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Article: Layer-by-layer deposition of rhenium-containing hyperbranched polymers and fabrication of photovoltaic cells

TitleLayer-by-layer deposition of rhenium-containing hyperbranched polymers and fabrication of photovoltaic cells
Authors
KeywordsEnergy conversion
Hyperbranched polymers
Rhenium
Self-assembly
Thin films
Issue Date2007
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistry
Citation
Chemistry - A European Journal, 2007, v. 13 n. 1, p. 328-335 How to Cite?
AbstractMultilayer thin films were prepared by the layer-by-layer (LBL) deposition method using a rhenium-containing hyperbranched polymer and poly[2-(3-thienyl) ethoxy-4-butylsulfonate] (PTEBS). The radii of gyration of the hyperbranched polymer in solutions with different salt concentrations were measured by laser light scattering. A significant decrease in molecular size was observed when sodium trifluoromethanesulfonate was used as the electrolyte. The conditions of preparing the multilayer thin films by LBL deposition were studied. The growth of the multilayer films was monitored by absorption spectroscopy and spectroscopic ellipsometry, and the surface mor phologies of the resulting films were studied by atomic force microscopy. When the pH of a PTEBS solution was kept at 6 and in the presence of salt, polymer films with maximum thickness were obtained. The multilayer films were also fabricated into photovoltaic cells and their photocurrent responses were measured upon irradiation with simulated air mass (AM) 1.5 solar light. The open-circuit voltage, short-circuit current, fill factor, and power conversion efficiency of the devices were 1.2 V, 27.1 μ A cm -2, 0.19, and 6.1 × 10 -3%, respectively. The high open-circuit voltage was attributed to the difference in the HOMO level of the PTEBS donor and the LUMO level of the hyperbranched polymer acceptor. A plot of incident photon-to-electron conversion efficiency versus wavelength also suggests that the PTEBS/hyperbranched polymer junction is involved in the photosensitization process, in which a maximum was observed at approximately 420 nm. The relatively high capacitance, determined from the measured photocurrent rise. and decay profiles, can be attributed to the presence of large counter anions in the polymer film. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.
Persistent Identifierhttp://hdl.handle.net/10722/70450
ISSN
2015 Impact Factor: 5.771
2015 SCImago Journal Rankings: 2.323
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTse, CWen_HK
dc.contributor.authorMan, KYKen_HK
dc.contributor.authorCheng, KWen_HK
dc.contributor.authorMak, CSKen_HK
dc.contributor.authorChan, WKen_HK
dc.contributor.authorYip, CTen_HK
dc.contributor.authorLiu, ZTen_HK
dc.contributor.authorDjurišić, ABen_HK
dc.date.accessioned2010-09-06T06:23:00Z-
dc.date.available2010-09-06T06:23:00Z-
dc.date.issued2007en_HK
dc.identifier.citationChemistry - A European Journal, 2007, v. 13 n. 1, p. 328-335en_HK
dc.identifier.issn0947-6539en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70450-
dc.description.abstractMultilayer thin films were prepared by the layer-by-layer (LBL) deposition method using a rhenium-containing hyperbranched polymer and poly[2-(3-thienyl) ethoxy-4-butylsulfonate] (PTEBS). The radii of gyration of the hyperbranched polymer in solutions with different salt concentrations were measured by laser light scattering. A significant decrease in molecular size was observed when sodium trifluoromethanesulfonate was used as the electrolyte. The conditions of preparing the multilayer thin films by LBL deposition were studied. The growth of the multilayer films was monitored by absorption spectroscopy and spectroscopic ellipsometry, and the surface mor phologies of the resulting films were studied by atomic force microscopy. When the pH of a PTEBS solution was kept at 6 and in the presence of salt, polymer films with maximum thickness were obtained. The multilayer films were also fabricated into photovoltaic cells and their photocurrent responses were measured upon irradiation with simulated air mass (AM) 1.5 solar light. The open-circuit voltage, short-circuit current, fill factor, and power conversion efficiency of the devices were 1.2 V, 27.1 μ A cm -2, 0.19, and 6.1 × 10 -3%, respectively. The high open-circuit voltage was attributed to the difference in the HOMO level of the PTEBS donor and the LUMO level of the hyperbranched polymer acceptor. A plot of incident photon-to-electron conversion efficiency versus wavelength also suggests that the PTEBS/hyperbranched polymer junction is involved in the photosensitization process, in which a maximum was observed at approximately 420 nm. The relatively high capacitance, determined from the measured photocurrent rise. and decay profiles, can be attributed to the presence of large counter anions in the polymer film. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.en_HK
dc.languageengen_HK
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/chemistryen_HK
dc.relation.ispartofChemistry - A European Journalen_HK
dc.subjectEnergy conversionen_HK
dc.subjectHyperbranched polymersen_HK
dc.subjectRheniumen_HK
dc.subjectSelf-assemblyen_HK
dc.subjectThin filmsen_HK
dc.titleLayer-by-layer deposition of rhenium-containing hyperbranched polymers and fabrication of photovoltaic cellsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0947-6539&volume=13&spage=328&epage=335&date=2007&atitle=Layer-by-layer+deposition+of+rhenium-containing+hyperbranched+polymers+and+fabrication+of+photovoltaic+cellsen_HK
dc.identifier.emailMak, CSK: cskm@hkucc.hku.hken_HK
dc.identifier.emailChan, WK: waichan@hku.hken_HK
dc.identifier.emailDjurišić, AB: dalek@hku.hken_HK
dc.identifier.authorityMak, CSK=rp00761en_HK
dc.identifier.authorityChan, WK=rp00667en_HK
dc.identifier.authorityDjurišić, AB=rp00690en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1002/chem.200600838en_HK
dc.identifier.pmid17013959-
dc.identifier.scopuseid_2-s2.0-33845928053en_HK
dc.identifier.hkuros125992en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33845928053&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume13en_HK
dc.identifier.issue1en_HK
dc.identifier.spage328en_HK
dc.identifier.epage335en_HK
dc.identifier.eissn1521-3765-
dc.identifier.isiWOS:000244231500032-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridTse, CW=8264696700en_HK
dc.identifier.scopusauthoridMan, KYK=8051698900en_HK
dc.identifier.scopusauthoridCheng, KW=36439221300en_HK
dc.identifier.scopusauthoridMak, CSK=8899597100en_HK
dc.identifier.scopusauthoridChan, WK=13310083000en_HK
dc.identifier.scopusauthoridYip, CT=14043063100en_HK
dc.identifier.scopusauthoridLiu, ZT=22934686400en_HK
dc.identifier.scopusauthoridDjurišić, AB=7004904830en_HK

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