Flexible Bi2Te3-based thermoelectric generator with an ultra-high power density

You, Han; Li, Zhenming; Shao, Yuying; Yuan, Xiong; Liu, Wei; Tang, Hao; Zhang, Qiqi; Yan, Yonggao; Tang, Xinfeng

doi:10.1016/j.applthermaleng.2021.117818

Cited by 57 publications

(30 citation statements)

References 46 publications

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“…Flexible thermoelectric (TE) technology can convert body heat into electricity to power wearable electronics, which is attracting great interests from both academia and industry. [ 1 , 2 , 3 , 4 , 5 ] Flexible TE technology requires high performance flexible TE materials to fabricate high power density flexible TE device. The performance of TE materials can be evaluated by the figure‐of‐merit zT = S 2 σT / κ , where S , σ , κ , and T are Seebeck coefficient, electrical conductivity, thermal conductivity, and absolute temperature, respectively.…”

Section: Introductionmentioning

confidence: 99%

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

et al. 2022

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The recently discovered ductile/plastic inorganic semiconductors pave a new avenue toward flexible thermoelectrics. However, the power factors of current ductile/plastic inorganic semiconductors are usually low (below 5 μW cm −1 K −2 ) as compared with classic brittle inorganic thermoelectric materials, which greatly limit the electrical output power for flexible thermoelectrics. Here, large plasticity and high power factor in bulk two-dimensional van der Waals (2D vdW) single-crystalline SnSe 2 are reported. SnSe 2 crystals exhibit large plastic strains at room temperature and they can be morphed into various shapes without cracking, which is well captured by the inherent large deformability factor. As a semiconductor, the electrical transport properties of SnSe 2 can be readily tuned in a wide range by doping a tiny amount of halogen elements. A high power factor of 10.8 μW cm −1 K −2 at 375 K along the in-plane direction is achieved in plastic single-crystalline Br-doped SnSe 2 , which is the highest value among the reported flexible inorganic and organic thermoelectric materials. Combining the good plasticity, excellent power factors, as well as low-cost and nontoxic elements, bulk 2D vdW single-crystalline SnSe 2 shows great promise to achieve high power density for flexible thermoelectrics.

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Section: Introductionmentioning

confidence: 99%

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

et al. 2022

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“…Generally, flexible devices are mainly used at near room-temperature so traditional Bi 2 Te 3 -based materials with the highest room-temperature thermoelectric performance are still preferred for FTG. 20 However, their rigid mechanical property and toxicity limit their applications. Although many new promising thermoelectric materials have been found in the last few decades, most of them have low ZT values at near room-temperature, especially in n-type materials.…”

Section: Introductionmentioning

confidence: 99%

Significantly (00l)-textured Ag₂Se thin films with excellent thermoelectric performance for flexible power applications

Zheng

Niu

et al. 2022

J. Mater. Chem. A

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“…At ΔT = 14, 21, and 28 K, the power density for SCO9 reads 1.1, 2.6, and 4.5 W m −2 , respectively. The normalized power density is thereby calculated between 0.56 and 0.59 µW K −2 cm −2 , which ranks the top level among those reported Bi 2 Te 3 and Bi 2 Te 3 -based film devices, [40][41][42][43] see Figure S7, Supporting Information.…”

Section: Resultsmentioning

confidence: 93%

Converting Brownmillerite to Alternate Layers of Oxygen‐Deficient and Conductive Nano‐Sheets with Enhanced Thermoelectric Properties

Han

et al. 2022

Advanced Energy Materials

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Introducing large oxygen deficiencies while retaining low resistivity is important for enhancing the overall thermoelectric properties in 3d transition‐metal oxides. In this study, a new synthesis route to reconstruct the insulating brownmillerite SrCoO2.5 is adapted. Through a step‐by‐step nano‐blocks modification, a series of highly‐conductive layered structures is evolved, which are [Sr2O2H2]0.5CoO2, [Sr2O2]0.4CoO2, and [Sr2CoO3]0.57CoO2, while still retaining considerable Seebeck coefficient (≈100 µV K−1). Coexistence of low resistivity and high oxygen deficiency is realized in the latter two polymorphs by forming a majority of sintered oxygen vacancies in the rock‐salt layer and a minority of normal oxygen vacancies in the CoO2 layer. A room‐temperature in‐plane power factor of 3.6 mW K−2 m−1, power output density of 4.5 W m−2 at a temperature difference of 28 K, and an out‐of‐plane thermal conductivity of 0.33 W K−1 m−1 are obtained in the [Sr2O2]0.4CoO2 thin film that exhibits the highest oxygen deficiency (δ = 2.95), which is on par with Bi2Te3, the benchmark. It is pointed out that proper distribution of oxygen vacancy is essential in tailoring the physical and chemical properties of transition‐metal oxides. The sintered/normal oxygen vacancy layer model provides guidance to the exploration of materials with both low electric resistivity and thermal conductivity.

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Flexible Bi2Te3-based thermoelectric generator with an ultra-high power density

Cited by 57 publications

References 46 publications

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

Significantly (00l)-textured Ag₂Se thin films with excellent thermoelectric performance for flexible power applications

Converting Brownmillerite to Alternate Layers of Oxygen‐Deficient and Conductive Nano‐Sheets with Enhanced Thermoelectric Properties

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Flexible Bi2Te3-based thermoelectric generator with an ultra-high power density

Cited by 57 publications

References 46 publications

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe2 for Flexible Thermoelectrics

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe2 for Flexible Thermoelectrics

Significantly (00l)-textured Ag2Se thin films with excellent thermoelectric performance for flexible power applications

Converting Brownmillerite to Alternate Layers of Oxygen‐Deficient and Conductive Nano‐Sheets with Enhanced Thermoelectric Properties

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Product

Resources

About

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

Plastic/Ductile Bulk 2D van der Waals Single‐Crystalline SnSe₂ for Flexible Thermoelectrics

Significantly (00l)-textured Ag₂Se thin films with excellent thermoelectric performance for flexible power applications