Abstract
AbstractA donor‐acceptor‐π‐acceptor (D‐A‐π‐A)‐type organic dye (DTN‐1) incorporating a pyrido[3,4‐b]pyrazine (PP) unit with the pyridyl N atom adjacent to the anchoring group has been synthesized for use in dye‐sensitized solar cells (DSSCs). The maximum absorption wavelength of DTN‐1 was clearly red‐shifted compared with dye DT‐1, based on PP unit with the pyridyl N atom adjacent to the donor group. However, this change of structure has a negative effect on photovoltaic performances, and devices made with DTN‐1 only reached a power conversion efficiency of 6.10 % under AM1.5G irradiation compared with 8.57 % achieved by DT‐1. Density functional theory calculations suggest that DTN‐1 has a smaller oscillator strength, which is connected to its relatively low light‐harvesting efficiency. In addition, the results of electrochemical impedance spectroscopy (EIS) reveal that charge recombination in DSSCs based on DTN‐1 is more than that in the counterpart DT‐1, thus leading to a lower open‐circuit voltage (Voc).
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