JOURNAL OF CRYSTAL GROWTH
·
2012
·
IF 1.726
Shenjie Li,Daocheng Pan
Cu 2 SnSe 3 nanocrystals with a metastable zincblende and wurtzite structure have been successfully synthesized. The crystal structures were confirmed by means of X-ray diffraction and selected area electron diffraction . The lattice mismatch between Cu 2 SnSe 3 and ZnSe is only 0.26%, thus homogeneously alloyed (ZnSe) x (Cu 2 SnSe 3 ) 1− x nanocrystals could be synthesized. The band gaps of nanocrystals can be tuned in a wide range of 2.75 to 0.92 eV; however the bowing parameter as high as 19.1 eV for alloyed (ZnSe) x (Cu 2 SnSe 3 ) 1− x nanocrystals was observed. These low cost and dispersible alloyed (ZnSe) x (Cu 2 SnSe 3 ) 1− x nanocrystals with a targeted band gap have a high potential in thin film solar cells.
研究领域:
材料科学
·
太阳能电池研究
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 33
·6025-6032
·
IF 11.382
Yuyang Li,Guanghua Liu,Tengfei Cao,LiMin Liu,Jiangtao Li,Kexin Chen,Laifeng Li,Yemao Han,Min Zhou
Dense bulk samples of (Ag,In)-co-doped Cu 2 SnSe 3 have been prepared by a fast and one-step method of combustion synthesis, and their thermoelectric properties have been investigated from 323 to 823 K. The experimental results show that Ag-doping at Cu site remarkably enhances the Seebeck coefficient, reduces both electrical and thermal conductivities, and finally increases the figure of merit (ZT) value. The ZT of the Cu 1.85 Ag 0.15 SnSe 3 sample reaches 0.80 at 773 K, which is improved by about 70% compared with the unadulterated sample (ZT = 0.46 at 773 K). First principle calculation indicates that Ag-doping changes the electronic structure of Cu 2 SnSe 3 and results in larger effective mass of carriers, thus enhancing the Seebeck coefficient and reducing the electrical conductivity. The low electrical conductivity caused by Ag-doping can be repaired by accompanying In-doping at Sn site, and by (Ag,In)-co-doping the thermoelectric properties are further promoted. The (Ag,In)-co-doped sample of Cu 1.85 Ag 0.15 Sn 0.9 In 0.1 Se 3 shows the maximum ZT of 1.42 at 823 K, which is likely the best result for Cu 2 SnSe 3 -based materials up to now. This work indicates that co-doping may provide an effective solution to optimize the conflicting material properties for increasing ZT.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 3
·1935-1941
·
IF 1.491
Zhang Aijuan,Chen Qiufan,Yao Wei,Yang Dingfeng,Wang Guoyu,Zhou Xiaoyuan
The large-scale colloidal synthesis and thermoelectric (TE) properties of Co-doped Cu 2 SnSe 3 (CCTSe) alloys are investigated for the first time. The TE properties of the CCTSe bulks were measured in the temperature range from 300 K to 715 K. A large increment in the Seebeck coefficient and a dramatic reduction in the lattice thermal conductivity was observed in CCTSe compounds, and the dimensionless TE figure␣of merit ZT reaches a peak value of 0.63 at 715 K. These observations demonstrate an exciting scientific opportunity to raise the figure-of-merit of colloidally synthesized quaternary chalcogenide nanocrystals via optimized doping.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
Materials Today Physics
·
2018
·
IF 0
Y. Zhou,H. Wu,D. Wang,L. Fu,Y. Zhang,J. He,S.J. Pennycook,L.-D. Zhao
The ternary diamond-like compound Cu 2 SnSe 3 is a potential thermoelectric material . Its Cu-Se conducting network leaves Sn as a likely doping site to optimize the carrier concentration without much deterioration to the carrier mobility . Thus, the precise determination on the intricate phase structures of Cu 2 SnSe 3 is critical. Here, we first use the atomically resolved scanning transmission electron microscopy and reveal an unusual phase coexistence (monoclinic and orthorhombic phases) in Ag-doped Cu 2 SnSe 3 . Owing to coexisting phases and the order–disorder transition in the orthorhombic phase, the Ag-doped Cu 2 SnSe 3 shows an unusual three-stage behavior in its temperature-dependent electrical transport properties and achieves record high power factors in this system. The observed three-stage behavior due to the phase coexistence is supported by the first principle calculations, Hall measurements, and optical diffuse reflectance measurements . To fully understand the band structures and the coherent interface between these coexisting phases, a band contact model is proposed that could well explain the three-stage electrical transport behavior. Moreover, the phase coexistence is observed at the nanoscale regime, thus providing a high density of phase boundaries. Such coexisting nanophases play an important role in lowering the lattice thermal conductivity . As a result, the ZT value obtained in Cu 2 Sn 0.93 Ag 0.07 Se 3 is double that of undoped Cu 2 SnSe 3 .
研究领域:
材料科学
·
凝聚态物理
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DOI
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Yuyang Li,Guanghua Liu,Jiangtao Li,Kexin Chen,Gang He,Zengchao Yang,Yemao Han,Min Zhou,Laifeng Li
Bulk In-doped Cu 2 SnSe 3 samples were prepared by a fast and one-step method of high-gravity combustion synthesis . All the synthesized samples were dense with relative densities of >98%. The influence of Indium-doping on the phase composition of the samples was investigated. SEM and EDS measurements confirm the existence of SnSe and Cu 2 Se as secondary phase in the Cu 2 Sn 1−x In x Se 3 samples. In addition, the experimental results show that there is a solubility limit of indium in the Cu 2 SnSe 3 matrix. The thermoelectric properties of the samples were measured in a temperature range from 323 K to 773 K, and the Cu 2 Sn 0.8 In 0.2 Se 3 sample achieved a maximum ZT of 0.65 at 773 K, which was comparable with the best-reported result for Cu 2 SnSe 3 materials prepared by conventional sintering approaches. With much reduced time and energy consumption, high-gravity combustion synthesis may offer a more efficient and economical way for producing thermoelectric materials .
研究领域:
材料科学
·
无机非金属材料
·
热电转换
·
固态化学
·
功能材料
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
C.B. Song,Y.L. Zhao,D.M. Song,L. Zhu,X.Q. Gu,Y.H. Qiang
Dye-sensitized solar cells (DSSCs) based on TiO2 nanotube/nanoparticle (NT/NP) photoanodes and Cu2SnSe3 (CTSe) counter electrodes were fabricated. The effect of the thickness of the CTSe films on the DSSC performance was investigated. It was found that DSSC efficiencies firstly increased and then decreased with increasing the film thickness. The optimized DSSC efficiency of 3.14% was achieved at a suitable film thickness (2.9 μm). This work presents a new approach for developing low-cost alternative for expensive Pt in TiO2-nanotube-based DSSCs.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2013
·Vol. 29
·期 11
·2339-2344
·
IF 0.869
ZHU Lei,QIANG Ying-Huai,ZHAO Yu-Long,GU Xiu-Quan,SONG Duan-Ming,SONG Chang-Bin
Cu2SnSe3 (CTSe) nanoparticles with diameters of 150-250 nm were synthesized by a facile solvothermal method. The nanoparticles drop-casted onto fluorine dope tin oxide (FTO) substrate were used as counter electrode in dye-sensitized solar cells (DSSCs). The morphology,
structure and composition of the CTSe nanoparticles were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, and energy dispersive X-ray spectroscopy (EDS). The results indicated the formation
of the nanoparticles with a single crystal phase and approximately stoichiometric composition. DSSCs fabricated with the CTSe-based counter electrodes exhibited a power conversion efficiency of 7.75%, which is similar to that of Ptbased devices (7.21%). The current-voltage curves of the DSSCs
demonstrated that the thickness of the CTSe layer strongly influenced the photocurrent density and fill factor as a result of changes in the number of electrocatalytic sites and the resistance of the layers. Electrochemical impedance spectroscopy (EIS) measurements were performed and the results
indicated that CTSe exhibited Pt-like electrocatalytic activity for the reduction of I3
- to I- in DSSCs. This work presents a new approach for expanding the possibilities for developing low-cost DSSCs that do not require expensive and rare Pt counter electrodes.
研究领域:
材料科学
·
可再生能源
·
纳米技术
·
光伏
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2013
·
IF 2.39
Ji-Ming Song,Yu Liu,He-Lin Niu,Chang-Jie Mao,Long-Jiu Cheng,Sheng-Yi Zhang,Yu-Hua Shen
Cu 2 SnSe 3 (copper tin selenide, CTSe) is one of promising copper-based selenides materials in the use of acousto-optic and photovoltaic fields. In this communication, the CTSe nanocrystals was successfully synthesized by a “hot-injection” protocol in the presence of oleylamine (OLA). Selenium powder dissolved in the mixed solution of OLA and dodecanethiol (DT) were injected into a hot solution of OLA, including copper chloride, tin chloride, at a given reaction temperature. The structure, composition and morphology of the synthesized samples were characterized via using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and field-emission scanning electron microscopy (SEM). The results revealed that the as-synthesized nanocrystals were single phase polycrystalline, cubic crystal structure, and high monodispersity with an average diameter of 5 nm. The thermoelectric properties of these dense materials compacted from nanocrystals with the temperature range from 300 K to 598 K were studied. The results exhibit a promising figure-of-merit ZT at 598 K, and it demonstrates that the prepared CTSe could potentially be useful for efficient thermoelectric materials.
研究领域:
材料科学
·
纳米技术
·
物理化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Hongwei Ming,Chen Zhu,Xiaoying Qin,Jian Zhang,Di Li,Baoli Zhang,Tao Chen,Jimin Li,Xunuo Lou,Hongxin Xin
As an ecofriendly thermoelectric material with intrinsic low thermal conductivity, ternary diamond-like Cu2SnSe3 (CSS) has attracted much attention. Nevertheless, its figure of merit, ZT, is limited by its small thermopower (S) and power factor (PF). Here, we show that an increase in thermopower by 63% and a carrier-mobility rise of 81% at 300 K can be simultaneously achieved through 5% substitution of Fe for Sn due to both enhancement of electronic density of states and degeneracy of multiple valence band maxima, which lead to high PF = 10.3 μW·cm–1·K–2 at 823 K for Fe-doped CSS (CSFS). Besides, an ultrahigh PF of 14.8 μW·cm–1·K–2 (at 773 K) and 45% reduction of lattice thermal conductivity (at 823 K) are realized for CSFS-based composites with 0.125 wt % of MgO nanoinclusions, owing to further enhancement of S via energy-dependent scattering and strong phonon scattering by the embedded nanoparticles. Consequently, a maximum ZT = 1 at 823 K is reached for the CSFS/f MgO composite samples with f = 0.125 wt %, which is around 2.5 times larger than that of the CSS compound.
研究领域:
材料科学
·
热电学
·
能量转换
·
半导体物理
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Songtao Dong,Tian-yu Zhang,Jing Luan,Honglei Wang,Lei Wang,Hongbo Ju
As a viable p-type thermoelectric (TE) material, Cu 2 SnSe 3 has attracted increasing attention, primarily due to its moderate band gap and tunable electronic structure. Nevertheless, its practical TE utilization is significantly limited by its inherently high lattice thermal conductivity ( κ l ) and suboptimal power factor. Herein, a Fe/Mn co-doping strategy is proposed to concomitantly regulate electrical and thermal transport properties, thereby achieving a remarkable improvement in the overall TE performance. A series of Cu 2 Sn 1–2x Fe x Mn x Se 3 (x = 0, 0.02, 0.04, 0.06) ceramic samples were fabricated via vacuum-based melting followed by hot-press sintering, which concurrently introduced abundant lattice defects and a CuSe secondary phase. These multi-scale structural features significantly enhance phonon scattering, causing a substantial reduction in thermal conductivity. Consequently, the total thermal conductivity of Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3 is reduced to a minimum value of 0.432 W m −1 K −1 at 773 K. Meanwhile, Fe/Mn co-doping notably increases the charge carrier concentration ( n ), resulting in a dramatic enhancement in electrical conductivity—from 189.8 S cm −1 for Cu 2 SnSe 3 to 1381 S cm −1 for Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3. Although the Seebeck coefficient exhibites a slight to moderate reduction, the significant increase in electrical conductivity prevails, yielding a substantially optimized power factor ( PF ). A maximum PF of 500.1 μW m −1 K −2 was achieved, together with a peak ZT value of 0.89 at 773 K, representing a 5.23-fold enhancement compared to the undoped Cu 2 SnSe 3 sample ( ZT = 0.17). In addition to enhancing thermoelectric performance, Fe/Mn co-doping significantly improves the mechanical of Cu 2 SnSe 3 . Specifically, the Young’s modulus ( E ) and hardness ( H ) of Cu 2 Sn 0.92 Fe 0.04 Mn 0.04 Se 3 increased by 18.2% and 25.2%, respectively, relative to the undoped sample—demonstrating markedly enhanced mechanical robustness. These results establish Fe/Mn co-doping as an effective and versatile strategy for decoupling electrical and thermal transport in Cu 2 SnSe 3 -based materials, thereby providing a promising pathway toward high-performance thermoelectric materials with superior structural integrity.
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