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Solar cells sensitized with porphyrin dyes with a carbazole donor: The effects of an auxiliary benzothiadiazole acceptor and bulky substituents on the donor
Chinese Acad Fishery Sci, Lab Qual Safety & Proc Aquat Prod, East China Sea Fisheries Res Inst, Jungong 300, Shanghai 200090, Peoples R China..
East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China..
East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Meilong 130, Shanghai 200237, Peoples R China.;East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Meilong 130, Shanghai 200237, Peoples R China..
Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao, Shandong, Peoples R China..
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2019 (English)In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 171, article id UNSP 107776Article in journal (Refereed) Published
Abstract [en]

Three porphyrin sensitizers XW54-XW56 containing a carbazole donor have been designed and synthesized by introducing a benzothiadiazole (BTD) unit as the auxiliary electron acceptor to extend the absorption spectra and/or bulky dihexyloxyphenyl groups into the carbazole unit to suppress dye aggregation and improve the photovoltage (V-OC). The BTD unit incorporated in XW54 obviously broadens and red-shifts the absorption threshold to ca. 700 nm, as compared with that of 650 nm observed for XW1. Thus, XW54 exhibits a much broader monochromatic photon-to-electron conversion efficiency (IPCE) spectrum with an extremely red-shifted onset wavelength of 780 nm, resulting in a photocurrent density (J(SC)) of 11.60 mA cm(-2), higher than that of XW1. Unfortunately, the V-OC value was decreased owing to the more severe dye aggregation caused by the large conjugation framework induced by the presence of the BTD unit. As a result, XW54 shows an efficiency of 6.26%, slightly higher than that of 6.11% obtained for XW1. On the other hand, with the bulky dihexyloxyphenyl donor groups introduced to XW55, a highest V-OC, of 860 mV was achieved, which can be ascribed to the efficient prevention of charge recombination and suppression of dye aggregation. Thus, XW55-based cells exhibit an improved efficiency of 6.60%. On the basis of XW54 and XW55, two bulky dihexyloxyphenyl groups and a BTD unit were simultaneously introduced to XW56, affording a highest efficiency of 7.03%, with the J(SC )and V-OC, values of 12.5 mA cm(-2) and 785 mV, respectively. These results compose a novel approach for developing efficient dye-sensitized solar cells (DSSCs) by simultaneously introducing bulky dihexyloxyphenyl groups and a benzothiadiazole unit, which may synergistically broaden the absorption spectra and suppress the dye aggregation, resulting in improved photocurrent and photovoltage.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 171, article id UNSP 107776
Keywords [en]
Dye-sensitized solar cells, Porphyrin, Sensitizers, Carbazole, Bulky groups
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-260982DOI: 10.1016/j.dyepig.2019.107776ISI: 000484870700096Scopus ID: 2-s2.0-85070315073OAI: oai:DiVA.org:kth-260982DiVA, id: diva2:1357801
Note

QC 20191004

Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-16Bibliographically approved

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