JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shaoping Chen,Yachao Wang,Yaning Wang,Wenhao Fan,Jingyun Guo,Jie Chen,Yu Jiang,Rasha Abdullah Ahmed Al-Yusufi,Zuhair A. Munir
In addition to the thermal and electrical characteristics of the thermoelectric material , the energy conversion efficiency of TE devices is influenced by other factors including the interface resistance, which in turn is affected by chemical changes or mechanical failure. We have investigated the use of FeTe as an electrode for iodine-doped PbTe. The telluride of iron has CTE and work function values that match well with those of PbTe. The FeTe/PbTe contact was determined as ohmic in nature with low resistance. Contact resistance and shear strength values were determined over aging times of up to 400 h at 573 K and were found to be nearly unchanged. In contrast, samples in which Fe was used as electrode showed significant decrease in shear strength and a significant increase in joint resistivity over the same aging conditions. From the electrical and thermal characterization, the conversion efficiency of the FeTe/Pb 1.0004 Te 0.997 I 0.003 /FeTe single leg was determined as 4.678% for T h = 673 K and T c = 300 K.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 38
·2202949
·
IF 32.086
Pengfei Xu,Wei Zhao,Xixi Liu,Baohai Jia,Jiaqing He,Liangwei Fu,Biao Xu
Nanostructure engineering is a key strategy for tailoring properties in the fields of batteries, solar cells, thermoelectrics, and so on. Limited by grain coarsening, however, the nanostructure effect gradually degrades during the materials’ manufacturing and in-service period. Herein, a strategy of cleavage-fracture for grain shrinking is developed in a Pb 0.98 Sb 0.02 Te sample during sintering, and the grain size remains stable after repeated tests. Moreover, the initial grain boundary is filled by fractured slender grains and enriched by dislocations, evolving into a hierarchical grain-boundary structure. The lattice thermal conductivity ( k lat ) is greatly reduced to approach the amorphous limit. As a result, a record-high ZT value of ≈1.9 is obtained at 815 K in the n-type Pb 0.98 Sb 0.02 Te sample and a decent efficiency of 6.7% in thermoelectric device. This strategy for grain shrinking will shed light on the application of nanostructure engineering under high temperature and extreme conditions in other material systems.
研究领域:
材料科学
·
热电学
·
纳米技术
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Jinghui Yu,Li Huang,Di Wang,Dandan Du,Chan Zheng
Advances in nanotechnology have provided opportunities to precisely control the morphology of nanostructures and the ability to explore their structure–property relationships. In this work, well-defined PbTe nanostructures with different morphologies were prepared by a one-step microwave synthesis process. The synthesized PbTe nanostructures were incorporated into solid-state silica gel glass matrices by a facile sol-gel approach for application as optical limiters. Nonlinear optical (NLO) and optical limiting (OL) properties were measured by 532-nm laser pulses with a pulse duration of 35 ps to understand the relationship between the NLO properties and the morphology of six PbTe nanostructures (i.e., nanosheets , nanorods , particle assemblies, hoppercubes, nanocubes, and nanoflowers). The PbTe nanostructures had notably different NLO and OL properties, which strongly correlated with the structural characteristics both in liquid and gel glass matrices. The NLO mechanism was also explored and attributed to excited state absorption, which relates to the size and morphology of the nanostructures. The PbTe particle assemblies had the strongest NLO response under laser irradiation, whereas the PbTe nanocubes had the weakest response, both in liquid and a solid-state gel glass matrices. Importantly, a large OL effect was observed for PbTe particle assemblies doped into silica gel glasses, where the OL threshold surpassed that of previously reported semiconductor nanocrystals. This result suggests these materials can be considered as potential candidate for practical applications in the fields of nonlinear optics. Our work provides insights into the morphology dependence of NLO properties and a strategy to optimize the performance of nanostructures through structural design.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Siqi Wang,Zhi Yang,Yuejun Sun,Yu Xiao,Li-Dong Zhao
PbTe-based thermoelectric materials are considered to be a medium-temperature thermoelectric candidates and the high-performance n -type PbTe is urgently to be developed to match its p -type counterpart on account of practical application. Herein, we firstly optimized the carrier density of n -type PbTe through Sb doping, and obtained a maximum ZT value of ∼1.0. Then, based on the optimized carrier density, we introduced ternary compounds AgSb(Se, Te) 2 to suppress the lattice thermal conductivity . Minimum lattice thermal conductivity of n -type PbTe was reduced as low as ∼0.53 W m −1 K −1 and ∼0.62 Wm −1 K −1 through introducing AgSbSe 2 and AgSbTe 2 , respectively. Combining the maintained electrical properties with suppressed thermal conductivity , maximum ZT values ∼1.2 and ∼1.3 were obtained in PbTe+2%AgSbSe 2 and PbTe+2%AgSbTe 2 , respectively. This work provides an effective strategy of synergistically balancing charge and phonon transports in n -type PbTe with ternary AgSb(Se, Te) 2 compounds.
研究领域:
材料科学
·
热电转换
·
凝聚态物理
·
半导体物理
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功能材料
·
能量转换材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Chenghao Zhang,Kangpeng Jin,Hongliang Dong,Wenlong Xu,Pengfei Xu,Zhenhua Yan,Weiyun Zhao,Biao Xu,Liangwei Fu
Modulating electrical and thermal transport through zero-dimensional point defects and one-dimensional dislocations are extensively investigated. However, the systematic study of exploring single-atom-layer vacancies for improving thermoelectric (TE) performance remains rare. In this study, we modulate the number density of single-atom-layer two-dimensional (2D) Te vacancies in lead telluride (PbTe) for the first time through bismuth and indium doping. DFT calculations reveal (Bi, In) co-doping lowers the formation energy of such defects, confirming the feasibility of this method. 2D Te vacancies simultaneously enhance phonon scattering and evoke bond softening, significantly lowering the lattice thermal conductivity . Meanwhile, indium doping generates resonant level in the energy band, which increases the carrier concentration without deteriorating the Seebeck coefficient drastically. As a result, a peak TE figure of merit ( zT ) of ∼1.6 and an average zT ( zT avg ) of 1.17 are achieved in the (Bi, In) co-doped PbTe. Furthermore, a high conversion efficiency of 6.5 % is obtained for the fabricated 2-pair module at a temperature difference of 500 K.
研究领域:
材料科学
·
热电学
·
凝聚态物理
·
缺陷工程
·
能量转换
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Shaoqing Lu,Zhengyi Zhu,Weite Meng,Jian Wang,Lulu Huang,Mengyao Li,Aziz Genç,Siqi Huo,Khak Ho Lim,Andreu Cabot,Yucheng Wu,Yu Zhang,Min Hong,Jian Yan,Yu Liu
Thermoelectric (TE) materials, capable of directly converting heat into electricity, offer a promising route for sustainable energy recovery. However, practical deployment is limited by the difficulty in simultaneously optimizing electrical and thermal transport properties. In this study, a synergistic microstructure-composition co-design strategy for enhancing the performance of PbTe-based TEs via Na 2 S-assisted solid-state synthesis is presented. The thermal decomposition of Na 2 S not only introduces hierarchical porosity but also facilitates initial Na doping, enabling the concurrent optimization of phonon scattering, carrier concentration, and band convergence. The optimized composition, Pb 0.97 Na 0.03 Te-1.0%Na 2 S, exhibits refined grains, dispersed Na 2 Te nanoprecipitates, and a high density of dislocations, leading to ultralow lattice thermal conductivity (≈0.50 W m −1 K −1 at 750 K) while preserving excellent electrical transport. A peak TE figure of merit zT ≈2.2 at 823 K and a high average zT ≈1.9 across 623–823 K are achieved. To validate the device-level applicability, single-leg TE modules are fabricated, achieving a high conversion efficiency of 13.4% at Δ T = 395 K, which is among the best reported for a PbTe-based system. Furthermore, a unicouple module integrated with n-type skutterudite reaches a record power density of 2.2 W cm −2 at Δ T = 375 K. This study highlights a scalable pathway for advancing mid-temperature TE materials and devices through structural and compositional engineering.
研究领域:
材料科学
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热电学
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固态化学
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能量转换
·
纳米材料
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产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2016
·Vol. 59
·期 10
·1264-1269
·
IF 2.429
Liu Gang,Xue Zhenjie,Xu Guiying,Yan Cong,Wang Tie
In this paper, PbTe nanocubes are assembled on Bi 0.5 Sb 1.5 Te 3 substrates with both ordered and disordered structures through a straightforward method to form a P-N section. The work function of such semiconductor system is then measured by the ultraviolet photoelectron spectroscopy. This results show that the work function of orderly arrayed PbTe deposition is much lower than the disordered assemblies. Such change of the work function provides the possibility to tune it in a P-N section system. The change of the work function is attributed to the less surface roughness and easier electron escaping in the ordered structures.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
DRUG DELIVERY
·
2023
·
IF 6
Yaqin Tu,Wei Zhang,Guorun Fan,Chenming Zou,Jie Zhang,Nan Wu,Jiahui Ding,Wen Qing Zou,Hongjun Xiao,Songwei Tan
High intracellular reactive oxygen species (ROS) level is characteristic of cancer cells and could act as a target for the efficient targeted drug delivery for cancer treatment. Consequently, biomaterials that react to excessive levels of ROS are essential for biomedical applications. In this study, a novel ROS-responsive polymer based on D-α-Tocopheryl polyethylene glycol 1000 succinate (TPGS) and poly (β-thioester) (TPGS-PBTE) was synthesized for targeted delivery of the first-line antineoplastic drug, paclitaxel (PTX). The resultant TPGS-PBTE NPs showed good ROS-responsive capability in size change and drug release. Compared to PTX, PTX-loaded nanoparticles (PTX@TPGS-PBTE NPs) showed enhanced cytotoxicity and higher level of apoptosis toward squamous cell carcinoma (SCC-7) cells. Tumor-targeted delivery of the NPs was also observed, especially after being modified with a tumor-targeting peptide, cRGD. Enhanced tumor growth inhibition was also observed in head and neck cancer SCC-7 murine models. In summary, PTX@TPGS-PBTE NPs can achieve good therapeutic effects of PTX against head and neck cancer both in vitro and in vivo, especially when modified by cRGD for active targeting, which enriched the application of ROS responsive system utilized in the delivery of anticancer drugs.
研究领域:
癌症治疗
·
药学科学
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纳米技术
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·Vol. 54
·期 8
·6300-6314
·
IF 2.5
Wang Longqin,Li Gang,Jiang Yunshan,Ma Haiguo,Deng Shukang,Deng Shuping
Here, we report that a combination of vacuum melting and spark plasma sintering efficiently enhances the thermoelectric properties of the PbTe-PbSe compounds. Thermal analysis results show that all the PbTe 1− x Se x samples have excellent thermal stability. Positron annihilation spectroscopy results indicate improvement of the crystal quality in all obtained PbTe 1− x Se x samples. X-ray photoelectron spectroscopy studies revealed the presence of Pb 2+ , Pb 4+ , Te 2− , Te 4+ , Se 2− states of Pb, Te, and Se. Meanwhile, replacing the isoelectronic cations with those of different electronegativity will lead to a variation in carrier concentration. All samples exhibit p -type conduction with carrier concentrations varying from 0.07 × 10 19 to 7.34 × 10 19 cm −3 , since carrier mobility changes from 4.7 to 727.7 cm 2 V −1 s −1 at room temperature. Therefore, the maximum figure of merit ( ZT ) value reaches 0.6 at 773 K for the PbSe 0.95 Te 0.05 sample benefiting from the greatly reduced thermal conductivity, which is three times more than the intrinsic PbSe. The peak ZT value of 0.70 at 773 K is obtained in PbTe 0.98 Se 0.02 due to the excellent power factor. Valuable insight can be obtained from a quantitative analysis of the thermoelectric transport in PbTe-PbSe compounds with the anion vacancies (Se 2− and Te 2− ). Graphical
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhi Yang,Siqi Wang,Yuejun Sun,Yu Xiao,Li-Dong Zhao
The n -type PbTe still maintains relatively low thermoelectric performance compared with its p -type counterpart. Thus, to promote its performance in n -type PbTe, we conduct successive strategies that firstly suppressing the lattice thermal conductivity ( κ lat ) through alloying with ternary compound AgSbSe 2 , and then optimizing carrier density with Sb, Bi or I doping. In AgSbSe 2 -alloyed PbTe samples, the κ lat can be evidently reduced, and the minimum κ lat decreases from ∼1.1 Wm −1 K −1 in undoped PbTe to ∼0.8 Wm −1 K −1 in PbTe–5%AgSbSe 2 . Based on PbTe–5%AgSbSe 2 matrix, several dopants (Sb, Bi or I) are used to optimize its carrier density, and found that I element is verified to be the most effective dopant to enhance its electrical transport properties. In I-doped PbTe–5%AgSbSe 2 samples, the carrier density raises from ∼2.49 × 10 16 cm −3 in PbTe–5%AgSbSe 2 to ∼1.15 × 10 19 cm −3 in PbTe 0.992 I 0.008 -5%AgSbSe 2 , which contributes to the maximum power factor ∼14.8 μWcm −1 K −2 . Combining the reduced lattice thermal conductivity and improved power factor, the maximum ZT max and average ZT ave values in PbTe 0.992 I 0.008 -5%AgSbSe 2 are boosted to ∼1.0 at 723 K and ∼0.77 at 300–823 K, respectively. This work points out a valid avenue to improve thermoelectric transport property in n -type PbTe with separately successive strategies to adjust its thermal and electrical performance.
研究领域:
材料科学
·
热电学
·
半导体物理
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yu Xiao,Wei Li,Cheng Chang,Yuexing Chen,Li Huang,Jiaqing He,Li-Dong Zhao
We report n-type PbTe with a maximum ZT ∼1.2 at 673 K and an average ZT ave ∼0.84 at 300–823 K, which was achieved through a Sn and Se co-alloying approach. We find that the lattice thermal conductivity can be largely reduced through introducing Se in Te sites, and the power factor can be enhanced through introducing Sn in the Pb sites. Combining two strategies via Se and Sn co-alloying in PbTe, results show that the lattice thermal conductivity at 300 K can be reduced from ∼3.1 Wm −1 K −1 to ∼1.2 Wm −1 K −1 after alloying 15% Se, which is consistent with the Callaway model. Meanwhile, we find that both carrier concentration and mobility can be enhanced through alloying small amount of Sn, which are supported by DFT calculation with emphasis on the defect formation energies . The improvement on electrical conductivity elucidates an enhanced power factor at 300 K increasing from ∼6.4 μWcm −1 K −2 to ∼14.6 μWcm −1 K −2 . Through synergistically optimizing electrical and thermal transport properties of n-type PbTe via Sn and Se co-alloying, the ZT value is distinctly enhanced to 1.2 at 673 K, and the average ZT ave value is improved by ∼35%, from ∼0.62 in PbTe 0.997 I 0.003 to ∼0.84 in Pb 0.995 Sn 0.005 Te 0.847 Se 0.15 I 0.003 , ensuring a high maximum thermoelectric conversion efficiency ∼10.7%.
研究领域:
材料科学
·
热电学
·
固体物理
·
能量转换材料
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2026
·
IF 5.2
Xueli Zuo,Feida Chen,Shujie Wu,Wei Zheng,Yuan Liu,Jun Li,Jifeng Zhang,Xiaobin Tang
Simultaneously optimizing electrical and thermal transport properties remains a major challenge for thermoelectric materials. In this work, high-entropy secondary phases (HE2P) were introduced into a Cu-doped PbTe matrix to improve the thermoelectric performance of n-type PbTe. Carbon-coated HE2P particles were incorporated into the PbTe matrix through vacuum melting and fast hot-pressing, resulting in a hierarchical microstructure with refined grains, heterointerfaces, and defect structures. The introduced HE2P effectively suppresses lattice thermal conductivity through enhanced phonon scattering induced by interfaces, lattice distortion, and mass fluctuation. Meanwhile, the heterogeneous interfaces introduced by the carbon-coated HE2P particles may also influence carrier transport behavior. As a result, the composite with 7% HE2P achieves a low lattice thermal conductivity of 0.39 W m −1 K −1 at 838 K and a peak ZT value of 1.38, together with an average ZT of 1.01 over 300–850 K. These results suggest that incorporating high-entropy secondary phases provides a feasible approach for improving the thermoelectric performance of PbTe-based materials.
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高影响因子
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