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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Spectroscopically tracking charge separation in polymer : fullerene blends with a three-phase morphology

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dc.contributor.author Gallaher, Joseph K. ko
dc.contributor.author Prasad, Shyamal K. K. ko
dc.contributor.author Uddin, Mohammad A. ko
dc.contributor.author Kim, Taehyo ko
dc.contributor.author Kim, Jin Young ko
dc.contributor.author Woo, Han Young ko
dc.contributor.author Hodgkiss, Justin M. ko
dc.date.available 2015-09-24T05:30:31Z -
dc.date.created 2015-09-24 ko
dc.date.issued 2015-07 ko
dc.identifier.citation ENERGY & ENVIRONMENTAL SCIENCE, v.8, no.9, pp.2713 - 2724 ko
dc.identifier.issn 1754-5692 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/17121 -
dc.description.abstract The coexistence of intermixed amorphous polymer : fullerene phases alongside pure semicrystalline polymer and fullerene phases provides a plausible explanation for effective charge separation in organic photovoltaic blends by providing a cascaded energy landscape. We sought to test this proposal by spectroscopically tracking charge dynamics in 3-phase blends compared with binary counterparts and linking these dynamics to free charge yields. Our study applies broadband transient absorption spectroscopy to a series of closely related alternating thiophene-benzothiadiazole copolymers in which the tuned curvature of the polymer backbone controls the nature and degree of polymer-fullerene intermixing. Free charge generation is most efficient in the 3-phase morphology that features intimately mixed polymer : PCBM regions amongst neat polymer and PCBM phases. TA spectral dynamics and polarization anisotropy measurements reveal the sub-nanosecond migration of holes from intermixed to pure polymer regions of such blends. In contrast, 2-phase blends lack the spectral dynamics of this charge migration process and suffer from severe geminate recombination losses. These results provide valuable spectroscopic evidence for an efficient charge separation pathway that relies on the 3-phase morphology ko
dc.description.statementofresponsibility close -
dc.language 영어 ko
dc.publisher ROYAL SOC CHEMISTRY ko
dc.title Spectroscopically tracking charge separation in polymer : fullerene blends with a three-phase morphology ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84940534894 ko
dc.identifier.wosid 000360456600017 ko
dc.type.rims ART ko
dc.description.wostc 0 *
dc.description.scopustc 0 *
dc.description.scopustc 0 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1039/c5ee01713k ko
dc.identifier.url http://pubs.rsc.org/en/Content/ArticleLanding/2015/EE/C5EE01713K#!divAbstract ko
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