期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 435, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.114300
关键词
Adsorption energy; Coumarin; DSSCs; Molecular electrostatic potentials; ?-conjugated acceptor
In this study, the potential suitability of four thiophene-linked coumarin dyes in dye-sensitized solar cells (DSSCs) has been investigated using density functional theory (DFT) and time-dependent DFT methods. The results showed that the presence of pi-conjugated acceptor moieties enhanced the intensity of the intramolecular charge transfer band, leading to better photovoltaic performance and absorption properties for the C3 dye. Therefore, C3 dye holds potential for application in DSSCs.
Herein we studied the potential suitability of four thiophene-linked coumarin dyes in dye-sensitized solar cells (DSSCs) application by employing density functional theory (DFT) and time-dependent DFT methods. The new four dyes comprise various pi-conjugated acceptor moieties, such as quinazolinone-N-acetic acid, indoline car-boxylic acid, rhodanine acetic acid, and homophthalimide-N-acetic acid with dialkylamino coumarin as donor and thiophene as a common spacer. We have investigated the influence of the pi-conjugated acceptor moieties in thiophene-linked coumarin dyes on the photovoltaic performance and adsorption onto the TiO2 surface. The pi-conjugation in the acceptor moiety enhanced the intensity of the intramolecular charge transfer band and which has been corroborated by the natural bond orbital analysis. C3 dye showed higher charge separation (Delta qD-A) between the coumarin donor and rhodanine acetic acid acceptor moieties and which revealed a higher red-shift in the absorption spectra for C3 dye. The photophysical, electrochemical properties and photovoltaic parameters of DSSCs have been calculated to assess their suitability for the application in DSSCs. The higher dye regeneration driving force, higher lifetime, and higher power conversion efficiency values (calculated) make dye C3 the potential candidate for DSSCs among all the studied dyes.
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