Effect of co-sensitization of InSb quantum dots on enhancing the photoconversion efficiency of CdS based quantum dot sensitized solar cells

Archana, T.; Vijayakumar, K. P.; Subashini, G.; Grace, Andrews Nirmala; Arivanandhan, M.; Jayavel, R.

doi:10.1039/c9ra10118g

Cited by 16 publications

(13 citation statements)

References 56 publications

(77 reference statements)

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“…The use of volume or comprehensive surfaces for the preparation of NPs leads to development of various NPs in order to achieve the minute clusters with optical, chemical reactivity and electronic properties. To anticipate the evolution of these properties with particle size, complex quantum mechanics are necessary and usually well-de ned conditions are important to compare observations and theoretical forecasts (41,42).…”

Section: Physical Preparation Of Npsmentioning

confidence: 99%

Biogenic Green Synthesis of Nanoparticles from Living sources with Special Emphasis on Their Biomedical Applications

Ga¹,

Nanda²,

Chakravorty³

et al. 2021

Preprint

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Nanobiotechnology has been achieved great significance in terms of nanomedicine & many others. But the first challenge in nanobiotechnology science is the preparation of stable nanoparticles. Presently, many preparation methods have been developed like different chemical & physical processes, but the main drawbacks of these processes are required hazardous chemicals, environmental impact, and ultimately expenses a lot. To overcome these challenges another advanced technology has been developed, which is termed green or biogenic synthesis. This review is discussing the modern approaches of the eco-friendly and cost-effective methodology of green synthesis of nanoparticles by using different eukaryotic & prokaryotic agents like plants, human cell lines, diatoms, algae, fungi, bacteria, viruses, and other organisms. Also, this review gives a clear idea of the different applications of those nanoparticles in drug delivery, dentistry, labeling, diagnostics & sensors.

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Section: Physical Preparation Of Npsmentioning

confidence: 99%

Biogenic Green Synthesis of Nanoparticles from Living sources with Special Emphasis on Their Biomedical Applications

Ga¹,

Nanda²,

Chakravorty³

et al. 2021

Preprint

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“…As mentioned earlier, when the dimension of nanoparticles is less than their Bohr radius, the particle can be defined as QDs. [ 3,43 ] As the Bohr radius of SnTe particles is 95 nm, and the size of the majority of as‐prepared SnTe nanoparticles is less than the Bohr radius, these prepared particles can be recognized as QDs. For further investigation, atomic force microscopy (AFM, Asylum MFP 3D Infinity) was used to examine the surface roughness and thickness of the as‐prepared QDs (Figure 2b).…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…[ 1,2 ] In QDs, inorganic semiconducting nanocrystallites exhibit nanometer‐sized excitons, and the critical dimensions of such excitons are smaller or equivalent to the size of the Bohr radius of excitons. [ 3 ] Owing to the extremely small size of QDs, quantum confinement occurs in the electrons and holes from all three dimensions, leading to a higher surface‐to‐volume ratio and stronger edge effect. [ 4 ] This not only results in remarkable structural transformations but also influences the spacing of energy levels and discrete electronic states, thereby increasing the effective bandgap of the material.…”

Section: Introductionmentioning

confidence: 99%

“…[ 29,30 ] Moreover, as SnTe has large Bohr radius (95 nm) and small effective electron–hole mass ( m eh ≈ 0.025 m 0 ), [ 31 ] the properties of SnTe nanoparticles can be tuned within the quantum confinement region by changing its size only, which might be difficult for conventional QDs with smaller Bohr radii, such as carbon QDs (less than 10 nm), CdSe (6.1 nm), CdS (3.4 nm), and PbS (20 nm). [ 3,32–34 ] However, till date, only a few works have been practically demonstrated using SnTe QDs. Khosravi et al.…”

Section: Introductionmentioning

confidence: 99%

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Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

Ahmed

Qiao

Cheng

et al. 2020

Advanced Optical Materials

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Tin telluride (SnTe) quantum dots (QDs) have attracted considerable interest in the optoelectronic field owing to their favorable properties over conventional QDs, such as a relatively large Bohr radius (95 nm) and low toxicity level. However, till date, the nonlinear optical properties and ultrafast photonics applications of SnTe QDs have remained unexplored. In this study, SnTe QDs with an average diameter of 74 nm (smaller than the Bohr radius of SnTe) are fabricated via a liquid‐phase exfoliation method. Consequently, the nonlinear saturable absorption properties of such SnTe QDs are explored by realizing a modulation depth of 2.2% and saturable intensity of 1.67 GW cm−2. The prepared QDs are then used as saturable absorber (SA) in the erbium‐doped fiber laser ring cavity system. Moreover, Q‐switched and mode‐locked laser pulses with a pulse width of 1.81 µs and 691 fs are generated, respectively. Harmonic mode‐locking with a high repetition rate of 62.1 MHz (fifth order) is experimentally realized. This is the first demonstration, to the authors’ knowledge, of using SnTe QDs‐SA for generating ultrafast laser pulses along with high‐repetition‐rate harmonic mode‐locking pulses. Therefore, this study will establish a new research scope for SnTe QDs in ultrafast photonics, nonlinear photonics, frequency combs, and optical communications.

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“…[5][6][7][8] But still the conversion efficiency of QDSSCs is limited, and is highly challenging to improve the PCE of QDSSCs. Recently several strategies have been followed to improve the PCE of QDSSC by modifying the sensitizers, 9 photoanodes, 10 CEs, 11 and electrolytes. 12 Moreover, recent research focusing on enhancing the efficacy of non-toxic materials in QDSSCs to develop cells with eco-friendly components.…”

mentioning

confidence: 99%

The effect of graphene quantum dots/ ZnS co‐passivation on enhancing the photovoltaic performance of CdS quantum dot sensitized solar cells

et al. 2021

Self Cite

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The effect of graphene quantum dots (GQDs) as a passivating layer for cadmium sulfide (CdS) quantum dot-sensitized solar cell (QDSSC) has been investigated. GQDs were prepared by the liquid exfoliation method. The optical properties of GQDs were studied by UV-Vis and photoluminescence spectroscopies. The morphology of GQDs was studied by transmission emission morphology (TEM) analysis. Further, the photoexcitation behavior of GQDs has been studied in detail using emission spectroscopy and its effect on the photovoltaic performance of CdS QDSSC has been explored using J-V analysis. The efficacy of GQDs as passivation layer over the CdS loaded titanium dioxide (TiO 2 ) photoanode in QDSSC is high and thereby improved the open-circuit voltage (V oc ) (555 mV) compared to zinc sulfide (ZnS) passivated QDSSC (509 mV). As a result, the photoconversion efficiency (PCE) of GQD-passivated QDSSC is relatively enhanced up to 25% higher than that of ZnS-passivated QDSSC under similar conditions. A high PCE of 4.26% has been achieved for GQD/ZnS co-passivated QDSSC, which is 31% higher than ZnS-passivated QDSSC. Besides, the impedance analysis revealed low internal resistance and high charge recombination resistance in the GQD-passivated QDSSC when compared to other cells. The presence of GQD layer suppressed the recombination with high electron transport and thereby improved the PCE of QDSSC. The present study shows the possibility of using GQDs as an interfacial passivation layer between the sensitizer and electrolytes for enhancing the photovoltaic performance of CdS-based QDSSCs.

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Effect of co-sensitization of InSb quantum dots on enhancing the photoconversion efficiency of CdS based quantum dot sensitized solar cells

Abstract: InSb co-sensitized QDSSCs showed relatively higher efficiency (4.94%) than CdS based QDSSCs (3.52%) due to improved light absorption with low recombination losses.

Cited by 16 publications

References 56 publications

Biogenic Green Synthesis of Nanoparticles from Living sources with Special Emphasis on Their Biomedical Applications

Biogenic Green Synthesis of Nanoparticles from Living sources with Special Emphasis on Their Biomedical Applications

Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

The effect of graphene quantum dots/ ZnS co‐passivation on enhancing the photovoltaic performance of CdS quantum dot sensitized solar cells

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