Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 391, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2019.112333
Keywords
Dye-sensitized solar cells; 9-(p-tolyl)-2,3,4,4a,9,9a-hezahydro-1H-carbazole; Power conversion efficiency; 2,1,3-Benzochalcogenadiazoles
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Funding
- Russian Science Foundation [15-13-10022]
- JASSO
- Russian Science Foundation [15-13-10022] Funding Source: Russian Science Foundation
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The novel donor building-block - 9-(p-tolyl)-2,3,4,4a,9,9a-hexahydro-1H-carbazole was designed and employed in the synthesis of dye-sensitized solar cell (DSSCs). An effective, high-yielding synthesis of 4,6-(4,4,5,5-tetramethy1-1,3,2-dioxaborolan-2-yl)-9-(p-tolyl)-1,2,3,4,4a,9a-hexahydrocarbazole from 1,2,3,4,4a,9a-hexahydrocarbazole was realized. Three new metal-free organic sensitizers, containing the new donor building block were prepared by a stepwise approach from 4,7-dibromobenzo[c][1,2,5]chacogenadiazoles. A 2,1,3-Benzothiadiazole dye containing hexahydrocarbazole donor, thiophene as pi-spacer and cyanoacrylate as anchoring electron acceptor showed photovoltaic properties higher than the well-known WS-2 sensitizer with PCE = 5.86 %. Although benzoxa- and -selenadiazole dyes have a bathochromic shift (24 - 30 nm) in the UV-vis spectra, and smaller energy gap E-g (about 0.1 eV), they have lower photovoltaic parameters, including PCE of 1.5-2.3 %. Introducing a new donor 9-(p-tolyl)-2,3,4,4a,9,9a-hexahydro-1H-carbazole into the construction of the DSSCs has broadened possibilities for the optimization of their photovoltaic properties.
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