Optical, spectral and photovoltaic characterization of natural dyes extracted from leaves of Peltophorum pterocarpum and Acalypha amentacea used as sensitizers for ZnO based dye sensitized solar cells

Sanjay, P.; Deepa, K.; Madhavan, J.; Senthil, S.

doi:10.1016/j.optmat.2018.06.011

Cited by 44 publications

(12 citation statements)

References 32 publications

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“…To tackle this first phase, we have used different vegetable raw material: pollen, coffee grains, beetroot, bougainvillea bracts with different colors, and eggplant peels, all of them easily available. Solvent influence on natural dye extraction has been dealt with previously [21][22][23]42]. In our case, after a previous sequence of tests with different solvents and procedures, four simple and economical extraction methods have been selected using HCl, acetone, water and ethanol.…”

Section: Dyes Preparation and Characterizationmentioning

confidence: 99%

“…In general, when working with anthocyanins, alcoholic solvents are used [23,35,[49][50][51][52][53][54]. For example, anthocyanin extracts from five fruits were studied by Teoli and coworkers [54].…”

Section: Flavonoidsmentioning

confidence: 99%

“…Further purification, combinations, analysis, and use constitute the body of the studies, together with new ideas about cell implementation. Researches have focused on the influence of different factors on the final performance, such as: solvent for extraction and adsorption [21][22][23], extraction time [18], pH and temperature during dye adsorption onto the nanoporous film [24], dipping time [25], dye mixing or co-sensitization [26][27][28], together with "tandem" cells [28], film thickness [22,29] etc. Some papers include also theoretical calculations or simulations [24,30,31], for example, adsorption isotherms of a dye onto TiO 2 film are fitted by models established through statistical physics treatment [24] or chlorophyll is used as a reference dye to simulate absorption spectra and theoretically calculate ground and excited state properties [30].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

García-Salinas

Ariza

2019

Applied Sciences

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We present a study about the sensitizers extracted from natural resources. This paper focuses on how to select, extract and characterize natural dyes, giving some guides to establish a protocol for the whole process of fabricating and using these dyes. The influence of the extraction solvent and method, and of parameters such as pH are analyzed. Also, dye precursor and dye extract stability have been studied, as well as how the dye adsorbs onto substrates and the effect of mixing or concentrating the extracts. Results concerning betalain pigments present in bougainvillea and beetroot extracts, and anthocyanins in eggplant extracts, analyzed by using UV-Vis spectrometry, are included. As an example of application, we report procedures intended to test and enhance the dye potential as a main component of dye-sensitized solar cells (DSSCs). DSSCs mimic nature’s photosynthesis and have some advantages like an easy and low-cost fabrication procedure. Their efficiency depends on its design and fabrication process and also on the different components involved. Hence, optimizing each component is essential to achieve the best performance, and thus the dye used as a sensitizer is crucial. We fabricate cells by using a simple procedure: As the interest is focused on the sensitizer, the same consecutive steps are followed, varying only the dye extract. Among all the natural-dyes tested, beetroot extract reaches up to 0.47% cell efficiency, which is near the highest values found in literature for this pigment.

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Section: Dyes Preparation and Characterizationmentioning

confidence: 99%

Section: Flavonoidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

García-Salinas

Ariza

2019

Applied Sciences

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“…Natural dye is relatively abundant. It can reduce the use of noble metals and has large absorption coefficients in the visible region [15], which has triggered much attention in the latest research in the field of DSSCs.…”

Section: Introductionmentioning

confidence: 99%

Light Harvesting and Optical-Electronic Properties of Two Quercitin and Rutin Natural Dyes

Zhao

et al. 2019

Applied Sciences

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The photovoltaic properties of two dyes (quercitin (Q) and rutin (R)) were experimentally investigated. The results showed that Q had excellent photoelectric properties with J s c of 5.480 mA·cm−2, V o c of 0.582 V, η of 2.151% larger than R with J s c of 1.826 mA·cm−2, V o c of 0.547 V, and η of 0.713%. For a better understanding of the photoelectric properties of two molecules and illustrating why the performances of Q is better than R from the micro-level, the UV-VIs spectrum, Fourier transforms infrared (FT-IR) spectrum, and cyclic voltage current characteristics were experimentally investigated. What is more, density functional theory (DFT) and time dependent density functional theory (TD-DFT) have been implemented in theoretical calculation. Based on the calculated results, frontier molecular orbitals (FMOs), charge differential density (CDD), infrared vibration, first hyperpolarizability, projected density orbital analysis (PDOS), electrostatic potential (ESP), and natural bond orbital (NBO) were analyzed. Hole/electron reorganization energies ( λ h / λ e ), light harvesting efficiency (LHE), fluorescent lifetime (τ), absorption peak, and the vertical dipole moment ( μ n o r m a l ) were calculated, and the shift of conduction band edge of a semiconductor (ΔECB) has been analyzed, which has a close relationship with J s c and V o c . The results demonstrated that, due to the higher LHE, τ, μ n o r m a l , and red-shifted absorption peak, Q has better photoelectric properties than R as a promising sensitizer.

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“…One possibility to increase the efficiency of DSSCs based on natural dyes is co-sensitizing, i.e., mixing two or more different dyes. While mixing multiple natural dyes indicates a slight increase of efficiencies [16,17,18], adding a toxic and expensive ruthenium-based dye like the well-known N719 to natural dyes, extracted from plants [19], leads to a higher efficiency increase; however, the efficiency is smaller than with pure N719.…”

Section: Introductionmentioning

confidence: 99%

Effect of Caffeine Copigmentation of Anthocyanin Dyes on DSSC Efficiency

et al. 2019

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Caffeine is known to influence the absorbance spectrum of anthocyanin dyes. Such dyes are often used as sensitizers in dye-sensitized solar cells (DSSCs). Natural dyes, like anthocyanins, yield only small DSSC efficiencies, but are of high interest since they are usually non-toxic and inexpensive. Here we report on the influence of copigmentation of anthocyanins, taken from commercially available tea, with caffeine. In this way, the efficiencies were increased for measurements with a solar simulator as well as with ambient light. In addition, the well-known pH dependence of the efficiency of DSSCs dyed with anthocyanins was shifted—while a pH value of 1–2 was ideal for pure anthocyanins used as dyes, a higher pH value of 2–3 was sufficient to reach the maximum efficiencies for caffeine-copigmented dyes. This means that instead of reducing the pH value by adding an acid, adding caffeine can also be used to increase the efficiency of DSSCs prepared with anthocyanins. Finally, a comparison of several literature sources dealing with anthocyanin-based DSSCs allows for evaluation of our results with respect to the work of other groups.

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Optical, spectral and photovoltaic characterization of natural dyes extracted from leaves of Peltophorum pterocarpum and Acalypha amentacea used as sensitizers for ZnO based dye sensitized solar cells

Cited by 44 publications

References 32 publications

Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

Light Harvesting and Optical-Electronic Properties of Two Quercitin and Rutin Natural Dyes

Effect of Caffeine Copigmentation of Anthocyanin Dyes on DSSC Efficiency

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