| Effect of chemical structure of interface modifier of TiO2 on photovoltaic properties of poly(3-hexylthiophene)/TiO2 layered solar cells. | |
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MedLine Citation:
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PMID: 18947832 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Two classes of phosphonic acid-bearing organic molecules, 2-oligothiophene phosphonic acid and omega-(2-thienyl)alkyl phosphonic acid were adopted as interface modifiers (IMs) of the TiO(2) surface, to increase its compatibility with poly(3-hexylthiophene) (P3HT). The self-assembled monolayers of these molecules on titania surface were characterized by making contact angle measurements and X-ray photoelectron spectroscopy (XPS). Atomic force microscopic (AFM) images revealed that the adsorption of IMs effectively smooths the TiO(2) surface. Both photoluminescence (PL) spectroscopy and PL lifetime measurements were made to investigate the photoinduced properties of the TiO(2)/IM/P3HT layered-junction. The PL quenching efficiency increased with the number of thiophene rings and as the alkyl chain-length in IMs decreased. Meanwhile, the decline in the PL lifetime followed a similar trend as the PL quenching efficiency. Additionally, the power conversion efficiency (PCE) of the ITO/TiO(2)/IM/P3HT/Au devices was examined by measuring their photocurrent density-applied voltage (J-V) curves. The experimental results indicated that the short-circuit current density (J(SC)) increased with the number of thiophene units and as the hydrocarbon chain-length in IMs decreased. However, the open-circuit voltage (V(OC)) of the devices slightly fell as the energy level of the highest occupied molecular orbital (HOMO) of IM decreased. The PCE of the device with 2-terthiophene phosphonic acid was 2.5 times that of the device with 10-(2-thienyl)decyl phosphonic acid. |
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Authors:
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Chih-Wei Hsu; Leeyih Wang; Wei-Fang Su |
Publication Detail:
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Type: Journal Article Date: 2008-10-09 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: 329 ISSN: 1095-7103 ISO Abbreviation: J Colloid Interface Sci Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2008-11-12 Completed Date: 2009-01-30 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: United States |
Other Details:
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Languages: eng Pagination: 182-7 Citation Subset: - |
Affiliation:
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Institute of Polymer Science and Engineering, National Taiwan University, Taipei, 10617, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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