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Relevant academic research and scientific papers

Influence of a D-π-A system through a linked unit of double and triple bonds in a triarylene bridge for dye-sensitised solar cells

Herein, eight metal-free organic dyes (YH-1-YH-8) containing olefin or acetylene as π-spacer linkages in a triarylene bridge were synthesised. Moreover, two dyes (1N-PPP and 1N-PPS) without olefin and triple bonds as π-spacer linkages were used as references. The photophysical and electrochemical properties of the dyes were characterised, and the dyes were then used to fabricate dye-sensitised solar cells (DSSCs). We demonstrated the use of a D-π-A dipolar system by employing arylamine derivatives as an electron donor, triarylene with iterative olefin or acetylene as a π-bridge, and cyanoacrylic acid as an electron acceptor. YH-1 had olefin as a repeating unit in the triarylene bridge and exhibited broad absorption, favourable short-circuit photocurrent density (Jsc), and favourable open-circuit voltage (Voc) when used in a film morphology with DCA as a coabsorbent. The optimal device exhibited a Jsc of 16.23 mA cm-2, a Voc of 650 mV, and a fill factor of 0.67, corresponding to an overall conversion efficiency of 7.08%. The photophysical properties of the DSSCs were analysed using time-dependent density functional theory with the B3LYP functional.

Geometrical effect of stilbene on the performance of organic dye-sensitized solar cells

New metal-free organic donor-bridge-acceptor dyes comprising a triphenylamine moiety as the electron donor (D), a cyanoacrylic acid moiety as the electron acceptor (A), and a conjugated chromophore between D and A as a spacer (S) were synthesized for the application of dye-sensitized solar cells (DSSCs). Two types of S were designed, one contains a normal stilbene backbone (dye 1) and the other contains a 2-phenylindene moiety (dye 2) with the central double bond locked in a transoid geometry. The performance of DSSCs made with these two types of dyes was compared, and it was found that the inhibition of trans/cis isomerization of the central double bond was advantageous to the efficiency of DSSCs. The phenomenon was investigated by a comparison of their photophysical properties, and rationalized by quantum mechanical calculations by using density functional theory (DFT) at the B3LYP/6-31G(d,p) level. The electronic transitions were analyzed by time-dependent DFT, and the results were consistent with the experimental observations. The DSSCs were fabricated using both types of materials, and the performance was recorded under AM 1.5G irradiation (100 mW cm-2) condition. The overall conversion efficiencies of dye 2 (5.14-5.67%) were higher than those of dye 1 (4.52-4.98%). Both the short-circuit photocurrent density (Jsc) and the open-circuit voltage (Voc) were improved in 2 with respect to those of 1. The Royal Society of Chemistry.