Natural dyes as photo-sensitizer in solar cells

Silwal, Surendra Bikram; Adhikari, Rameshwar; Lamichhane, P.; Bhandari, Netra Lal

doi:10.3126/bibechana.v17i0.25599

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The values of these parameters are shown in Table 3 . The efficiency ( η ) and fill factor ( FF ) for thin films of DSSCs are calculated by the following formulas [ 65 ].

…”

Section: Resultsmentioning

confidence: 99%

Photovoltaic Properties of ZnO Films Co-Doped with Mn and La to Enhance Solar Cell Efficiency

et al. 2022

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In the present investigation, ZnO films co-doped with Mn and La were synthesized by the sol–gel technique. XRD analysis revealed that ZnO had a hexagonal structure. Mixed hexagonal and cubic phases appeared in ZnO containing Mn (1%) and La (1.5%). The grain size, d-spacing, unit cell, lattice parameters, atomic packing fraction, volume, strain, crystallinity, and bond length of co-doped ZnO films were determined as a function of doped ion contents. Through UV analysis, it was found that pristine ZnO had Eg = 3.5 eV, and it decreased when increasing the doping concentration, reaching the minimum value for the sample with 1% Mn and 1% La. The optical parameters of the films, such as absorption, transmittance, dielectric constants, and refractive index, were also analyzed. DSSCs were fabricated using the prepared ZnO films. For pure ZnO film, the values were: efficiency = 0.69%, current density = 2.5 mAcm−2, and open-circuit voltage = 0.56 V. When ZnO was co-doped with Mn and La, the efficiency increased significantly. DSSCs with a ZnO photoanode co-doped with 1% Mn and 1% La exhibited maximum values of Jsc = 4.28 mAcm−2, Voc = 0.6 V, and efficiency = 1.89%, which is 174% better than pristine ZnO-based DSSCs. This material is good for the electrode of perovskite solar cells.

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“…The values of these parameters are shown in Table 3 . The efficiency ( η ) and fill factor ( FF ) for thin films of DSSCs are calculated by the following formulas [ 65 ].

…”

Section: Resultsmentioning

confidence: 99%

Photovoltaic Properties of ZnO Films Co-Doped with Mn and La to Enhance Solar Cell Efficiency

et al. 2022

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“…Solar energy is one of the most promising alternative energy sources for the future which replaces the limited energy resources from fossil fuels and others. The dye-sensitized solar cell (DSSC), invented by Gratzel in 1991, is a most favorable route toward sunlight harvesting which uses dye molecules adsorbed on the nano-crystalline oxide semiconductors such as TiO2 to collect sunlight (Jiao et al, 2011;Silwal et al, 2020). Dye is used as a sensitizer in dye sensitized solar cells using sensitization of the cell which convert visible light into electricity.…”

Section: Natural Dyes In Dye Sensitized Solar Cells (Dssc)mentioning

confidence: 99%

“…The major challenges working with natural dyes are the low yield in one hand and the color fixing problem on the other, although it has many compensations regarding the health issues and allergic problems. Most of natural dyeing industries use to fix or color the fabrics instantly, due to the difficulties on storing the extracted dyes for long period of time in dry conditions (Kannanmarikani et al, 2015;Das et al, 2016;Silwal et al, 2020). In many cases, it is very difficult to achieve the intended color on fabrics since it varies with water quality, water pH, mordant quantity, concentrations, time duration of coloring, and many other factors for which, a deep research and well experienced expertise are essential (Bhandari et al, 2020;Kannanmarikani et al, 2015).…”

Section: Limitations Of Natural Dyesmentioning

confidence: 99%

An overview of research on plant based natural dyes in Nepal: scope and challenges

Bhandari

Pokhrel

Bhandari

et al. 2020

J. Agric. Nat. Res.

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The worldwide demand of natural dyes is of great interest due to the increased public awareness about the atmospheric and environmental pollution caused by the commercially available synthetic dyes. Nepal being wealthy in flora, would be fine research laboratory land for the plant based natural dyes. Among most of the natural dyes, plant-based dyes/pigments have wide range of applications in fabric, food, drug coloring, therapeutic values and also in solar cells in presence of different mordants. The use of mordant is inevitable during natural dyeing process in order to improve the fastness properties on fabrics, foods and drugs by forming a co-ordination complex with dye. In this article, a short overview of plant based natural dyes extraction applications and their scope and limitations will be discussed with special reference to Nepal. In the present review, the green methods of dye extraction, and dyeing technologies will be discussed, and the research fields based on natural dyes will be explored. Some of the natural dyes has also shown the antimicrobial, antioxidant, antifungal properties and hence are also discussed with biomedical applications.

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“…

Many plants are being used as medicines conventionally from the beginning of ancient civilization to cure many healthrelated complications (Tapsell et al 2006;Bhandari et al 2017). Traditional medicine is used to maintain health as well as to prevent, diagnose, improve or treatment of physical and mental illness (Che et al 2017;Silwal et al 2020;Bhandari et al 2020). According to the WHO's data, 80% of rural areas depend on herbal medicine as the primary health care system, and 25% of prescribed drugs are derived from plants (Basyal & Bhandari 2019;Andreicut et al 2018).

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mentioning

confidence: 99%

Phytochemical Screening and Evaluation of Antimicrobial and Antioxidant Activity of Mahonia napaulensis (Jamanemandro) Bark Extract

Paudel

Sharma

Bhandari

et al. 2021

Nepal Journal of Science and Technology

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Mahonia napaulensis also known as “Jamanemandro” in Nepali is a medium-sized stiff evergreen shrub widely distributed in South East Asia at an altitude of 1000-2000m, is traditionally used to treat dysentery and eye inflammation. This research focuses on screening of the phytochemicals, antimicrobial, and antioxidant properties of this plant. The methanolic extract was prepared using a Soxhlet apparatus. The antioxidant properties of extract were carried out by 50% inhibitory concentration (IC50) values from 2-2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging. The phytochemical screening confirmed the presence of terpenoids, reducing sugars, tannins, alkaloids, glycosides including cardiac glycosides and steroids. The antimicrobial activity was studied using the disc diffusion method in five different human pathogens named Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Salmonella typhi, and Shigella spps. The methanol extract was compared with standard chloramphenicol and showed that methanolic extract of is M.napaulensis exhibit maximum effect against S. aureus with higher growth inhibition zones (27.3 mm), followed by P. aeruginosa, Shigella spps., E. coli and S. typhi. These antimicrobial properties showed similar effect to that of positive control, chloramphenicol. The IC50 values from DPPH radical scavenging were 230.89 µg/mL and 182.73 µg/mL of methanol extract and ascorbic acid, respectively. Due to this antimicrobial and antioxidant properties of M. napaulensis it was widely applicable in biomedical field.

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Natural dyes as photo-sensitizer in solar cells

Cited by 4 publications

References 13 publications

Photovoltaic Properties of ZnO Films Co-Doped with Mn and La to Enhance Solar Cell Efficiency

Photovoltaic Properties of ZnO Films Co-Doped with Mn and La to Enhance Solar Cell Efficiency

An overview of research on plant based natural dyes in Nepal: scope and challenges

Phytochemical Screening and Evaluation of Antimicrobial and Antioxidant Activity of Mahonia napaulensis (Jamanemandro) Bark Extract

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