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Lee, Chang Young
Carbon Nanomaterials Lab
Research Interests
  • Carbon nanomaterials, gas sensors, neuroanalytical chemistry, biomimetic nanosystems

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Evidence for High-Efficiency Exciton Dissociation at Polymer/Single-Walled Carbon Nanotube Interfaces in Planar Nano-heterojunction Photovoltaics

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dc.contributor.author Ham, Moon-Ho ko
dc.contributor.author Paulus, Geraldine L. C. ko
dc.contributor.author Lee, Chang Young ko
dc.contributor.author Song, Changsik ko
dc.contributor.author Kalantar-zadeh, Kourosh ko
dc.contributor.author Choi, Wonjoon ko
dc.contributor.author Han, Jae-Hee ko
dc.contributor.author Strano, Michael S. ko
dc.date.available 2015-07-23T02:11:14Z -
dc.date.created 2015-07-22 ko
dc.date.issued 2010-10 -
dc.identifier.citation ACS NANO, v.4, no.10, pp.6251 - 6259 ko
dc.identifier.issn 1936-0851 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12306 -
dc.identifier.uri http://pubs.acs.org/doi/pdf/10.1021/nn1019384 ko
dc.description.abstract There is significant interest in combining carbon nanotubes with semiconducting polymers for photovoltaic applications because of potential advantages from smaller exciton transport lengths and enhanced charge separation. However, to date, bulk heterojunction (BM) devices have demonstrated relatively poor efficiencies, and little is understood about the polymer/nanotube junction. To investigate this interface, we fabricate a planar nano-heterojunction comprising well-isolated millimeter-long single-walled carbon nanotubes underneath a poly(3-hexylthiophene) (P3HT) layer. The resulting junctions display photovoltaic efficiencies per nanotube ranging from 3% to 3.82%, which exceed those of polymer/nanotube BM by a factor of 50-100. The increase is attributed to the absence of aggregate formation in this planar device geometry. It is shown that the polymer/nanotube interface itself is responsible for exciton dissociation. Typical open-circuit voltages are near 0.5 V with All factors of 0.25-0.3, which are largely invariant with the number of nanotubes per device and P3HT thickness. A maximum efficiency is obtained for a 60 nm-thick P3HT layer, which is predicted by a Monte Carlo simulation that takes into account exciton generation, transport, recombination, and dissociation. This platform is promising for further understanding the potential role of polymer/nanotube interfaces for photovoltaic applications ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject single-walled carbon nanotubes ko
dc.subject polymer hybrid solar cells ko
dc.subject organic photovoltaics ko
dc.subject well-aligned carbon nanotubes ko
dc.subject n-doping of carbon nanotubes ko
dc.subject Monte Carlo modeling ko
dc.subject exciton diffusion ko
dc.title Evidence for High-Efficiency Exciton Dissociation at Polymer/Single-Walled Carbon Nanotube Interfaces in Planar Nano-heterojunction Photovoltaics ko
dc.title.alternative Evidence for High-Efficiency Exciton Dissociation at Polymer/Single-Walled Carbon Nanotube Interfaces in Planar Nano-heterojunction Photovoltaics ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-78049341225 ko
dc.identifier.wosid 000283453700099 ko
dc.type.rims ART ko
dc.description.wostc 54 *
dc.description.scopustc 56 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1021/nn1019384 ko
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