Inkjet Printed Large‐Area Flexible Few‐Layer Graphene Thermoelectrics

Juntunen, Taneli; Jussila, Henri; Ruoho, Mikko; Liu, Shouhu; Hu, Guohua; Albrow-Owen, Tom; Ng, Leonard W. T.; Howe, Richard C. T.; Hasan, Tawfique; Sun, Zhipei; Tittonen, Ilkka

doi:10.1002/adfm.201800480

Cited by 146 publications

(136 citation statements)

References 54 publications

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Section: Flexibility Of Tegsmentioning

confidence: 99%

“…Figure e,f displays two kinds of flexible TEGs that are made of transparent thin film of polycrystalline CuI and few‐layer graphene film, respectively. As TE materials, polycrystalline CuI and few‐layer graphene are deposited on flexible substrates by sputtering and inkjet printing . These kinds of TEGs show excellent flexibility, including bending and torsion, thermostability, and durability of mechanical antideformations.…”

Section: Flexibility Of Tegsmentioning

confidence: 99%

“…Various kinds of TEGs can achieve power generation and heating/refrigeration, showing many merits such as high sensitivity to temperature change and emission‐free operation. These advantages enable TEGs to be utilized in different fields, including self‐powered sensor systems, automotive and control devices, water condensation, and implantable/wearable electronics …”

Section: Applications Of Tegsmentioning

confidence: 99%

“…Recently, flexible TEGs have gradually attracted increasing attention in the novel research works and potential applications. According to the deformation characteristics, flexible TEGs specifically include stretchable, compressible, and bendable TEGs, among others . Furthermore, most of them possess the characteristics of light weight, small volume, easy to carry, and low production cost.…”

Section: Introductionmentioning

confidence: 99%

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Design, Performance, and Application of Thermoelectric Nanogenerators

Zhang

Wang

Yang

2019

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Thermal energy harvesting from the ambient environment through thermoelectric nanogenerators (TEGs) is an ideal way to realize self‐powered operation of electronics, and even relieve the energy crisis and environmental degradation. As one of the most significant energy‐related technologies, TEGs have exhibited excellent thermoelectric performance and played an increasingly important role in harvesting and converting heat into electric energy, gradually becoming one of the hot research fields. Here, the development of TEGs including materials optimization, structural designs, and potential applications, even the opportunities, challenges, and the future development direction, is analyzed and summarized. Materials optimization and structural designs of flexibility for potential applications in wearable electronics are systematically discussed. With the development of flexible and wearable electronic equipment, flexible TEGs show increasingly great application prospects in artificial intelligence, self‐powered sensing systems, and other fields in the future.

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Section: Flexibility Of Tegsmentioning

confidence: 99%

Section: Flexibility Of Tegsmentioning

confidence: 99%

Section: Applications Of Tegsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design, Performance, and Application of Thermoelectric Nanogenerators

Zhang

Wang

Yang

2019

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confidence: 99%

3D Printing of Solution‐Processable 2D Nanoplates and 1D Nanorods for Flexible Thermoelectrics with Ultrahigh Power Factor at Low‐Medium Temperatures

et al. 2019

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graphene, [10] conductive polymer, and hybrids, [11] have the ability to interconvert thermal to electrical energy without moving parts. These f-TEGs can be integrated with portable/wearable electronics and sensors, and enable selfpowered devices. In this context, V 2 -VI 3 metal chalcogenides (Bi 2 Te 3 , Sb 2 Te 3 , and related alloys and compounds) [1,[12][13][14][15][16][17] have attracted particular attention because of their high figure of merit (ZT) near room temperature. [18] For example, p-type Bi 2 Te 3 -Sb 2 Te 3 alloys show high performance near room temperature and benefit considerably from nanostructuring. [19] Similar to Bi 2 Te 3 , Sb 2 Te 3 is also a topological insulator, [20] which leads to a complex, nonparabolic band structure, often highly favorable for thermoelectric (TE) performance. [21] It has an extremely high dielectric constant of ε 0 ≈ 100, favorable for high mobility even with large concentration of defects. [22][23][24] Thus Sb 2 Te 3 is potentially an important TE material, the key challenge being to find methods to control its carrier concentration and to effectively nanostructure the material while maintaining this control. So far, most of the reported Sb 2 Te 3 related materials are p-type semiconductors. This is caused by intrinsic defects including Sb vacancies and antisite defects of Sb atoms on the Te sites (Sb Te ) [25] that occur during normal synthesis procedures. Typically, Sb 2 Te 3 bulk single crystals stand out for their unique advantages including a high electrical conductivity (σ) around 3-5 × 10 5 S m −1 , and a reasonable thermal conductivity (κ) around 1-6 W m −1 K −1 . However, Sb 2 Te 3 also has a less competitive Seebeck coefficient (S) around 83-105 µV K −1 . This is due to its high degenerate hole concentration (n > 10 20 cm −3 ) created by the acceptor states mentioned above, [26] especially Sb Te . Thus key problem is to find ways to control the doping level and thereby reduce the hole concentration and to determine the extent to which this can lead to enhanced S and TE performance. Nanostructuring has been employed to enhance S, and to reduce κ as a result of the increased phonon scattering effect. [19,[27][28][29][30] For example, Sb 2 Te 3 with 2D nanoplates morphology presents a 30% increase in S (S = 125 µV K −1 ) near room temperature. [31] S and ZT enhancement in nanostructured Solution-processable semiconducting 2D nanoplates and 1D nanorods are attractive building blocks for diverse technologies, including thermoelectrics, optoelectronics, and electronics. However, transforming colloidal nanoparticles into high-performance and flexible devices remains a challenge. For example, flexible films prepared by solution-processed semiconducting nanocrystals are typically plagued by poor thermoelectric and electrical transport properties. Here, a highly scalable 3D conformal additive printing approach to directly convert solution-processed 2D nanoplates and 1D nanorods into high-performing flexible devices is reported. The flexible films printed using Sb ...

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Pyroelectric and Thermoelectric Nanogenerators

2020

Hybridized and Coupled Nanogenerators

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Inkjet Printed Large‐Area Flexible Few‐Layer Graphene Thermoelectrics

Cited by 146 publications

References 54 publications

Design, Performance, and Application of Thermoelectric Nanogenerators

Design, Performance, and Application of Thermoelectric Nanogenerators

3D Printing of Solution‐Processable 2D Nanoplates and 1D Nanorods for Flexible Thermoelectrics with Ultrahigh Power Factor at Low‐Medium Temperatures

Pyroelectric and Thermoelectric Nanogenerators

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