.subject.keywordAuthor | coaxial p/i/n nanostructure | - |
dc.subject.keywordAuthor | FDTD simulations | - |
dc.subject.keywordAuthor | optical resonances | - |
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