The origin of constant phase element in equivalent circuit of MIS (n) GaAs structures

Drewniak, Łukasz; Kochowski, S.

doi:10.1007/s10854-020-04447-8

Cited by 15 publications

(10 citation statements)

References 53 publications

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“…The constant phase element (CPE) is composed of CPE-T and CPE-P, which represent interface capacitance and ideal capacitance, respectively. [51,52] Table S4, Supporting Information, shows the fitting parameters of EIS measurements. As shown, compared with the device based on the CdS ETL (R s ¼ 31.84 Ω and R rec ¼ 2.44 Â 10 4 Ω), we find a decreased R s of 26.61 Ω and an increased R rec of 3.01 Â 10 4 Ω.…”

Section: Resultsmentioning

confidence: 99%

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Zhou

Zhu

et al. 2021

Solar RRL

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Organic-inorganic hybrid perovskite materials have gained remarkable attention in the photovoltaic community due to their superior optical and electrical properties, including high carrier mobility, large light absorption coefficient, tunable bandgap, low trap density, etc. [1][2][3][4] Nowadays, the certified record power conversion efficiency (PCE) of perovskite solar cells (PSCs) has been boosted from 3.8% to 25.5%, [5,6] benefitting from great endeavors focusing on interface engineering, composition modulation, solvent engineering, crystallinity regulation, etc. [7][8][9] As one of extensively used architectures, the typical planar-type PSC comprises transparent conductive substrate, compact electron transport layer (ETL), perovskite absorber layer, hole transport layer (HTL), and metal electrode. [10][11][12] Thereinto, ETL plays a critical role in extracting and transport electrons from perovskite materials to conducting substrate. Hence, it is crucial to design high-quality ETLs with outstanding electron extraction capability for high-performance PSCs. [13,14] It is known that TiO 2 serves as a conventional widely used ETL that delivers PSCs with efficiencies >20%. [15,16] However, the preparation of TiO 2 ETLs usually suffers from high-temperature sintering processes (>450 C); moreover, the low electron mobility and high-density oxygen vacancy trap states of TiO 2 also restrict the further development of TiO 2 -based PSCs. [17,18] Under such circumstances, researchers are dedicated to explore more promising low-temperature processed ETLs for PSCs, such as SnO 2 , CdS, ZnS, SnS 2 , etc. [19][20][21][22] Of these ETLs, CdS shows unique advantages, including: 1) CdS thin films

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Section: Resultsmentioning

confidence: 99%

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Zhou

Zhu

et al. 2021

Solar RRL

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“…For n = 0, it becomes a pure resistor, whereas for n = 1, it corresponds to a pure capacitor. Similar equivalent circuit was conceived by several groups to explain the − Z″ vs Z′ plots for a variety of ceramic compounds. − …”

Section: Resultsmentioning

confidence: 99%

Role of Crystal Structure on the Ionic Conduction and Electrical Properties of Germanate Compounds A₂Cu₃Ge₄O₁₂ (A = Na, K)

Chikara

Bera

Kumar

et al. 2023

ACS Appl. Electron. Mater.

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Crystal structure and electrical properties of A 2Cu3Ge4O12 (where A = Na, K) have been investigated by neutron diffraction and electrical impedance spectroscopy (EIS). The real and imaginary parts of the impedance, dielectric constant, and electrical modulus have been studied as a function of frequency and temperature. The crystal structures of the compounds K2Cu3Ge4O12 (KCGO) and Na2Cu3Ge4O12 (NCGO) are made of perfect 2D and quasi-2D alkali metal ion layers, respectively. The dc conductivity occurs due to small polaron hopping for both compounds with single activation energy over the entire experimentally available temperature range. The values of activation energies are 0.90(3) and 1.22(6) eV for KCGO and NCGO, respectively, as determined from dc conductivity and relaxation time analysis. The frequency dependent ac conductivity curves for both compounds follow a universal Jonscher’s power law. Soft bond valence sum analysis of neutron diffraction data reveals that the conduction pathways are confined within a plane in KCGO, whereas they form a one-dimensional channel in NCGO. The bottlenecks for ionic conduction and the role of crystal structure on them are discussed. The scaling behavior of electrical modulus indicates that the relaxation process does not change with temperature; however, a sharp decrease in the time constant has been observed. The present comprehensive study facilitates the understanding of the role of crystal structure on the microscopic mechanism of ionic conduction in both battery materials, which would be useful in designing sodium and potassium based ionic conductors. Further, the constant value of activation energy over the kHz frequency range is suitable for potential applications of the studied materials in avalanche beacons and amateur and geophysical sensors.

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“…To analyze and interpret the Cole–Cole plots, a brick-layer model is usually applied and extensively discussed in literature for powder samples. , According to this model, a material is considered as a 3D homogeneous array of cubic grains as well as identical grain boundaries (Figure c). The mobile ions move from one grain to another grain by crossing such grain boundaries (Figure d). − …”

Section: Resultsmentioning

confidence: 99%

“…The CPE is defined as the fractal capacitance with constant phase in a complex plane as given by C P E = 1 Q false( j ω false) p where Q is the value of the capacitance of the constant phase element and p denotes the degree of deviation from the ideal capacitor (i.e., p = 0 corresponds to a pure resistor and p = 1 corresponds to a pure capacitor). In the recent past, a similar equivalent circuit was used to fit the Cole–Cole plots of several compounds. ,− The details of the selection of the equivalent circuit are discussed later.…”

Section: Resultsmentioning

confidence: 99%

Li-Ion Conduction Mechanism and Relaxation Dynamics in Sorosilicate Compound Li₂Cu₅(Si₂O₇)₂

Chikara,

Bera,

Kumar

et al. 2023

ACS Appl. Electron. Mater.

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Inorganic solid electrolytes are the building blocks for all-solid-state lithium-ion batteries and have substantial advantages in safety and electrochemical as well as mechanical stability compared to organic liquid electrolytes. We report here the Li-ion conduction mechanism and relaxation dynamics in a potential solid electrolyte material, viz. sorosilicate compound Li 2 Cu 5 (Si 2 O 7 ) 2 , by impedance spectroscopy. The dc conductivity follows the Arrhenius behavior with an activation energy of 1.25(4) eV, and it reveals thermally activated lithium-ion conduction. We have shown the importance of a careful selection of an equivalent circuit model to determine the dc conductivity parameters from the impedance data involving contributions from the grain and grain boundaries. The frequency-and temperaturedependent ac conductivity and dielectric constant measurements reveal that the ionic conduction in the present compound occurs through the correlated barrier hopping (CBH) of charge carriers. The ionic conduction pathways within the unit cell have been mapped by the soft bond valence sum (BVS) analysis of the measured neutron diffraction pattern. The analysis indicates the presence of bottlenecks in the lithium-ion conduction pathways along the a axis and along the diagonal direction of the bc plane of the triclinic unit cell which are responsible for the observed high value of activation energy and, hence, the low value of ionic conductivity. Electric modulus studies have confirmed that the ionic conduction relaxation process is thermally activated and it has a spread of relaxation time. Therefore, the present study involving the dc conductivity, ac conductivity, electric modulus, and dielectric constant analyses sheds light on the microscopic mechanism of ionic conduction in Li 2 Cu 5 (Si 2 O 7 ) 2 . The acquired knowledge on the ionic conduction mechanism will be useful for designing efficient ionic conductors for battery applications.

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The origin of constant phase element in equivalent circuit of MIS (n) GaAs structures

Cited by 15 publications

References 53 publications

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Role of Crystal Structure on the Ionic Conduction and Electrical Properties of Germanate Compounds A₂Cu₃Ge₄O₁₂ (A = Na, K)

Li-Ion Conduction Mechanism and Relaxation Dynamics in Sorosilicate Compound Li₂Cu₅(Si₂O₇)₂

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The origin of constant phase element in equivalent circuit of MIS (n) GaAs structures

Cited by 15 publications

References 53 publications

Colloidal SnO2‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO2‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Role of Crystal Structure on the Ionic Conduction and Electrical Properties of Germanate Compounds A2Cu3Ge4O12 (A = Na, K)

Li-Ion Conduction Mechanism and Relaxation Dynamics in Sorosilicate Compound Li2Cu5(Si2O7)2

Contact Info

Product

Resources

About

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Role of Crystal Structure on the Ionic Conduction and Electrical Properties of Germanate Compounds A₂Cu₃Ge₄O₁₂ (A = Na, K)

Li-Ion Conduction Mechanism and Relaxation Dynamics in Sorosilicate Compound Li₂Cu₅(Si₂O₇)₂