Effect of Donor Strength and Bulk on Thieno[3,4‐b]‐pyrazine‐Based Panchromatic Dyes in Dye‐Sensitized Solar Cells

Liyanage, Nalaka P.; Cheema, Hammad; Baumann, Alexandra; Zylstra, Alexa R.; Delcamp, Jared H.

doi:10.1002/cssc.201700546

Cited by 14 publications

(13 citation statements)

References 50 publications

(29 reference statements)

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“…[14][15][16][17] A recent trend for sensitizing Pt/TiO 2 is the use of metal-free organic dyes with strong absorptivity and panchromatic sensitization properties. [18][19][20] For example, perylene-quinoxaline, [21] porphyrin-BODIPY, [22] phenothiazine-BODIPY, [23] thienopyrazine-triarylamine, [24] or multicarbazole [25] have been developed as covalently-linked multichromophore sensitizers for Pt/TiO 2 -based catalysts to realize efficient light absorption. In this context, we recently reported a dyad sensitizer of chlorophyll derivative connected with indoline dye for panchromatic PHE.…”

mentioning

confidence: 99%

Semi‐Synthetic Chlorophyll‐Carotenoid Dyad for Dye‐Sensitized Photocatalytic Hydrogen Evolution

Liu

Chen

et al. 2021

Adv Materials Inter

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attractive and challenging researches in the field of artificial photosynthesis. [1][2][3] Photocatalytic hydrogen evolution (PHE) has been in the spotlight as it is a highly prospective approach to convert and store the solar energy into hydrogen energy efficiently to meet future global energy demand. Thus development of photocatalysis for PHE is considered to be a matter of central focus to solve the problem of energy shortage and environmental pollution. [4][5][6] PHE systems based on various kinds of semiconductors have been extensively investigated so far, [7,8] among which Pt/TiO 2 has been regarded as one of the most major photocatalysts. [9][10][11][12][13] To overcome the inherent defects of TiO 2 such as large band gap which leads to low photocatalytic efficiency, some research groups reported the development of dye-sensitized Pt/TiO 2 photocatalysts for hydrogen evolution. [14][15][16][17] A recent trend for sensitizing Pt/TiO 2 is the use of metal-free organic dyes with strong absorptivity and panchromatic sensitization properties. [18][19][20] For example, perylene-quinoxaline, [21] porphyrin-BODIPY, [22] phenothiazine-BODIPY, [23] thienopyrazine-triarylamine, [24] or multicarbazole [25] have been developed as covalently-linked multichromophore sensitizers for Pt/TiO 2 -based catalysts to realize efficient light absorption. In this context, we recently reported a dyad sensitizer of chlorophyll derivative connected with indoline dye for panchromatic PHE. [26] The high photocatalytic activity of dyad was attributed to not only an excellent A chlorin-carotenoid dyad Dyad-COOH possessing a C3 2 -carboxylic acid group and a carotenoid moiety at the terminal end of C17-substituent is synthesized from naturally occurring chlorophyll-a as a new sensitizer for photocatalytic hydrogen evolution (PHE). Under the same experimental conditions, a maximum turnover number (TON) of PHE based on Dyad-COOH/Pt/TiO 2 is much higher than those of Pt/TiO 2 -based photocatalysts sensitized by the corresponding chlorin carboxylic acid (Chl-COOH) without carotenoid side chain, sole carotenoic acid (Car-COOH), or their 1:1 (mol/mol) mixture. By coadsorbing different types of carboxylic acid, the TON of Chl-COOH is found to be increased probably due to the suppression of chlorin aggregates on the TiO 2 surface. The Dyad-COOH/Pt/TiO 2 exhibits excellent photocatalytic performance with the hydrogen evolution of 9147 µmol g −1 h −1 with TON of 425 when 43 µmol g −1 of dye is loaded on the Pt/TiO 2 catalyst, while a better TON of 556 is achieved by preparing the photocatalyst with 10 µmol g −1 of Dyad-COOH. This study provides new ideas for utilizing traditional photosynthetic dyes to a low-cost and highly-efficient photosensitizer for PHE.

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confidence: 99%

Semi‐Synthetic Chlorophyll‐Carotenoid Dyad for Dye‐Sensitized Photocatalytic Hydrogen Evolution

Liu

Chen

et al. 2021

Adv Materials Inter

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“…Addition of other donor unit like dithiafulvenyl with phenothiazine unit in the D-π-A configuration was found as helpful in improving the efficiency [159,162]. Liyanage et al [157] have achieved about 8.1% of efficiency by altering the donor and acceptor group in thieno[3,4-b]pyrazine (TPz) based dyes. This variation of the substitution groups makes a drastic change in the energy level position of the dyes and hence facilitates the efficient carrier transfer.…”

Section: Role Of Porphyrin Dyes In Co-sensitizationmentioning

confidence: 99%

Role of co-sensitization in dye-sensitized and quantum dot-sensitized solar cells

et al. 2019

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Novel materials for third generation solar cells have emerged as one of the major scientific contribution in alternative energy approaches. In this scenario, semiconductor nanomaterials and organic dye molecules have greatly acknowledged for their vast contribution to the solar energy applications. Research on semiconductor nanomaterials for fabricating future generation solar cells is still fascinating due to their extraordinary structural and optical properties. Moreover, functionalization of organic dye molecules helps to harvest large amount of photons in order to apply them for high efficiency solar cell devices. Various attempts have been made to improve efficiency of quantum dot-sensitized solar cells and dye-sensitized solar cells using semiconductor inorganic nanomaterials and organic/organometallic dye molecules. Out of these, co-sensitization has been looking as most promising approach to improve the efficiency considerably. A record of over 14% of efficiency has been achieved in recent years through co-sensitization strategy. The energy transfer process during co-sensitization is also a very crucial and interesting. This review deals about materials, methods, various approaches and role of co-sensitization in enhancing the efficiency of dye-sensitized and quantum dot sensitized solar cells. The critical issues existing in the co-sensitization approach are also elaborately discussed.

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“…To circumvent the lower Δ G inj of NL6, an analogous TPz‐based dye NL11 was fabricated using ethyl groups instead of phenyl groups on the TPz pyrazine ring. This was found to result in a raised excited‐state energy level of the dye, efficient electron injection without changing the TiO 2 CB energy, higher photovoltages, and only a 20 nm blue‐shift of the IPCE spectrum . Wang and co‐workers examined the effects of adding a thiophene spacer on both sides of the TPz building block to yield FNE32 .…”

Section: Panchromatic Sensitizers For Dsc Devicesmentioning

confidence: 99%

“…This was found to result in ar aised excitedstate energy level of the dye, efficient electron injection without changing the TiO 2 CB energy,h igher photovoltages, and only a2 0nmb lue-shift of the IPCE spectrum. [41] Wang and coworkers examined the effects of adding at hiophenes pacer on both sides of the TPz building block to yield FNE32. [42] Ar edshifted IPCE onset of 850nma nd peak value of 50 %w as obtained for FNE32 relative the NL dyes.…”

Section: Metal-free Sensitizersmentioning

confidence: 99%

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

2017

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Dye‐sensitized solar cells (DSCs) are a promising source of renewable energy. However, the power conversion efficiency (PCE) of devices has been limited largely by the difficulty of producing electricity using photons from the near‐infrared (NIR) spectral region. Metal‐free organic sensitizers frequently employ strong electron‐donating or ‐withdrawing moieties to tune the optical band gap to allow the absorption of lower energy wavelengths in charge‐transfer systems, whereas porphyrins and phthalocyanines use substituents to shift the Soret and Q bands toward lower energy absorption. Very few devices employing precious metal‐free dyes have achieved panchromatic and NIR photon conversion for electricity generation at wavelengths >750 nm despite a tremendous number of sensitizers published over the last 25 years. This Minireview seeks to compile a summary of these sensitizers to encourage assimilation, analysis, and development of efficient future sensitizers with absorption extending into the NIR. Herein, we discuss common synthetic strategies, optical properties, and electronic properties of the most successful panchromatic organic sensitizers.

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Effect of Donor Strength and Bulk on Thieno[3,4‐b]‐pyrazine‐Based Panchromatic Dyes in Dye‐Sensitized Solar Cells

Cited by 14 publications

References 50 publications

Semi‐Synthetic Chlorophyll‐Carotenoid Dyad for Dye‐Sensitized Photocatalytic Hydrogen Evolution

Semi‐Synthetic Chlorophyll‐Carotenoid Dyad for Dye‐Sensitized Photocatalytic Hydrogen Evolution

Role of co-sensitization in dye-sensitized and quantum dot-sensitized solar cells

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

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