Organic dyes incorporating low-band-gap chromophores based on π-extended benzothiadiazole for dye-sensitized solar cells |
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| Authors: | Dong Hyun Lee Myung Jun Lee Hae Min Song Bok Joo Song Kang Deuk Seo Mariachiara Pastore Chiara Anselmi Simona Fantacci Filippo De Angelis Mohammad K Nazeeruddin Michael Gretzel Hwan Kyu Kim |
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| Affiliation: | a Department of Advanced Materials Chemistry & Center for Advanced Photovoltaic Materials (ITRC), Korea University, ChungNam 339-700, Republic of Korea;b Istituto CNR di Scienze e Tecnologie Molecolari c/o Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, I-06123 Perugia, Italy;c Italian Institute of Technology (IIT), Center for Biomolecular Nanotechnologies, Via Barsanti 73010, Arnesano, Lecce, Italy;d Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Federale de Lausanne, 1015 Lausanne, Switzerland |
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| Abstract: | A series of new π-conjugated organic dyes (HKK-BTZ1, HKK-BTZ2, HKK-BTZ3 and HKK-BTZ4), comprising triphenylamine (TPA) moieties as the electron donor and benzothiadiazole moieties as the electron acceptor/anchoring groups, was synthesized for the use in dye-sensitized solar cells (DSSCs). TPA units are bridged to benzothiadiazole with single(S), double(D) and triple bonds(T) in different derivatives. And HKK-BTZ1 was modified by introducing alkoxy group of TPA unit, because the bulky alkoxy group is a strong donating group for the more red shift and for reducing aggregation of dyes in TiO2 film. The structure-property relationship was investigated. Under standard global AM 1.5 G illumination, a maximum photo-to-electron conversion efficiency of 7.30% was achieved with the DSSC based on dye HKK-BTZ4 (JSC = 17.9 mA/cm?2, VOC = 0.62 V, FF = 0.66), while the Ru dye N719-sensitized DSSC showed an efficiency of 7.82% with a JSC of 17.5 mA/cm?2, a VOC of 0.62 V, and a FF of 0.72. |
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| Keywords: | Metal-free organic dyes Low band-gap chromophore Benzothiadiazole unit Triphenylamine (TPA) unit π -Bridge units Dye-sensitized solar cells |
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