Novel pyridoquinazolindone-containing triphenylamine dyes for dye-sensitized solar cells

• Published in: Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2023-04, Vol.438, p.114563, Article 114563
• Main Authors: Gao, Yang, Dai, Shenbin, Zhu, Jingzhi, Wu, Liang, Han, Liang, Li, Yujin, Ye, Qing, Cui, Yanhong
• Format: Article
• Language: English
• Subjects: Dye-sensitized solar cell; Photovoltaic performance; Pyridoquinazolinone; Syntheses; Triarylamine
• ISSN: 1010-6030
• DOI: 10.1016/j.jphotochem.2023.114563

Four novel “A-D-π-A” pyridoquinazolinone-containing triphenylamine dyes were synthesized. Their photophysical, electrochemical properties and photovoltaic performance were evaluated. Dye with double pyridoquinazolinone units and thiophene bridge exhibits the best photoelectric conversion efficiency 5.19%. [Display omitted] •Four pyridoquinazolinone-containing triphenylamine sensitizing dyes were synthesized.•Additional pyridoquinazolinone unit benefit the increase of Voc.•Dye with two pyridoquinazolinone units and thiophene bridge achieved the best PCE. Four novel “A-D-π-A” pyridoquinazolinone-containing triphenylamine dyes were synthesized for dye-sensitized solar cell (DSSCs), which consist of triphenylamine as the electron donor, thiophene or CC bond as π-bridge, cyanoacrylic acid as the electron acceptor and pyridoquinazolinone as the auxiliary acceptor. Their photophysical, electrochemical properties and photovoltaic performance were investigated. Moreover, density functional theory (DFT) was performed for theoretical calculations. The results show that the incorporation of additional pyridoquinazolinone unit enables dyes with larger charge recombination resistance than the dyes with single pyridoquinazolinone unit, which benefits the increase of Voc. Besides, the introduction of thiophene bridge can broaden and red-shift the absorption region, which endows the dyes with better light-harvesting ability and subsequently brings about superior IPCE and Jsc. Therefore, dye with double pyridoquinazolinone units and thiophene bridge exhibits the best photoelectric conversion efficiency 5.19 % (Jsc = 11.71 mAcm−2, Voc = 0.67 V, ff = 0.70).