Full metadata record
DC FieldValueLanguage
dc.contributor.authorChen, Hsiu-Chengen_US
dc.contributor.authorSu, Yu-Weien_US
dc.contributor.authorWei, Kung-Hwaen_US
dc.date.accessioned2016-03-28T00:04:26Z-
dc.date.available2016-03-28T00:04:26Z-
dc.date.issued2016-01-01en_US
dc.identifier.issn2050-7488en_US
dc.identifier.urihttp://dx.doi.org/10.1039/c5ta08932hen_US
dc.identifier.urihttp://hdl.handle.net/11536/129684-
dc.description.abstractBlock copolymers can self-assemble into ordered structures having feature dimensions on the order of 10 to 100 nm; we took advantage of the different polarities of the blocks of a low-molecular-weight diblock copolymer polystyrene-b-poly(ethylene oxide) (PS-b-PEO) that interact differentially with small molecules and fullerenes to tune the extent of phase separation in solution-processed small-molecule bulk-heterojunction (SMBHJ) solar cells. We incorporated small amounts of nanostructured PS-b-PEO to solar cells\' active layers featuring 7,7\'-{4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b\']dithiophene-2,6-diyl} bis{6-fluoro-4-(5\'-hexyl-[2,2\'-bithiophen]-5-yl) benzo[c] [1,2,5]thiadiazole} (p-DTS(FBTTh2)(2)) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) for optimizing the morphology and thus enhancing the devices\' power conversion efficiency. For understanding the effect of PS-b-PEO on the devices\' performances, we used synchrotron grazing-incidence wide-angle X-ray scattering, atomic force microscopy and transmission electron microscopy to probe and to decipher the morphologies of the resulting SMBHJ thin films. Without undergoing any annealing process, a device with an active layer of p-DTS(FBTTh2)(2): PC71BM (1.5 : 1, w/w) that incorporated 0.5 wt% of PS-b-PEO and was processed with a 1,8-diiodooctane solvent additive displayed a power conversion efficiency (PCE) of 7.3%, a relative increase of 2.5 times as compared to the PCE of 2.1% for the control device featuring only p-DTS(FBTTh2)(2) and PC71BM. Thus, incorporating this nanostructured block copolymer in the active layer allowed effective tuning of the small molecule active layer morphology and resulted in enhanced device efficiency.en_US
dc.language.isoen_USen_US
dc.titleA block copolymer enhances the efficiency of small-molecule bulk-heterojunction photovoltaicsen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/c5ta08932hen_US
dc.identifier.journalJOURNAL OF MATERIALS CHEMISTRY Aen_US
dc.citation.spage2228en_US
dc.citation.epage2235en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000369568700023en_US
dc.citation.woscount0en_US
Appears in Collections:Articles