A new class of triphenylamine-based novel sensitizers for DSSCs: a comparative study of three different anchoring groups. (14th June 2018)

• Record Type: Journal Article
• Authors: Patil, Dinesh; Jadhav, Manoj; Avhad, Kiran; Chowdhury, Towhid H.; Islam, Ashraful; Bedja, Idriss; Sekar, Nagaiyan
• Is Part Of: New journal of chemistry. Volume 42:Number 14(2018)
• Page Start: 11555
• Page End: 11564
• Publication Date: 2018-06-14
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj01029c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Triphenylamine-based dyes with chloro groups suitably placed on their π-linkers affect DSSC efficiency. Abstract : In this paper, we report a new class of triphenylamine-based sensitizers with different anchoring groups to rationalize the effects of the anchoring group on the power conversion efficiencies (PCE) of these sensitizers in dye sensitized solar cells (DSSCs). The photophysical properties of theTPACA, TPARN andTPASA sensitizers were recorded in acetonitrile solvent. DSSCs based on TiO2 photoanodes were fabricated using these dyes. ATPACA chromophore-based DSSC containing triphenylamine as a donor group and cyanoacetic acid as an anchoring group connected by a π-linkage produced a maximum power conversion efficiency of 5.8%, a short circuit current J sc = 11.92 mA cm −2, an open circuit voltage V oc = 0.702 V and a fill factor FF = 0.716. This enhanced efficiency of theTPACA chromophore-based DSSC is attributed to the presence of a strong electron withdrawing cyanoacetic acid anchoring group. The electron transfer kinetics was investigated by transient absorption spectroscopy (TAS). All three chromophores, TPACA, TPARN, andTPASA, were extensively studied using density functional theory (DFT) and time dependent density functional theory (TD-DFT) to correlate the effects of the anchoring modifications with their absorptions and photoconversion efficiencies.