Two dyes and containing triphenylamine as the donor and perylenemonoimide as the acceptor, with and without bithiophene as π-bridge, respectively, were successfully prepared and characterized for p-type dye-sensitized solar cells (p-DSSCs) and dye-sensitized photoelectrochemical cells (DS-PECs). As a result, with bithiophene π-bridge exhibited a broader absorption spectrum and a higher molar extinction coefficient than . Furthermore, the photocurrents of p-DSSCs and DS-PECs for the dye were increased by 26.9 and 32.9%, respectively, compared with those of the dye . Meanwhile, the electrochemical impedance spectroscopy of the -based p-DSSC showed the smaller charge-transfer resistance and larger hole lifetime because the longer π-bridge facilitated charge transfer and separation within the dye molecule and effectively prevented the hole recombination process at the NiO/dye interface, resulting in improvement of photoelectric performance. Hence, these results show that the π-bridge extension of dyes has a promising effect on the photocurrent improvement of p-DSSCs and DS-PECs.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6644769 | PMC |
http://dx.doi.org/10.1021/acsomega.8b01910 | DOI Listing |
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