Mechanically robust and high-performance ternary solar cells combining the merits of all-polymer and fullerene blends

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dc.contributor.authorLee, Wonhoko
dc.contributor.authorKim, Jae Hanko
dc.contributor.authorKim, Taesuko
dc.contributor.authorKim, Seonhako
dc.contributor.authorLee, Changyeonko
dc.contributor.authorKim, Jin-Seongko
dc.contributor.authorAhn, Hyungjuko
dc.contributor.authorKim, Taek-Sooko
dc.contributor.authorKim, Bumjoon J.ko
dc.date.accessioned2018-04-24T06:34:45Z-
dc.date.available2018-04-24T06:34:45Z-
dc.date.created2018-04-18-
dc.date.created2018-04-18-
dc.date.created2018-04-18-
dc.date.issued2018-03-
dc.identifier.citationJOURNAL OF MATERIALS CHEMISTRY A, v.6, no.10, pp.4494 - 4503-
dc.identifier.issn2050-7488-
dc.identifier.urihttp://hdl.handle.net/10203/241441-
dc.description.abstractIn this study, we demonstrate that the introduction of small amounts of phenyl-C-71-butyric acid methyl ester (PC71BM) into all-polymer solar cells (all-PSCs) increases the photovoltaic performance without compromising mechanical properties. Ternary blend polymer solar cells (ternary-PSCs) consisting of a polymer donor (PTB7-Th) and an acceptor mixture with different weight ratios of a polymeric acceptor (P(NDI2HD-T2)) and PC71BM demonstrate the effects of PC71BM loading on the power conversion efficiency (PCE) and mechanical properties. A significant enhancement in the PCEs of ternary-PSCs, from 6.32% to 7.33%, is observed when PC71BM is added into the active layer as up to 30 wt% of the acceptor mixture. Importantly, the excellent mechanical properties (i.e., crack onset strain = 11.6%, toughness 1/4 2237 J m(-3)) of the blend films are well preserved at PC71BM loadings at or below 30 wt%. In contrast, both the PCE and the mechanical performance of the ternary-PSCs significantly decrease at higher PC71BM loadings (> 50 wt%). Detailed morphological analysis via grazing incidence X-ray scattering measurements reveals that PC71BM molecules are well-dispersed in the amorphous portion of the active layer at PC71BM loadings up to 30 wt%. Therefore, both the mechanical and photovoltaic performances of the ternary-PSCs correlate closely with their morphological behavior, particularly in terms of the mixing behavior of PC71BM with polymers. The well-dispersed PC71BM molecules in the amorphous polymer domains facilitate efficient exciton dissociation, whereas the formation of PC71BM aggregates above a critical concentration causes severe mechanical degradation of the ternary-PSCs due to the presence of weak interfaces between the brittle PC71BM and polymer domains. Therefore, the ternary blends with optimal content of polymer/fullerene acceptors represent important candidates for flexible and wearable solar cells that require both high mechanical and photovoltaic performances.-
dc.languageEnglish-
dc.publisherROYAL SOC CHEMISTRY-
dc.subjectPOWER CONVERSION EFFICIENCY-
dc.subjectPHOTOVOLTAIC CELLS-
dc.subjectORGANIC PHOTOVOLTAICS-
dc.subjectMOLECULAR-ORIENTATION-
dc.subjectELECTRON-ACCEPTORS-
dc.subjectDEVICE PERFORMANCE-
dc.subjectMORPHOLOGY CONTROL-
dc.subjectTHERMAL-STABILITY-
dc.subjectCHARGE SEPARATION-
dc.subjectMIXING BEHAVIOR-
dc.titleMechanically robust and high-performance ternary solar cells combining the merits of all-polymer and fullerene blends-
dc.typeArticle-
dc.identifier.wosid000428847300029-
dc.identifier.scopusid2-s2.0-85043359953-
dc.type.rimsART-
dc.citation.volume6-
dc.citation.issue10-
dc.citation.beginningpage4494-
dc.citation.endingpage4503-
dc.citation.publicationnameJOURNAL OF MATERIALS CHEMISTRY A-
dc.identifier.doi10.1039/c7ta11382j-
dc.contributor.localauthorKim, Taek-Soo-
dc.contributor.localauthorKim, Bumjoon J.-
dc.contributor.nonIdAuthorKim, Seonha-
dc.contributor.nonIdAuthorAhn, Hyungju-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordPlusPOWER CONVERSION EFFICIENCY-
dc.subject.keywordPlusPHOTOVOLTAIC CELLS-
dc.subject.keywordPlusORGANIC PHOTOVOLTAICS-
dc.subject.keywordPlusMOLECULAR-ORIENTATION-
dc.subject.keywordPlusELECTRON-ACCEPTORS-
dc.subject.keywordPlusDEVICE PERFORMANCE-
dc.subject.keywordPlusMORPHOLOGY CONTROL-
dc.subject.keywordPlusTHERMAL-STABILITY-
dc.subject.keywordPlusCHARGE SEPARATION-
dc.subject.keywordPlusMIXING BEHAVIOR-
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