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Article: Lending Triarylphosphine Oxide to Phenanthroline: a Facile Approach to High-Performance Organic Small-Molecule Cathode Interfacial Material for Organic Photovoltaics utilizing Air-Stable Cathodes

TitleLending Triarylphosphine Oxide to Phenanthroline: a Facile Approach to High-Performance Organic Small-Molecule Cathode Interfacial Material for Organic Photovoltaics utilizing Air-Stable Cathodes
Authors
Issue Date2014
Citation
Advanced Functional Materials, 2014, v. 24, p. 6540-6547 How to Cite?
AbstractCathode interfacial material (CIM) is critical to improving the power conversion efficiency (PCE) and long-term stability of an organic photovoltaic cell that utilizes a high work function cathode. In this contribution, a novel CIM is reported through an effective and yet simple combination of triarylphosphine oxide with a 1,10-phenanthrolinyl unit. The resulting CIM possesses easy synthesis and purification, a high T g of 116 °C and attractive electron-transport properties. The characterization of photovoltaic devices involving Ag or Al cathodes shows that this thermally deposited interlayer can considerably improve the PCE, due largely to a simultaneous increase in V oc and FF relative to the reference devices without a CIM. Notably, a PCE of 7.51% is obtained for the CIM/Ag device utilizing the active layer PTB7:PC71BM, which far exceeds that of the reference Ag device and compares well to that of the Ca/Al device. The PCE is further increased to 8.56% for the CIM/Al device (with J sc = 16.81 mA cm−2, V oc = 0.75 V, FF = 0.68). Ultraviolet photoemission spectroscopy studies reveal that this promising CIM can significantly lower the work function of the Ag metal as well as ITO and HOPG, and facilitate electron extraction in OPV devices
Persistent Identifierhttp://hdl.handle.net/10722/216962

 

DC FieldValueLanguage
dc.contributor.authorTAN, WY-
dc.contributor.authorWANG, R-
dc.contributor.authorLI, M-
dc.contributor.authorLIU, G-
dc.contributor.authorCHEN, P-
dc.contributor.authorLI, XC-
dc.contributor.authorLU, SM-
dc.contributor.authorZHU, HL-
dc.contributor.authorPENG, QM-
dc.contributor.authorZHU, XH-
dc.contributor.authorCHEN, W-
dc.contributor.authorChoy, WCH-
dc.contributor.authorLI, F-
dc.contributor.authorPENG, J-
dc.contributor.authorCAO, Y-
dc.date.accessioned2015-09-18T05:44:20Z-
dc.date.available2015-09-18T05:44:20Z-
dc.date.issued2014-
dc.identifier.citationAdvanced Functional Materials, 2014, v. 24, p. 6540-6547-
dc.identifier.urihttp://hdl.handle.net/10722/216962-
dc.description.abstractCathode interfacial material (CIM) is critical to improving the power conversion efficiency (PCE) and long-term stability of an organic photovoltaic cell that utilizes a high work function cathode. In this contribution, a novel CIM is reported through an effective and yet simple combination of triarylphosphine oxide with a 1,10-phenanthrolinyl unit. The resulting CIM possesses easy synthesis and purification, a high T g of 116 °C and attractive electron-transport properties. The characterization of photovoltaic devices involving Ag or Al cathodes shows that this thermally deposited interlayer can considerably improve the PCE, due largely to a simultaneous increase in V oc and FF relative to the reference devices without a CIM. Notably, a PCE of 7.51% is obtained for the CIM/Ag device utilizing the active layer PTB7:PC71BM, which far exceeds that of the reference Ag device and compares well to that of the Ca/Al device. The PCE is further increased to 8.56% for the CIM/Al device (with J sc = 16.81 mA cm−2, V oc = 0.75 V, FF = 0.68). Ultraviolet photoemission spectroscopy studies reveal that this promising CIM can significantly lower the work function of the Ag metal as well as ITO and HOPG, and facilitate electron extraction in OPV devices-
dc.languageeng-
dc.relation.ispartofAdvanced Functional Materials-
dc.titleLending Triarylphosphine Oxide to Phenanthroline: a Facile Approach to High-Performance Organic Small-Molecule Cathode Interfacial Material for Organic Photovoltaics utilizing Air-Stable Cathodes-
dc.typeArticle-
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hk-
dc.identifier.authorityChoy, WCH=rp00218-
dc.identifier.doi10.1002/adfm.201401685-
dc.identifier.hkuros250906-
dc.identifier.volume24-
dc.identifier.spage6540-
dc.identifier.epage6547-

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