Substituent effect in direct ring functionalized squaraine dyes on near infra-red sensitization of nanocrystalline TiO2 for molecular photovoltaics

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

doi:10.1016/j.jphotochem.2010.07.010

Cited by 57 publications

(43 citation statements)

References 28 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: 94%

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: 94%

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

et al. 2016

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“…Regioregular P3HT with regioregularity >98% was purchased from Sigma–Aldrich USA (M n = 45–50 kg mol −1 ). Symmetrical squaraine dye (SQ‐36) was synthesized from 1‐octyl‐2,3,3‐trimethyl‐benzoindole and squaric acid by the methods previously reported by our group , Product was finally purified by silica‐gel column chromatography and characterized by high‐performance liquid chromatography (for purity), fast ion bombardment mass spectroscopy and nuclear magnetic resonance spectroscopy. The energies of the highest occupied molecular orbital (HOMO) for the P3HT and SQ‐36 were estimated from photoelectron spectroscopy in air (model AC3, Riken, Japan) while the energy of the lowest unoccupied molecular orbital (LUMO) was calculated using the relation LUMO = HOMO + E g , where, E g is the energy bandgap estimated from the onset of the optical absorption.…”

Section: Methodsmentioning

confidence: 99%

Single-step fabrication of all-solid dye-sensitized solar cells using solution-processable precursor

Das

Yamashita

Ogomi

et al. 2013

Phys. Status Solidi A

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A one‐pot, solution‐processable fabrication method of dye‐sensitized bulk heterojunction solar cell is employed to provide an alternate and analogous fabrication perspective for all‐solid dye‐sensitized solar cells (DSSCs) in a single step. All‐solid DSSCs of ZnO/dye/polythiophene derivative (P3HT) are fabricated from a soluble precursor solution of diethylzinc (DEZ), dye and P3HT. Owing to its air and moisture sensitivity, DEZ is decomposed on P3HT layer to form bicontinuous structures of ZnO and P3HT between which dyes are sandwiched. The photoaction spectrum of all‐solid DSSC shows that it covered wavelengths up to 750 nm, leading to the conclusion that panchromatic photon harvesting and electron collection are possible due to the synergistic photon harvesting by both the P3HT and the dye sensitizer. ZnO/dye/P3HT interfaces of all‐solid DSSC solar cells prepared by a single‐step fabrication process.

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“…It has been considered with particular attention to some organic dyes having complementary spectral response in the red with respect to the ruthenium-based dyes (largely used for standard DSC), such as squaraine (SQ1) (Clifford et al, 2004), cyanine (Pandey et al, 2010), phthalocyanine (Ono et al, 2009), hemicyanine (Cid et al, 2007). Indeed in other studies the co-sensibilization approach has shown high device performances toward red and violet as well in the electromagnetic spectrum (Yao et al, 2003;Kuang et al, 2007;Yum et al, 2007Yum et al, , 2008Clifford et al, 2004).…”

Section: Co-sensitizationmentioning

confidence: 99%