Alkyl and fluoro-alkyl substituted squaraine dyes: A prospective approach towards development of novel NIR sensitizers

Pandey, Shyam S.; Inoue, Takafumi; Fujikawa, Naotaka; Yamaguchi, Yoshihiro; Hayase, Shuzi

doi:10.1016/j.tsf.2010.08.045

Cited by 50 publications

(29 citation statements)

References 26 publications

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“…Also in 2010, Pandey et al observed better performances with alkyl and fluoro‐alkyl unsymmetrical squaraine dyes. In particular, a symmetrical dye, coded SQ‐A84 or SQ‐385 (or SQ‐186) [S43], showed lower photocurrent and efficiency when directly compared with its monoanchored analogous (SQ‐D84 or SQ‐485 [S18]) (Figure 8). The conclusion was that the attachment of an anchoring group in the aromatic ring and the creation of an unsymmetrical molecule facilitate the effective electron injection from photoexcited dye to the conduction band of TiO 2 , because of the unidirectional charge flows, enhancing photovoltaic performance.…”

Section: Structure–property Relationshipsmentioning

confidence: 99%

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

et al. 2016

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Polymethine dyes as photosensitizers for dye‐sensitized solar cells (DSCs) are reviewed. The review provides a summary of design strategies, the main synthetic routes, and the optical and photovoltaic properties of polymethine dyes applied in hybrid photovoltaics. In particular, we focus on cyanine and squaraine dyes and their structure–properties relationships, highlighting the role of the active molecule design on device performance.

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Section: Structure–property Relationshipsmentioning

confidence: 99%

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

et al. 2016

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“…Pandey et al systematically studied the structure-property relationships of symmetrical and unsymmetrical squaraine dyes by incorporating different alkyl and fluorinated-alkyl substituents. [21] Under the same measurement conditions, cells based on unsymmetrical squaraines 30 and 31 afforded higher h values than those of 27, 28, and 29. The efficiency obtained with 31 (3.36 %) is slightly larger than the one with 30 (3.08 %) due to the use of longer chain substituents, which effectively suppressed H-aggregation between sensitizers.…”

Section: Unsymmetrical Squaraine Dyesmentioning

confidence: 85%

“…Based on the above results, Otsuka et al further modified the structure of unsymmetrical squaraine dyes by synthesizing three dyes (20)(21)(22), and applied them in nanocrystalline ZnO-based solar cells. [16] By introducing long alkyl chains into the indolium moiety, the H-aggregation of dye 22 was largely suppressed, thereby resulting in a higher IPCE than that of the solar cell based on 20.…”

Section: Unsymmetrical Squaraine Dyesmentioning

confidence: 99%

Squaraine Dyes for Dye‐Sensitized Solar Cells: Recent Advances and Future Challenges

Qin

Wong

2013

Chemistry An Asian Journal

118

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In the past few years, squaraine dyes have received increasing attention as a sensitizer for application in dye-sensitized solar cells. This class of dyes not only leaves open a good opportunity to afford conventional high performance dyes but also holds great promise for applications in transparent solar cells due to its low absorption intensity in the eye-sensitive region. This review provides a summary of the developments on squaraine dyes in the field of dye-sensitized solar cells and the opportunities used to improve their overall energy conversion efficiency. In particular, the main factors responsible for the low values of open-circuit voltage, short-circuit photocurrent and fill factor are discussed in detail. Future directions in research and development of near-infrared (NIR) organic materials and their applications are proposed from a personal perspective.

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“…Squaric acid based symmetrical squaraine dye (SQ-2) and unsymmetrical squaraine dyes (SQ-8), SQ-41, SQ-54 and SQ-64 used in the present study have been synthesized following the methodology adopted by Oswald et al [24]. Detailed synthesis and characterization for the dyes SQ-2, SQ-8 and SQ-41 can be found in our earlier publications [25][26]. Synthesis of unsymmetrical squaraine dyes SQ-54 and SQ-64 was conducted as per the scheme-1.…”

Section: Synthesis Of Squaraine Dyes and Their Intermediatesmentioning

confidence: 99%

Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye-sensitized solar cells

et al. 2011

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Creation of molecular asymmetry in the organic sensitizing dyes has been demonstrated for enhancing the photoconversion efficiency due to unidirectional flow of electron after the photoexcitation. Molecular structures for direct indole ring carboxy-functionalized unsymmetrical squaraine dyes have been optimized by fine tuning the molecular structures and judicious selection of the substituents to prevent the dye aggregation and electron recombination. Best efficiency of 4.42 % was achieved for unsymmetrical squaraine dye SQ-64 with a short circuit current density of 11.22 mA/cm2, a fill factor of 0.61 and an open circuit voltage of 0.64 V under standard AM 1.5 simulated solar irradiation.

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Alkyl and fluoro-alkyl substituted squaraine dyes: A prospective approach towards development of novel NIR sensitizers

Cited by 50 publications

References 26 publications

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Squaraine Dyes for Dye‐Sensitized Solar Cells: Recent Advances and Future Challenges

Fine tuning the structure of unsymmetrical squaraine dyes towards the development of efficient dye-sensitized solar cells

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