Thermoelectric Properties of Bismuth Telluride Thin Films Electrodeposited from a Nonaqueous Solution

Cicvarić, Katarina; Meng, Lingcong; Newbrook, Daniel W.; Huang, Ruomeng; Ye, Sheng; Zhang, Wenjian; Hector, Andrew L.; Reid, Gillian; Bartlett, Philip N.; Groot, C. H. de

doi:10.1021/acsomega.0c01284

Cited by 24 publications

(14 citation statements)

References 38 publications

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“…To reveal the valence state of the as-sintered (GeTe) 0.94 (CuBiSe 2 ) 0.06 pellets, the X-ray photoelectron spectroscopy (XPS) scans of Cu and Bi elements were carried out and the results are shown in Figure 3h,i. The valence of Cu can be mainly indexed as +1 state [44] and Bi can be solely indexed as +3 state, [45,46] suggesting that the introduction of Cu and Bi in the ratio of 1:1 has negligible influence on n h comparing with the reduced amount of Ge vacancies.…”

Section: Resultsmentioning

confidence: 99%

High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe

Yin

Liu

et al. 2021

Advanced Energy Materials

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Dimensionless figure-of-merit (zT) is the most typical descriptor to evaluate thermoelectric materials, which is defined as zT = S 2 σT/κ, where S, σ, T and κ are the Seebeck coefficient, the electrical conductivity, the absolute temperature, and the thermal conductivity, respectively. [4,5] κ includes the lattice thermal conductivity (κ l ) and the electrical thermal conductivity (κ e ). [6,7] To achieve high energy conversion efficiency, high zT values with high power factor (S 2 σ) and low κ are required. According to extensive investigations, S 2 σ can be increased by quantum confinement, [8,9] modulation doping, [10] band convergence, [5,11] and resonant state engineering. [12,13] Whereas, κ (mainly κ l ) is mainly reduced by introducing a variety of lattice defects as phonon scattering centers such as point defects, [14,15] dislocations, [16,17] stacking faults, [18,19] nano precipitates, [20,21] and hierarchical architecture structures. [22,23] GeTe is a promising mid-temperature material with a phase transition from the rhombohedral phase (R-GeTe) to the cubic phase (C-GeTe) at ≈700 K. However, the intrinsic high carrier concentration (n h for p-type GeTe, ≈10 21 cm −3 due to massive Ge vacancies) limits its S 2 σ and thus zT (≈0.75 at ≈740 K). [24,25] To According to theMott's relation, the figure-of-merit of a thermoelectric material depends on the charge carrier concentration and carrier mobility. This explains the observation that low thermoelectric properties of GeTe-based materials suffer from the degraded carrier mobility, on account of the fluctuation of electronegativity and ionicity of various elements. Here, highperformance CuBiSe 2 alloyed GeTe with high carrier mobility due to the small electronegativity difference between Cu and Ge atoms and the weak ionicity of CuTe and BiTe bonds, is developed. Density functional theory calculations indicate that CuBiSe 2 alloying increases the formation energy of Ge vacancies and correspondingly reduces the amount of Ge vacancies, leading to an optimized carrier concentration and a high power factor of ≈37.4 µW cm −1 K −2 at 723 K. Moreover, CuBiSe 2 alloying induces dense point defects and triggers ubiquitous lattice distortions, leading to a reduced lattice thermal conductivity of 0.39 W m −1 K −1 at 723 K. These synergistic effects result in an optimization of the carrier mobility, the carrier concentration, and the lattice thermal conductivity, which favors an enhanced peak figure-of-merit of ≈2.2 at 723 K in (GeTe) 0.94 (CuBiSe 2 ) 0.06 . This study provides guidance for the screening of GeTe-based thermoelectric materials with high carrier mobility.

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Section: Resultsmentioning

confidence: 99%

High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe

Yin

Liu

et al. 2021

Advanced Energy Materials

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“…This buffing pad contained alumina powder with the particle size of 1 μm. 27 The electrode surface was rubbed in a manner of digit eight, resulting in smooth appearance, on the buffing pad. The ultimate goal of rubbing was to avoid the presence of grooves on the surface of the electrode.…”

Section: Methodsmentioning

confidence: 99%

“…This buffing pad contained alumina powder with the particle size of 1 μm . The electrode surface was rubbed in a manner of digit eight, resulting in smooth appearance, on the buffing pad.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical Sensing Platform Based on Functionalized Multi-Walled Carbon Nanotubes and Metal Oxide for the Detection and Degradation Studies of Orange II Dye

et al. 2022

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Textile industry effluents are heavily contaminated with dyes. The discharge of these toxic dyes into waterbodies poses a serious threat to aquatic flora and fauna. The ultimate entrance of these toxins from thereon into the food chain affects the primary and secondary consumers. Therefore, the adoption of a sustainable solution for protection against the detrimental effects associated with adulterated water is an immediate need of the hour. To address the severity of the issue, the present work aims to design an electrochemical sensing platform by modifying the glassy carbon electrode (GCE) with zinc oxide nanoparticles and amino group-functionalized multi-walled carbon nanotubes (NH 2 -fMWCNTs) for the detection of Orange II, which is a toxic azo dye. Zinc oxide nanoparticles facilitate electron transfer between the transducer and the analyte. While, the positively charged NH 2 -fMWCNTs in acidic medium help in preconcentration of negatively charged analyte molecules at the electrode/electrolyte interface. The modification of the GCE catalyzed the oxidation of Orange II, as evidenced by the negative shift of the oxidation potential and enhancement in peak current intensity. Square wave voltammetry was used to optimize various experimental conditions, such as the supporting electrolyte, pH of the electrolyte, deposition potential, and deposition time for the best performance of the designed sensor. Under the optimized conditions, the detection limit and quantification of the designed sensor were found to be 0.57 and 1.92 nM, respectively. The catalytic degradation studies of Orange II was shown to be facilitated by titanium dioxide, which acted as a photocatalyst. The addition of hydrogen peroxide further promoted the extent and rate of degradation of dye. The breakdown of Orange II was probed by the designed sensing platform electrochemically and also by UV–visible spectroscopy. The dye degraded up to 92% by following pseudo-first-order kinetics.

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“…Moreover, Zhou's work demonstrated the co-condensation of APTES and TEOS as a brand-new universal way to attain the surface activation of Bi 2 Te 3 nanosheets. 89 For PDT, whose performance is restricted by the hypoxic tumor microenvironment, the multi-step functionalized method provides it with the solution of developing oxygen-independent agents. By means of using a two-step ‘regioselective coordination’ and subsequent ‘orientational oxidation’ functionalized synthesis strategy, Qiu et al came up with the 2D Bi/BiOx lateral nano-heterostructure as a high-performance oxygen-independent PDT agent (Fig.…”

Section: Preparation Of Bi-based 2d Nanomaterialsmentioning

confidence: 99%

Bismuth-based two-dimensional nanomaterials for cancer diagnosis and treatment

Hong,

Chen,

et al. 2023

J. Mater. Chem. B

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Thermoelectric Properties of Bismuth Telluride Thin Films Electrodeposited from a Nonaqueous Solution

Cited by 24 publications

References 38 publications

High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe

High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe

Electrochemical Sensing Platform Based on Functionalized Multi-Walled Carbon Nanotubes and Metal Oxide for the Detection and Degradation Studies of Orange II Dye

Bismuth-based two-dimensional nanomaterials for cancer diagnosis and treatment

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Thermoelectric Properties of Bismuth Telluride Thin Films Electrodeposited from a Nonaqueous Solution

Cited by 24 publications

References 38 publications

High Carrier Mobility and High Figure of Merit in the CuBiSe2 Alloyed GeTe

High Carrier Mobility and High Figure of Merit in the CuBiSe2 Alloyed GeTe

Electrochemical Sensing Platform Based on Functionalized Multi-Walled Carbon Nanotubes and Metal Oxide for the Detection and Degradation Studies of Orange II Dye

Bismuth-based two-dimensional nanomaterials for cancer diagnosis and treatment

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High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe

High Carrier Mobility and High Figure of Merit in the CuBiSe₂ Alloyed GeTe