Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 30, Pages 11782-11788Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta03740b
Keywords
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Funding
- National Natural Science Foundation of China [21371092, 21401107]
- National Basic Research Program of China [2010CB923303]
- Natural Science Foundation of Jiangsu Province, China [BK20140986]
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We prepared three new push-pull dyes JA3, JA4 and JA0 through structure optimization, and applied them in DSSCs. Judicious molecular structure optimization of dyes can significantly improve the performance of DSSCs. Spirobifluorene as a building block was introduced onto the phenothiazine donor groups. Compared to JA1, the steric effect of the spirobifluorene building block can effectively reduce charge recombination by preventing the I-3(-) of the electrolyte penetrating into the TiO2 surface, thus the V-oc of JA3 increased from 701 mV to 800 mV. In order to further improve the light-harvesting ability of the DSSC, we introduced a benzothiadiazole unit (BTD) and prepared D-A-pi-A dye JA4. As expected, the J(sc) of JA4 increased from 12.32 to 14.43 mA cm(-2) compared to that of JA3, and the device reached the highest PCE of 7.0%. Moreover, since extending the pi-conjugated system is known to decrease the V-oc of DSSC, the porphyrin unit was removed and dye JA0 was synthesized. Notably, the DSSC based on JA0 reached a very high V-oc of 840 mV and a high PCE of 6.69%: to our knowledge, this is the highest V-oc for DSSCs based on phenothiazine dyes with I-/I-3(-) electrolyte.
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