A High‐Efficiency Panchromatic Squaraine Sensitizer for Dye‐Sensitized Solar Cells

Photoelectrochemical characterization of squaraine-sensitized nickel oxide cathodes deposited via screen-printing for p -type dye-sensitized solar cells

“…The choice of the three symmetric squaraines VG1C8, VG10C8 and DS2/35 ( Fig. 1) with their red-shifted absorption [38] with respect to the more largely used organic sensitizers of NiO cathodes [23,28,29] was motivated by the easiness of their preparation and the lower costs of purification with respect to their unsymmetrical analogues [45]. The successful employment of the squaraines VG1C8 [45] and VG10C8 [46] as sensitizers of n-type DSCs has been previously demonstrated when nanoporous TiO 2 was the electrode [47].…”

“…For the sensitization of the nanoporous NiO x cathodes prepared via screen-printing method we have considered the series of organic dyes based on the squaraines of Fig. 1 [38], This class of dyes has been previously used with success for the sensitization of NiO x [39][40][41][42], and represents a crucial node in the perspective of assembling a tandem device [23,24]. This is because the squaraines possess absorption properties which are complementary to those of the traditional organometallic [43] and organic dyes [44] used for the sensitization of n-type DSCs (with TiO 2 or ZnO working electrodes).…”

Charge transport characterization in a squaraine-based photodetector by means of admittance spectroscopy

“…(8) becomes clearly visible in a wider frequency range; in addition, since this term is up to two or three orders of magnitude larger than C g [19], it obscures all other contributions in Eq. (9), so that the capacitance can be nicely fitted according to the following relation:…”

“…Additionally, squaraine dyes find useful applications in optoelectronic devices, namely field effect transistors [7], organic photovoltaics [8], dye-sensitized solar cells [9], and organic photodetectors [10][11][12][13]. Despite the number of possible and promising applications, a complete characterization of transport properties in squaraine-based devices is still missing.…”

Effect of nature of anchoring groups on photosensitization behavior in unsymmetrical squaraine dyes

“…The dyes SQ-A and SQ-B bearing carboxylate and cyanoacrylate functionality were synthesized following the methods developed in our earlier reports [10,23]. SQ-C bearing thiophene bridged cyanoacrylate has been synthesized by modifying the method developed by Shi et al [22]. The intermediates 2,3,3-trimethyl-3H-indole-5-carboxylic acid (4a) and 3-(5-Bromo-1-butyl-3,3-dimethyl-2,3-dihydroindol-2-ylidenemethyl)-4-hydroxy cyclobut-3-ene-1,2-dione (10) were synthesized according to the reported procedures [9,24].…”