Fine tuning of the photovoltaic properties of triarylethylene-bridged dyes by altering the position and proportion of phenyl/thienyl groups. (December 2020)

• Record Type: Journal Article
• Authors: Yan, Yi-Qiao; Zhu, Yi-Zhou; Han, Jun; Dai, Pan-Pan; Yan, Mao; Zheng, Jian-Yu
• Is Part Of: Dyes and pigments. Volume 183(2020)
• Publication Date: 2020-12
• Subjects: Dye-sensitized solar cells -- Triarylethylene -- Thiophene -- Aggregation-induced emission; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2020.108630
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Four triarylethylene (TAE) π-spacers have been applied for Y-shaped dyes in dye-sensitized solar cells (DSSCs) and their effects on photovoltaic performance have been fully investigated. All photosensitizers inherit the ability of three-dimensional TAE to weaken the π-π stacking in aggregation state, while their suppression on charge recombination in electrolytes presents a high reliance on the position and proportion of phenyl/thienyl groups embedded in TAE moieties. In iodine electrolytes, benzene-rich triphenylethene-based dye JY65 achieves the best open-circuit voltage of 739 mV, sharply higher than that of 614 mV for trithienylethene (TTE)-based dye JY63 . Moreover, dyes JY64 and D-1 with hetero-TAE-bridge tend to show better power convention efficiency (PCE) stemming from the higher short-circuit current density and moderate open-circuit voltage. Whereas in cobalt electrolytes, the TTE-bridged JY63 attains a superior PCE of 5.84%, inversely surpassing the value of 5.28% based on D-1 under the same condition. Therefore, tuning the TAE skeletons via altering the position and proportion of aryl groups in it would bring in a promising design for anti-stacking sensitizers to meet the varied demand in DSSCs. Graphical abstract: Image 1 Highlights: Effect of TAE-spacer on photovoltaic performance has been systematically explored. All the TAE-based dyes show capability to weaken the π-π stacking in aggregation. In iodine electrolytes, benzene-blended TAE-based dyes exhibit better performance. In cobalt electrolytes, thiophene-rich JY63 inversely achieves superior PCE.