Near-IR organic sensitizers containing squaraine and phenothiazine units for dye-sensitized solar cells

Bae, Seong Hee; Seo, Kang Deuk; Choi, Won Seok; Hong, Ji Yeoun; Kim, Hwan Kyu

doi:10.1016/j.dyepig.2014.07.031

Cited by 34 publications

(11 citation statements)

References 46 publications

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“…However, the LUMO level of SGT‐110 was only slightly more negative than the conduction band edge of TiO 2 . The low LUMO levels caused insufficient electron flow from excited dyes to the TiO 2 surface and, consequently, this led to low J sc values 19. The electron density of the HOMO and LUMO levels of the dyes are shown in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

“…However,t he LUMO level of SGT-110 was only slightly more negative than the conduction band edge of TiO 2 .T he www.chemeurj.org low LUMO levels caused insufficient electronf low from excited dyes to the TiO 2 surfacea nd,c onsequently,t his led to low J sc values. [19] The electron density of the HOMO and LUMO levels of the dyes are shown in Figure 7. The dihedrala ngles between the benzothiadiazole moiety and the donor group in SGT-109 and SGT-110 were calculated to be 3.75 and 2.048,r espectively.Ont he other hand, the dihedrala ngles between the benzothiadiazole/thiophene moiety and benzene in SGT-110 and SGT-111 were 2.11a nd 33.58,r espectively.T he structural difference was negligible for the dihedral angle between the benzothiadiazole and the donor group;h owever,t he thiophene of SGT-110 and benzene of SGT-111 caused ar emarkable difference in the dihedral angle with benzothiadiazole; SGT-109 possessed am ore tilted structure than SGT-111.A s shown in Figure 7, the shapes of the HOMO and LUMO levels for both compounds were very similar.T he electrons in the HOMO level of each compound were distributed over the entire conjugated chromophore, whereas those of LUMO level were mainly distributed over the p-bridgingm oiety.T he redshifted absorption of SGT-110 relative to that of SGT-111 could be explained in terms of effectivec onjugation.…”

Section: à2mentioning

confidence: 99%

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Organic Dyes with Well‐Defined Structures for Highly Efficient Dye‐Sensitised Solar Cells Based on a Cobalt Electrolyte

Seo

Choi

Kim

2015

Chemistry A European J

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Seven SGT organics dyes, containing bis-dimethylfluoreneyl amino groups with a dialkoxyphenyl unit as an electron donor and a cyanoacrylic acid group as an anchoring group, connected with oligothiophenes, fused thiophenes and benzothiadiazoles as π-bridges, were designed and synthesised for applications in dye-sensitised solar cells (DSSCs). The photovoltaic performance of DSSCs based on organic dyes with oligothiophenes depends on the molecular structure of the dyes, in terms of the length change of the π-bridging units. The best performance was found with a π-bridge length of about 6 Å. To further enhance the photovoltaic performance associated with this concept, cyclopenta[1,2-b:5,4-b']dithiophene (CPDT) and benzothiadiazole were introduced into the π-bridge unit. As a result, the DSSC based on the organic dye containing the CPDT moiety showed the best photovoltaic performance with a short-circuit photocurrent density (Jsc ) of 14.1 mA cm(-2) , an open-circuit voltage (Voc ) of 0.84 V and a fill factor (FF) of 0.72, corresponding to an overall conversion efficiency (η) of 8.61 % under standard AM 1.5 irradiation.

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Section: Resultsmentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Organic Dyes with Well‐Defined Structures for Highly Efficient Dye‐Sensitised Solar Cells Based on a Cobalt Electrolyte

Seo

Choi

Kim

2015

Chemistry A European J

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“…The dye proposed (YR6 [S26], see Figure 21) allowed unprecedented conversion efficiency of 6.74 % to be reached. Bae et al122 have recently reported unsymmetrical structures with increased “π‐space” between the donor group and the squaraine core [S123–126] (Figure 22).…”

Section: Structure–property Relationshipsmentioning

confidence: 95%

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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“…In spite of the efficiency of the DSSC by dye49 was just 3.9%, these outcomes affirmed that such a design strategy to join the covalent three diverse dyes is successful in improve panchromatic SQ-sensitizers. In 2011, Shi and colleagues created an asymmetric bis(indoline) SQ-sensitizer 50 for use in DSSC [46]. In this novel SQ-sensitizer structure, one thiophene unit was covalently connected to an indolium moiety which prompting the band to gain additional power absorption.…”

Section: Asymmetrical Squaraine Dyes As Sensitizersmentioning

confidence: 99%

Symmetrical and unsymmetrical squaraine sensitizers for dye-sensitized solar cells: Present day advances and future challenges

Al-horaibi

2021

Advanced Materials Proceedings

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The requirement for energy is ever increasing in the past few years due to the need for the innovation of clean energy and eco-friendly technologies. Symmetric and asymmetric SQ-dyes have received increasing attention and great potential for use as SQ-sensitizers for application in dye sensitized solar cells (DSSC).This review article gives a synopsis of the advancements on SQ-sensitizers in the domain of DSSC and the chance used to enhance their overall energy conversion efficiency. Specifically, the primary factors in charge of the low values of open-circuit voltage (Voc) short-circuit photocurrent (Jsc) and fill factor (FF) are debated in detail. Future orientations in research and expanded absorptions of nearinfrared region (NIR) by development organic substances and their applications are suggested from a personal point of view. compared to . It will be huge challenge to evolve novel SQ-sensitizers in enhancing and generation of high efficiency DSSC.

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Near-IR organic sensitizers containing squaraine and phenothiazine units for dye-sensitized solar cells

Cited by 34 publications

References 46 publications

Organic Dyes with Well‐Defined Structures for Highly Efficient Dye‐Sensitised Solar Cells Based on a Cobalt Electrolyte

Organic Dyes with Well‐Defined Structures for Highly Efficient Dye‐Sensitised Solar Cells Based on a Cobalt Electrolyte

Polymethine Dyes in Hybrid Photovoltaics: Structure–Properties Relationships

Symmetrical and unsymmetrical squaraine sensitizers for dye-sensitized solar cells: Present day advances and future challenges

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