Symmetric vs. asymmetric squaraines as photosensitisers in mesoscopic injection solar cells: a structure–property relationship study
作者:Jinhyung Park、Claudia Barolo、Frédéric Sauvage、Nadia Barbero、Caterina Benzi、Pierluigi Quagliotto、Salvatore Coluccia、Davide Di Censo、Michael Grätzel、Md. K. Nazeeruddin、Guido Viscardi
DOI:10.1039/c2cc17187b
日期:——
A symmetric squaraine and its related non-symmetric structure are shown to have comparable efficiencies in DSCs, but with undoubtedly advantages in the low cost and easiness of synthesis for the symmetrical structure.
Near‐Infrared Squaraine Dyes as Bright Fluorescent Probes: A Structure–Activity Photophysical Investigation in Liposomes
作者:Giacomo Renno、Francesca Cardano、Viktoria Ilieva、Guido Viscardi、Andrea Fin
DOI:10.1002/ejoc.202200833
日期:2022.10.7
unsymmetrical red emitting squaraine dyes is reported, varying the substituents to modulate the hydrophilic/hydrophobic ratio of the fluorescentprobes. Their ability to stain cellular membranes is assessed by studying their interactions with liposomal model systems, screening the key features for the design of squaraine-based cell membrane probes.
Synthesis and characterization of squaric acid based NIR dyes for their application towards dye-sensitized solar cells
作者:Takafumi Inoue、Shyam S. Pandey、Naotaka Fujikawa、Yoshihiro Yamaguchi、Shuji Hayase
DOI:10.1016/j.jphotochem.2010.04.015
日期:2010.6
Synthesis of novel cyan-colored sensitizing dyes bearing squaric acid core and 2,3,3-trimethyl-indole as terminal moieties has been conducted in order to fabricate dye-sensitized solar cells based on nanoporous TiO2. It has been found that position of COOH functionality utilized for anchoring with TiO2 surface has a marked effect on solar cell performance. Carboxylic acid group directly substituted to indole ring gave about 5-fold higher conversion efficiency as compared to the dye when it was substituted in alkyl chain of the indole ring. Efficiency has been found to be hampered due to aggregation and enhancement in the efficiency was observed when dyes were used with chenodeoxycholic acid (CDCA). Using COCA and long alkyl substituent at the N-position of indole ring to prevent aggregation and enhanced TiO2 surface passivation, respectively, has achieved a solar conversion efficiency of 3.15% with a short circuit current density of 7.26 mA/cm(2), an open circuit voltage of 0.64 V and a fill factor of 0.68 for SQ-5 under standard AM 1.5 solar irradiation. (C) 2010 Elsevier B.V. All rights reserved.
Substituent effect in direct ring functionalized squaraine dyes on near infra-red sensitization of nanocrystalline TiO2 for molecular photovoltaics
作者:Shyam S. Pandey、Takafumi Inoue、Naotaka Fujikawa、Yoshihiro Yamaguchi、Shuji Hayase
DOI:10.1016/j.jphotochem.2010.07.010
日期:2010.8
We have synthesized a series of novel blue colored symmetrical squaraine sensitizers with variable alkyl chain length for their application towards the fabrication of dye-sensitized solar cells (DSSCs). It has been found that an increase in the alkyl chain length substituted at N-position of indole ring exhibits enhanced electron diffusion length and electron life-time resulting in better passivation of nanocrystalline TiO2 surface leading to enhancement in the cell performance. Based on HOMO and LUMO energy measurement of squaraine dyes, it has been demonstrated that about 0.16 eV energy barrier is sufficient for electron injection from LUMO of dye to TiO2 conduction band and dye regeneration after photo-excitation. Performances of DSSCs using model squaraine dyes indicate that dodecyl alkyl substituent is optimum giving highest Voc and use of chenodeoxycholic acid along with the dye SQ-4 shows a photoconversion efficiency of 3.5% under AM 1.5 irradiation. (C) 2010 Elsevier B.V. All rights reserved.
Microwave-Assisted Synthesis of Near-Infrared Fluorescent Indole-Based Squaraines
A microwave-assisted method for the preparation of a wide color range of 2,3,3-trimethylindolenine-based squaraines and their intermediates is described. This practical approach allows the rapid preparation of both symmetrical and nonsymmetrical Squaraine dyes, reducing reaction time from days to minutes with more than 2-fold improvement in product yields when compared to,conventional methods.