Synthesis and properties of organic sensitizers bearing asymmetric double donor -π- acceptor chains for dye-sensitized solar cells. (February 2018)

• Record Type: Journal Article
• Authors: Wei, Huaixin; Shen, Jinghua; Liu, Yajing; Huang, Tian; Zhang, Qiang; Zhao, Jie; Zhao, Xin
• Is Part Of: Dyes and pigments. Volume 149(2018)
• Page Start: 789
• Page End: 795
• Publication Date: 2018-02
• Subjects: Dye-sensitized solar cells -- D-π-A structures -- Metal-free -- Asymmetric double; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.11.042
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A novel efficient metal-free sensitizer CVTC-H-CVTP containing asymmetric double D-π-A chains was designed and synthesized for application in dye-sensitized solar cells (DSSCs). The photophysical and electrochemical properties of the target molecule were investigated systematically through comparison of dyes with different single D-π-A structures. In contrast, the sensitizer CVTC-H-CVTP provides improved Jsc and Voc because of wider range of spectral absorption and higher absorption intensity which leads to better photoelectricity conversion efficiency. Therefore, dye with asymmetric double D-π-A shows the most efficient photoelectricity conversion efficiency of 3.20% (Unoptimized, VOC = 0.66 V, JSC = 6.51 mA/cm 2, and FF = 74.72%) under simulated AM 1.5 irradiation (100 mW/cm 2 ). Graphical abstract: A novel efficient metal-free sensitizer CVTC-H-CVTP containing asymmetric double D-π-A chains was designed and synthesized for application in dye-sensitized solar cells (DSSCs). Highlights: A molecule was constructed with phenothiazine as donor, thiophen as π-conjugated unit, cyanoacetate as end-capped unit. The molecule CVTC-H-CVTP with asymmetric double D-π-A structures can increase the light absorption. With enlarged absorption, CVTC-H-CVTP based devices show more than two times than single D-π-A structure.