Tuning optical absorption in pyran derivatives for DSSC

Design‐to‐Device Approach Affords Panchromatic Co‐Sensitized Solar Cells

“…From here, we manually evaluated each dye and considered practical constraints such as ease of synthesis or availability. This afforded a set of five dyes for experimental validation: C1, [33] 8c, [34] XS6, [35] 15, [36] and H3. [37] Figure 2 provides the 2D and 3D chemical structures of the dyes, with molecular dimensions annotated as a reference for the surface characterization work discussed later.…”

Novel pyran based dyes for application in dye sensitized solar cells

“…Table 1. By comparing HOMO levels between the dyes here described and similar dyes previously reported, characterized by carbazole donor moieties rather than phenothiazine groups [12], it is interesting to notice that dyes P 1 , P 2 and P 3 are characterized by a less stable HOMO level: it is possible to rationalize this behaviour as the consequence of the stronger donor ability featured by phenothiazine as compared to carbazole, that eventually results in an easier oxidability for the former. All the measured values are anyway much lower than the oxidation potential of the redox couple I -/I 3 -(-4.8 eV), generally used in DSSC devices, so that sensitizer regeneration during DSSC operation could occur with good efficiency.…”

“…As shown in previous works reported in the literature, the use of functionalizing group with different electron acceptor strength on the same molecular fragment results in the tuning of the optical absorption properties of the dyes so that different parts of the visible spectrum can be covered [12,21,22]. The pyran core is symmetrically linked to phenothiazine groups; phenothiazine is a heteroaromatic system characterized by a strong electron donor ability as a consequence of the presence of electron rich nitrogen and sulfur atoms contained in it.…”

“…Pyran based chromophores have been in fact reported as interesting compounds in different fields of organic electronics and photonics: they found application as red emitting dyes in OLED technology [1,2] and showed significant photovoltaic activity [3,4]; pyran derivatives endowing second order nonlinear optical activity [5], and two photon absorption properties [6][7][8][9], have also been reported in the literature. In the last years, the use of this class of compounds as photosensitizers in dye sensitized solar cells (DSSC) has shown encouraging results [10][11][12].…”

A new biologically active molecular scaffold: crystal structure of 7-(3-hydroxyphenyl)-4-methyl-2H-[1,2,4]triazolo[3,2-c][1,2,4]triazole and selective antiproliferative activity of three isomeric triazolo–triazoles

“…Heterocycles, and particularly nitrogen-rich heterocycles, are key compounds in modern materials chemistry, and they are used as building blocks of active molecules in many fields of advanced materials, for example, conducting polymers (Heeger, 2010), organic field-effect transistors (Miao, 2014), organic solar cells (Nielsen et al, 2015;Maglione et al, 2016), liquid crystals (Centore et al, 1996), nonlinear optically active compounds (Carella et al, 2007;Centore et al, 1999), photoluminescent metal-organic complexes (Argeri et al, 2014) and high-energy compounds (Klapö tke et al, 2015).…”