Transition metal nanohybrid as efficient and stable counter electrode for heterostructure quantum dot sensitized solar cells: A trial

Kusuma, J.; Akash, S.; Balakrishna, R. Geetha

doi:10.1016/j.solener.2020.03.048

Cited by 17 publications

(7 citation statements)

References 47 publications

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“…The upshift of the Fermi level in the ETL accelerates the electron transfer and reduces the recombination loss across the interfaces of QDs/HTL and ETL/HTL, which eventually results in the enhancement of V oc . Also, more negative flat-band potential and higher concentration of charge carriers as realized from the MS plot account for the observed enhanced V oc and J sc . − The observed deviations in the diode curve for the devices are attributed to the poor contacts at the HTL/CE interfaces, causing the lowering of shunt resistance; this can be overcome by engineering counter electrode materials. , The external quantum efficiencies (EQEs) of these devices were not obtained as a result of lower shunt resistance. , However, it can be anticipated that this limitation can be further overcome by engineering better deposition of hole transport material (HTM) onto CE.…”

Section: Resultsmentioning

confidence: 99%

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

et al. 2022

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In this study, titanium oxynitride with empirical composition of TiON is developed using a sol−gel and ammoniagas-assisted thermal nitridation process. The obtained TiON phase is employed as the photoanodic electron transport layer (ETL) in a silver bismuth sulfide (AgBiS 2 ) quantum-dot-sensitized solar cell (QDSSC) device and compared to a QDSSC consisting of commercial TiO 2 as the ETL. The obtained X-ray photoelectron spectroscopy spectra and Mott−Schottky plots of the samples suggested that the valence and conduction bands of TiON are significantly shifted (E VB = 2.9 eV and E CB = −0.3 eV) with respect to that of TiO 2 (E VB = 1.88 eV and E CB = −0.51 eV), which eventually decreased its band gap energy to 2.46 eV compared to TiO 2 (3.2 eV). A decrease in the charge transfer resistance (R ct = 38.2 Ω) and improvement in carrier lifetime (τ = 5.3 ms) are observed in the developed TiON device. The work also endorses the use of eco-friendly green quantum dots of AgBiS 2 as photoabsorbers in solar cells. Although the photovoltaic performance is not found to be greater, the demonstration of the enhanced performance of the TiON-based device with ∼50% enhancements, owing to its improved open circuit voltage and current density by 20 and 35%, is achieved in this work. Titanium oxynitride can, hence, be considered a suitable alternative to existing commercial TiO 2 in all applications that involve solar energy conversion.

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Section: Resultsmentioning

confidence: 99%

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

et al. 2022

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“…Even though QDs have highly desirable properties, their efficiencies in QDSSCs have been reported to be lower than that of DSSCs. To the best of our knowledge, few reports on the development or improvement of CEs are found in the literature [56,[103][104][105]. Therefore, more research should be conducted and exploited in this area.…”

Section: Application Of Niseqd In Solar Cellsmentioning

confidence: 99%

Nickel Selenide Quantum Dot Applications in Electrocatalysis and Sensors

et al. 2020

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Quantum dots (QDs) are semiconducting materials with diameters ranging from 2-10 nm. Amongst these QDs, nickel selenide quantum dot (NiSeQD) materials have gained much interest from researchers over the past few years due to their outstanding properties. These include excellent catalytic activity, good electrical conductivity for charge transfer, and excellent thermodynamic stability. NiSeQD material is relatively cheap, less toxic, and can be synthesised easily. Due to the fascinating and remarkable properties of NiSeQD, the material has been applied in various electrochemical fields, including hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and solar cells. This review focuses on the application of NiSeQD and its composites in the various analytical fields in the search for alternative renewable sources of energy. Interestingly, NiSeQD material can be modified with different materials to improve its sensitivity, reactivity, and limit of detection. The effects of modification with other materials such as iron (Fe), cobalt (Co), and graphene (GN) are mentioned. Additionally, the application of NiSeQD in glucose sensing is discussed briefly. In these aforementioned applications, NiSeQD has shown excellent electrocatalytic capability with satisfactory detection limits and good conductivity. Thus, further exploration of it to other fields is essential. This review highlights the importance of NiSeQD in water purification, and no report has been documented in the literature on its application in water purification. Some gaps are still open for the use of NiSeQD material as an electroactive platform for sensing devices in water treatment.

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“…Quantum dots are interesting nanomaterials having unique electrical and optical properties, such as bright photoluminescence and size‐dependent optoelectronic properties [11] . Quantum dots are normally composed of elements from groups III–V, II–VI, or IV–VI of the periodic table, such as cadmium and lead [12] . They have excellent fluorescence properties and are widely used in sensing applications.…”

Section: Introductionmentioning

confidence: 99%

“…[11] Quantum dots are normally composed of elements from groups III-V, II-VI, or IV-VI of the periodic table, such as cadmium and lead. [12] They have excellent fluorescence properties and are widely used in sensing applications. The toxicity of heavy metals however limits quantum dots for practical uses.…”

Section: Introductionmentioning

confidence: 99%

High‐performance Mg²⁺ Sensors Based on Natural Rubber‐derived, Label‐free Carbon Dots

et al. 2022

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Detection of trace magnesium ion (Mg 2 + ) is important in environmental and health monitoring. In this work, highperformance Mg 2 + sensor was developed from label-free carbon dots. The novel carbon dots were prepared for the first time from natural rubber through the two-step pyrolysis and hydrothermal method. They showed selectivity towards Mg 2 + against a range of metal ions in solution and yielded a detection limit of 4.3 μM. The Mg 2 + detection in real water samples showed an excellent recovery of 97.21 to 99.21 %. A paper-based sensor was also fabricated as a portable device, showing a detection limit of 8.0 μM. UV-vis and X-ray absorption studies provided some evidences of the unique dynamic interactions between carbon dots and Mg 2 + ions. In summary, the novelty of this work lies upon (i) developing a methodology of converting abundant, low-cost natural rubber into carbon dots and (ii) fabricating sensitive and selective sensors from the label-free carbon dots for the detection of Mg 2 + both in solution and as paper-based devices. The findings in this work will therefore have potential for environmental and health monitoring applications.

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Transition metal nanohybrid as efficient and stable counter electrode for heterostructure quantum dot sensitized solar cells: A trial

Cited by 17 publications

References 47 publications

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

Nickel Selenide Quantum Dot Applications in Electrocatalysis and Sensors

High‐performance Mg²⁺ Sensors Based on Natural Rubber‐derived, Label‐free Carbon Dots

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Transition metal nanohybrid as efficient and stable counter electrode for heterostructure quantum dot sensitized solar cells: A trial

Cited by 17 publications

References 47 publications

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS2 Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS2 Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

Nickel Selenide Quantum Dot Applications in Electrocatalysis and Sensors

High‐performance Mg2+ Sensors Based on Natural Rubber‐derived, Label‐free Carbon Dots

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Product

Resources

About

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

Manifestation of the Enhanced Photovoltaic Performance in Eco-Friendly AgBiS₂ Solar Cells Using Titanium Oxynitride as the Electron Transport Layer

High‐performance Mg²⁺ Sensors Based on Natural Rubber‐derived, Label‐free Carbon Dots