AC conductivity and electrical relaxation of a promising Ag2S-Ge-Te-Se chalcogenide glassy system

Chamuah, Anil; Ojha, Swarupa; Bhattacharya, Koyel; Ghosh, Chinmoy; Bhattacharya, Sanjib

doi:10.1016/j.jpcs.2022.110695

Cited by 27 publications

(5 citation statements)

References 43 publications

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“…The improved PL peak intensity manifested the decreased nonradiative recombination. The trap density of states (tDOS) curves derived by thermal admittance spectroscopy (TAS) measurements, [38,39] as displayed in Figure 4b, suggested a decrease in trap density at the shallow trap region between 0.31 and 0.37 eV after EDTA surface treatment. Shallow-level traps can serve as pathways for ion migration, which can compromise the intrinsic stability of both the perovskite film and device.…”

Section: Resultsmentioning

confidence: 99%

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Chen,

Cheng,

et al. 2024

Advanced Materials

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Perovskite solar cells (PSCs) have been developed rapidly in efficiency and stability in recent years, which can compete with silicon solar cells. However, an important obstacle to the commercialization of PSCs is the toxicity of lead ions (Pb2+) from water‐soluble perovskites. The entry of free Pb2+ into organisms can will cause severe harm to humans, such as blood lead poisoning, organ failure, etc. Therefore, we report a “lead isolation‐capture” dual detoxification strategy with calcium disodium edetate (EDTA Na‐Ca), which can inhibit lead leakage from PSCs under extreme conditions. More importantly, leaked lead exists in a nontoxic aggregation state chelated by EDTA. For the first time, in vivo experiments were conducted in mice to systematically prove that this material has a significant inhibitory effect on the toxicity of perovskites. In addition, this strategy can further enhance device performance, enabling the optimized devices to achieve an impressive power conversion efficiency (PCE) of 25.19%. This innovative strategy is a major breakthrough in the research on the prevention of lead toxicity in PSCs.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Chen,

Cheng,

et al. 2024

Advanced Materials

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“…The nano-crystallites were identi-ed as short-range order due to the structural alterations. 48 Using the XRD pattern of the as-prepared g-Se:Gr sample, we determined the average nano-crystallite size, the dislocation density (d), and micro-strain (3) 49,50 and their values are listed in Table 1. However, the appearance of any graphene crystallographic peak could not be conrmed by the XRD pattern as a signature of the incorporation of graphene in the host matrix.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of nanostructured graphene-doped selenium

2023

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“…The total conductivity expressed as a sum of DC and AC conductivity components could be derived from Jonscher's power law. where σ DC is the frequency-independent DC component of conductivity representing the thermally activated drift current, A is a pre-exponential factor, and s is the Universal Dielectric Response (UDR), also termed the power law exponent [65]. The value of s was deduced from the slope of the line fit obtained by the linear least square fitting method.…”

Section: Electrical Conductivity Analysismentioning

confidence: 99%

Thermogravimetric and temperature-dependent electrical investigations of Pr³⁺ doped multi-component silicate glasses for microelectronic technology

2024

Phys. Scr.

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Multi-component silicate glasses doped with 0, 0.5, 1, and 1.5 mol% of praseodymium (Pr3+) were synthesized by the sol-gel method. Thermal analysis of the glasses, evinced a high working temperature of 351 °C and Hruby coefficient, KH = 1.415 in the highly doped system, corroborating the effective role of Pr3+ ions in endowing superior thermal stability to the glass. Broadband dielectric spectroscopy was applied to study the temperature-dependent electrical behavior of the glasses for their suitability as electrodes and solid electrolyte materials in batteries. A high dielectric constant of 4797 was evidenced at 1 kHz when recorded at 473 K. The AC conductivity of the glass doped with 1 mol% was observed to be the highest with 94.8 x 10-5 S/cm at 10 MHz and 473 K. Jonscher’s power law exponent decreased with temperature, attributing the conducting mechanism to the Correlated Barrier Hopping (CBH) model. The Nyquist impedance spectra demonstrated a depressed semicircle with a spur at the low-frequency end, validating the non-Debye relaxation in the glasses. The equivalent circuitry of the plot predicted parallel combinations of resistor and constant phase elements which reflects a Warburg diffusion and capacitive approach. Bode’s phasor diagram confirmed the capacitive nature by a phase angle of -90 ° in all the glasses. While a uniform increase in dielectric constant and conductivity was observed up to 1 mol% of Pr3+, a sharp decline in the electrical phenomenon was observed with 1.5 mol% of Pr3+, due to the possible blockade of the hopping of charge carriers by the largely quantified dopant ions. Extracting a high dielectric constant, and ionic conductivity at high frequencies, with an optimal dopant concentration of 1 mol% Pr3+, the composite glasses could be considered for their potential use in integrated microcomponent storage devices as cathode and solid electrolyte materials.

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AC conductivity and electrical relaxation of a promising Ag2S-Ge-Te-Se chalcogenide glassy system

Cited by 27 publications

References 43 publications

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Synthesis and characterization of nanostructured graphene-doped selenium

Thermogravimetric and temperature-dependent electrical investigations of Pr³⁺ doped multi-component silicate glasses for microelectronic technology

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AC conductivity and electrical relaxation of a promising Ag2S-Ge-Te-Se chalcogenide glassy system

Cited by 27 publications

References 43 publications

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Lead Isolation and Capture in Perovskite Photovoltaics toward Eco‐Friendly Commercialization

Synthesis and characterization of nanostructured graphene-doped selenium

Thermogravimetric and temperature-dependent electrical investigations of Pr3+ doped multi-component silicate glasses for microelectronic technology

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Product

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Thermogravimetric and temperature-dependent electrical investigations of Pr³⁺ doped multi-component silicate glasses for microelectronic technology