Molecular Engineering of Quinoxaline-Based D–A−π–A Organic Sensitizers: Taking the Merits of a Large and Rigid Auxiliary Acceptor
Citations Over TimeTop 16% of 2018 papers
Abstract
The continuing efforts of creating novel D-A-π-A structured organic sensitizers with excellent optoelectronic properties have resulted in substantial improvement of power conversion efficiency (PCE) as well as stability of dye-sensitized solar cells (DSSCs). Here, we report a new molecular engineering strategy for enhancing optical gain and improving excited-state features in D-A-π-A structured organic sensitizers by improving the conjugation size and rigidity of the auxiliary acceptor functional group. A series of phenanthrene-fused-quinoxaline (PFQ)-based D-A-π-A organic sensitizers (WS-82, WS-83, and WS-84) are designed and synthesized for applications in DSSCs. Compared to 2,3-diphenylquinoxaline (DPQ)-based dye IQ-4, PFQ dyes show extended absorption spectra and improved open-circuit voltage performance. Upon a systematical engineering of alkyl chains and π-spacer structure, the unfavorable issues of PFQ dyes including low solubility and high energy barrier in intramolecular charge transition are successfully eliminated. When applied in iodine electrolyte-based DSSCs, the best performing PFQ dye WS-84 shows a PCE of 10.11%, which is much higher than that of our previous champion DPQ dye IQ-4 under the same conditions.
Related Papers
- → The impressive effect of eco-friendly carbon dots on improving the performance of dye-sensitized solar cells(2019)61 cited
- → Enhanced dye illumination in dye-sensitized solar cells using TiO2/GeO2photo-anodes(2014)51 cited
- → Synthesis and performance of new quinoxaline-based dyes for dye sensitized solar cell(2015)46 cited
- → Modification of TiO2 Nanowire Arrays with Sn Doping as Photoanode for Highly Efficient Dye-Sensitized Solar Cells(2019)24 cited
- → Impact of the architecture of dye sensitized solar cell-powered electrochromic devices on their photovoltaic performance and the ability to color change(2019)21 cited