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김진영

Kim, Jin Young
Next Generation Energy Lab.
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dc.citation.endPage 55953 -
dc.citation.number 50 -
dc.citation.startPage 55945 -
dc.citation.title ACS APPLIED MATERIALS & INTERFACES -
dc.citation.volume 12 -
dc.contributor.author Lee, Tack Ho -
dc.contributor.author Park, Song Yi -
dc.contributor.author Du, Xiaoyan -
dc.contributor.author Park, Sujung -
dc.contributor.author Zhang, Kaicheng -
dc.contributor.author Li, Ning -
dc.contributor.author Cho, Shinuk -
dc.contributor.author Brabec, Christoph J. -
dc.contributor.author Kim, Jin Young -
dc.date.accessioned 2023-12-21T16:37:43Z -
dc.date.available 2023-12-21T16:37:43Z -
dc.date.created 2021-02-23 -
dc.date.issued 2020-12 -
dc.description.abstract We investigate the photovoltaic characteristics of organic solar cells (OSCs) for two distinctly different nanostructures, by comparing the charge carrier dynamics for bilayer- and bulk-heterojunction OSCs. Most interestingly, both architectures exhibit fairly similar power conversion efficiencies (PCEs), reflecting a comparable critical domain size for charge generation and charge recombination. Although this is, at first hand, surprising, a detailed analysis points out the similarity between these two concepts. A bulk-heterojunction architecture arranges the charge generating domains in a 3D ensemble across the whole bulk, while bilayer architectures arrange the specific domains on top of each other, rather than sharp bilayers. Specifically, for the polymer PBDB-T-2F, we find that the enhanced charge generation in a bulk composite is partially compensated by reduced recombination in the bilayer architecture, when nonfullerene acceptors (NFAs) are used instead of a fullerene acceptor. Overall, we demonstrate that bilayer-heterojunction OSCs with NFAs can reach competitive PCEs compared to the corresponding bulk-heterojunction OSCs because of reduced nonradiative open-circuit voltage losses, and suppressed trap-assisted recombination, as a result of a vertically separated donor-to-acceptor nanostructure. In contrast, the bilayer-heterojunction OSCs with the fullerene acceptor exhibited poor photovoltaic characteristics compared to the corresponding bulk devices because of highly aggregated acceptor molecules on top of the polymer donor. Although free carrier generation is reduced in a in a bilayer-heterojunction, because of reduced donor/acceptor interfaces and a limited exciton diffusion length, more favorable transport pathways for unipolar charge collection can partially compensate the aforementioned disadvantages. We propose that the unique properties of NFAs may open a technical venue for the bilayer-heterojunction as a great and easy alternative to the bulk heterojunction. -
dc.identifier.bibliographicCitation ACS APPLIED MATERIALS & INTERFACES, v.12, no.50, pp.55945 - 55953 -
dc.identifier.doi 10.1021/acsami.0c16854 -
dc.identifier.issn 1944-8244 -
dc.identifier.scopusid 2-s2.0-85097788891 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/50048 -
dc.identifier.url https://pubs.acs.org/doi/10.1021/acsami.0c16854 -
dc.identifier.wosid 000600202300038 -
dc.language 영어 -
dc.publisher American Chemical Society -
dc.title Effects on Photovoltaic Characteristics by Organic Bilayer- and Bulk-Heterojunctions: Energy Losses, Carrier Recombination and Generation -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Nanoscience & Nanotechnology; Materials Science, Multidisciplinary -
dc.relation.journalResearchArea Science & Technology - Other Topics; Materials Science -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor organic nanostructure -
dc.subject.keywordAuthor energy loss -
dc.subject.keywordAuthor carrier behavior -
dc.subject.keywordAuthor nonfullerene small molecular acceptor -
dc.subject.keywordAuthor organic solar cell -
dc.subject.keywordPlus POLYMER SOLAR-CELLS -
dc.subject.keywordPlus CHARGE-TRANSFER STATES -
dc.subject.keywordPlus EFFICIENCY -
dc.subject.keywordPlus DIFFUSION -

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