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dc.contributor.authorChen, Hsiu-Chengen_US
dc.contributor.authorLin, Shu-Weien_US
dc.contributor.authorJiang, Jian-Mingen_US
dc.contributor.authorSu, Yu-Weien_US
dc.contributor.authorWei, Kung-Hwaen_US
dc.date.accessioned2015-07-21T08:29:28Z-
dc.date.available2015-07-21T08:29:28Z-
dc.date.issued2015-03-25en_US
dc.identifier.issn1944-8244en_US
dc.identifier.urihttp://dx.doi.org/10.1021/acsami.5b00521en_US
dc.identifier.urihttp://hdl.handle.net/11536/124496-
dc.description.abstractIn this study, we employed polyethylenimine-doped sol-gel-processed zinc oxide composites (ZnO:PEI) as efficient electron transport layers (ETL) for facilitating electron extraction in inverted polymer solar cells. Using ultraviolet photoelectron spectroscopy, synchrotron grazing-incidence small-angle X-ray scattering and transmission electron microscopy, we observed that ZnO:PEI composite films\' energy bands could be tuned considerably by varying the content of PEI up to 7 wt %-the conduction band ranged from 4.32 to 4.0 eV-and the structural order of ZnO in the ZnO:PEI thin films would be enhanced to align perpendicular to the ITO electrode, particularly at 7 wt % PEI, facilitating electron transport vertically. We then prepared two types of bulk heterojunction systems-based on poly(3-hexylthiophene) (P3HT):phenyl-C-61-butryric acid methyl ester (PC61BM) and benzo[1,2-b:4,5-b]dithiophene-thiophene-2,1,3-benzooxadiazole (PBDTTBO):phenyl-C-71-butryric acid methyl ester (PC71BM)-that incorporated the ZnO:PEI composite layers. When using a composite of ZnO:PEI (93:7, w/w) as the ETL, the power conversion efficiency (PCE) of the P3HT:PC61BM (1:1, w/w) device improved to 4.6% from a value of 3.7% for the corresponding device that incorporated pristine ZnO as the ETL-a relative increase of 24%. For the PBDTTBO:PC71BM (1:2, w/w) device featuring the same amount of PEI blended in the ETL, the PCE improved to 8.7% from a value of 7.3% for the corresponding device that featured pure ZnO as its ETL-a relative increase of 20%. Accordingly, ZnO:PEI composites can be effective ETLs within organic photovoltaics.en_US
dc.language.isoen_USen_US
dc.subjectphotovoltaicsen_US
dc.subjectconduction banden_US
dc.subjectzinc oxide: polyethylenimine nanocompositesen_US
dc.subjectelectron transport layeren_US
dc.subjectgrazing-incidence small-angle X-ray scatteringen_US
dc.titleSolution-Processed Zinc Oxide/Polyethylenimine Nanocomposites as Tunable Electron Transport Layers for Highly Efficient Bulk Heterojunction Polymer Solar Cellsen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/acsami.5b00521en_US
dc.identifier.journalACS APPLIED MATERIALS & INTERFACESen_US
dc.citation.issue11en_US
dc.citation.spage6273en_US
dc.citation.epage6281en_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:000351972400034en_US
dc.citation.woscount1en_US
Appears in Collections:Articles