Enhanced Photocurrent via π-Bridge Extension of Perylenemonoimide-Based Dyes for p-Type Dye-Sensitized Solar Cells and Photoelectrochemical Cells.

ACS Omega

Key Laboratory for Advanced Materials, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China.

Published: October 2018

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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6644769PMC
http://dx.doi.org/10.1021/acsomega.8b01910DOI Listing

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