Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering

Ge, Zhen‐Hua; Song, Dongsheng; Chong, Xiaoyu; Zheng, Fengshan; Jin, Lei; Qian, Xin; Liu, Zheng; Dunin-Borkowski, Rafal E.; Qin, Peng; Feng, Jing; Zhao, Li‐Dong

doi:10.1021/jacs.7b05339

Cited by 173 publications

(144 citation statements)

References 31 publications

Supporting

Mentioning

132

Contrasting

Unclassified

Order By: Relevance

“…Although the doping with alkaline metals Na and/or K achieved by traditional melting routes can also tune p and in turn achieve high ZTs in SnSe,29,33,42 much weak mechanical properties are often resulted in doped alkaline metals, that limits the applications of polycrystalline SnSe in real thermoelectric devices, mainly caused by the high activities of these alkaline metals 3. However, solvothermal is a good choice to meet the goal of simultaneously improving the thermoelectric and mechanical properties.…”

Section: Vacancy Engineeringmentioning

confidence: 99%

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

2020

View full text Add to dashboard Cite

Tin selenide (SnSe) is one of the most promising candidates to realize environmentally friendly, cost‐effective, and high‐performance thermoelectrics, derived from its outstanding electrical transport properties by appropriate bandgaps and intrinsic low lattice thermal conductivity from its anharmonic layered structure. Advanced aqueous synthesis possesses various unique advantages including convenient morphology control, exceptional high doping solubility, and distinctive vacancy engineering. Considering that there is an urgent demand for a comprehensive survey on the aqueous synthesis technique applied to thermoelectric SnSe, herein, a thorough overview of aqueous synthesis, characterization, and thermoelectric performance in SnSe is provided. New insights into the aqueous synthesis‐based strategies for improving the performance are provided, including vacancy synergy, crystallization design, solubility breakthrough, and local lattice imperfection engineering, and an attempt to build the inherent links between the aqueous synthesis‐induced structural characteristics and the excellent thermoelectric performance is presented. Furthermore, the significant advantages and potentials of an aqueous synthesis route for fabricating SnSe‐based 2D thermoelectric generators, including nanorods, nanobelts, and nanosheets, are also discussed. Finally, the controversy, strategy, and outlook toward future enhancement of SnSe‐based thermoelectric materials are also provided. This Review guides the design of thermoelectric SnSe with high performance and provides new perspectives as a reference for other thermoelectric systems.

show abstract

Section: Vacancy Engineeringmentioning

confidence: 99%

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

2020

View full text Add to dashboard Cite

show abstract

“…The energetic preference of Ag and Na being close together in the lattice versus being separated was examined. [24,37] [42] Sn 0.98 Ag 0.01 Na 0.01 Se, SnSe-STSe, and Sn 0.99 Na 0.01 Se-STSe samples, respectively. Then we further confirmed this by comparing the energy of (Figure 3c) shows complex multivalence band states near the Fermi level, the corresponding valence band maximum (VBM) points are marked as N = 1, 2, 3, 4, 5, and 6 with a slight downward trend in energy.…”

Section: Defect Analysismentioning

confidence: 99%

High Thermoelectric Performance in Polycrystalline SnSe Via Dual‐Doping with Ag/Na and Nanostructuring With Ag₈SnSe₆

Luo

Cai

Hua

et al. 2018

Advanced Energy Materials

103

View full text Add to dashboard Cite

Single crystalline SnSe is one of the most intriguing new thermoelectric materials but the thermoelectric performance of polycrystalline SnSe seems to lag significantly compared to that of a single crystal. Here an effective strategy for enhancing the thermoelectric performance of p‐type polycrystalline SnSe by Ag/Na dual‐doping and Ag8SnSe6 (STSe) nanoprecipitates is reported. The Ag/Na dual‐doping leads to a two orders of magnitude increase in carrier concentration and a convergence of valence bands (VBM1 and VBM5), which in turn results in sharp enhancement of electrical conductivities and high Seebeck coefficients in the Ag/Na dual‐doped samples. Additionally, the SnSe matrix becomes nanostructured with dispersed nanoprecipitates of the compound Ag8SnSe6, which further strengthens the scattering of phonons. Specifically, ≈20% reduction in the already ultralow lattice thermal conductivity is realized for the Sn0.99Na0.01Se–STSe sample at 773 K compared to the thermal conductivity of pure SnSe. Consequently, a peak thermoelectric figure of merit ZT of 1.33 at 773 K with a high average ZT (ZTave) value of 0.91 (423–823 K) is achieved for the Sn0.99Na0.01Se–STSe sample.

show abstract

“…experiment [34] [38] [35] The Seebeck coefficient S versus total hole density p at room temperature calculated with an energy independent scattering approximation and a scattering time τ ∝ E −1.3 . Comparison is made against experimental measurements of Seebeck coefficient [9,11,[34][35][36][37][38].…”

Section: Magnetoresistancementioning

confidence: 99%

Quasi-two-dimensional thermoelectricity in SnSe

et al. 2018

View full text Add to dashboard Cite

Stannous selenide is a layered semiconductor that is a polar analogue of black phosphorus, and of great interest as a thermoelectric material. Unusually, hole doped SnSe supports a large Seebeck coefficient at high conductivity, which has not been explained to date. Angle resolved photo-emission spectroscopy, optical reflection spectroscopy and magnetotransport measurements reveal a multiplevalley valence band structure and a quasi two-dimensional dispersion, realizing a Hicks-Dresselhaus thermoelectric contributing to the high Seebeck coefficient at high carrier density. We further demonstrate that the hole accumulation layer in exfoliated SnSe transistors exhibits a field effect mobility of up to 250 cm 2 /Vs at T = 1.3 K. SnSe is thus found to be a high quality, quasi twodimensional semiconductor ideal for thermoelectric applications. arXiv:1802.08069v1 [cond-mat.mtrl-sci]

show abstract

Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering

Cited by 173 publications

References 31 publications

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

High Thermoelectric Performance in Polycrystalline SnSe Via Dual‐Doping with Ag/Na and Nanostructuring With Ag₈SnSe₆

Quasi-two-dimensional thermoelectricity in SnSe

Contact Info

Product

Resources

About

Boosting the Thermoelectric Performance of (Na,K)-Codoped Polycrystalline SnSe by Synergistic Tailoring of the Band Structure and Atomic-Scale Defect Phonon Scattering

Cited by 173 publications

References 31 publications

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

High‐Performance Thermoelectric SnSe: Aqueous Synthesis, Innovations, and Challenges

High Thermoelectric Performance in Polycrystalline SnSe Via Dual‐Doping with Ag/Na and Nanostructuring With Ag8SnSe6

Quasi-two-dimensional thermoelectricity in SnSe

Contact Info

Product

Resources

About

High Thermoelectric Performance in Polycrystalline SnSe Via Dual‐Doping with Ag/Na and Nanostructuring With Ag₈SnSe₆