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| Open AccessN-type organic thermoelectrics: demonstration of ZT > 0.3
Achieved high thermoelectric figure of merit (ZT) in organic thermoelectric materials remains a challenge due to their low packing order and poor host/dopant miscibility. Here, the authors report side chain-engineered n-doped fullerene derivatives with record ZT >0.3 for organic thermoelectrics.
- Jian Liu
- , Bas van der Zee
- & L. Jan Anton Koster
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| Open AccessDimer rattling mode induced low thermal conductivity in an excellent acoustic conductor
CuP2 has a puzzling thermal transport behavior, with low thermal conductivity but quite large mean sound speeds. Here, the authors conduct a systematical study of the atomic structure and lattice dynamics of CuP2 to reveal the origin, finding a dimer rattling behavior.
- Ji Qi
- , Baojuan Dong
- & Zhidong Zhang
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| Open AccessSi0.97Ge0.03 microelectronic thermoelectric generators with high power and voltage densities
Thermoelectric generators with a small size are unable to produce enough high voltage and power levels to run Si integrated circuits using commonly encountered temperature differences. Here, the authors present microelectronic thermoelectric generators using Si0.97Ge0.03 to solve the problem.
- Ruchika Dhawan
- , Prabuddha Madusanka
- & Mark Lee
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| Open AccessEstablishing the carrier scattering phase diagram for ZrNiSn-based half-Heusler thermoelectric materials
Chemical doping plays an important role in tuning carrier concentration of materials, but its influence on other aspects of electrical properties is less known. Here, the authors find that chemical doping brings strong screening effects to ionized impurities, grain boundary, and polar optical phonon scattering.
- Qingyong Ren
- , Chenguang Fu
- & Jie Ma
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| Open AccessIntegrated near-field thermo-photovoltaics for heat recycling
Designing a scalable platform to generate electricity from the energy exchange mechanism between two surfaces separated by nanometer distances remains a challenge. Here, the authors demonstrate reconfigurable, scalable and fully integrated near-field thermo-photovoltaics for on-demand heat recycling.
- Gaurang R. Bhatt
- , Bo Zhao
- & Michal Lipson
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| Open AccessCorrelating charge and thermoelectric transport to paracrystallinity in conducting polymers
Obtaining a complete picture for charge transport in conducting polymers is vital to designing new organic electronic materials. Here, the authors show that a gaussian density of states clarifies the transport physics in conducting polymers by revealing the role of carrier scattering on transport.
- Anas Abutaha
- , Pawan Kumar
- & Kedar Hippalgaonkar
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| Open AccessStretchable fabric generates electric power from woven thermoelectric fibers
Despite recent advances in flexible thermoelectric generators for wearable devices, current designs are unable to efficiently harvest heat flowing from human body. Here, the authors report high thermoelectric performance and stretchability in interlocked fiber-based modules for wearable devices.
- Tingting Sun
- , Beiying Zhou
- & Gerald Jeffrey Snyder
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| Open AccessMagneto-optical painting of heat current
Spin caloritronics offers advantages for the thermal management of spintronic devices. Here, the authors demonstrate that the direction of heat currents generated by spin-caloritronic phenomena can be changed by illuminating magnetic materials with visible light.
- Jian Wang
- , Yukiko K. Takahashi
- & Ken-ichi Uchida
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| Open AccessDirect thermal charging cell for converting low-grade heat to electricity
Recovery of low-grade heat can aid in reducing greenhouse gas emissions, but heat-to-electricity conversion technologies should be optimized. Here the authors report a direct thermal charging cell that uses asymmetric electrodes and a redox electrolyte to efficiently convert low-grade heat into electricity.
- Xun Wang
- , Yu-Ting Huang
- & Shien-Ping Feng
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| Open AccessUltra-high performance wearable thermoelectric coolers with less materials
Wearable thermoelectric coolers (TECs), whose performance depends on optimal module design and environmental thermal resistance, are an attractive next-generation technology for on-body applications. Here, the authors report an optimized wearable TEC with 170% higher cooling than commercial devices.
- Ravi Anant Kishore
- , Amin Nozariasbmarz
- & Shashank Priya
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| Open AccessPolymer gels with tunable ionic Seebeck coefficient for ultra-sensitive printed thermopiles
Though polymer electrolytes with high ionic Seebeck coefficients are attractive for thermoelectric modules, demonstrating high performance n-type polymers required for modules remains elusive. Here, the authors report ambipolar ionic polymer gels with high ionic Seebeck coefficient.
- Dan Zhao
- , Anna Martinelli
- & Xavier Crispin
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| Open AccessComposition change-driven texturing and doping in solution-processed SnSe thermoelectric thin films
Despite significant efforts to improve the thermoelectric properties of polycrystalline SnSe, precise control of texturing and doping is a challenge. Here, the authors report hole doped and highly textured SnSe thin films prepared by low cost, scalable solution processing.
- Seung Hwae Heo
- , Seungki Jo
- & Jae Sung Son
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| Open AccessDiscovery of colossal Seebeck effect in metallic Cu2Se
Recent research efforts have aimed at discovering thermoelectric materials with high efficiency in the middle-low temperature range, where a majority of waste heat is lost to the ambient. Here, the authors discover colossal Seebeck coefficient values in metallic copper selenide from 340 K to 400 K.
- Dogyun Byeon
- , Robert Sobota
- & Tsunehiro Takeuchi
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| Open AccessPolymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics
To realize the potential of soft hybrid (inorganic-organic) materials for thermoelectrics, the underlying transport-related physics must be understood. Here, the authors extend the Kang-Synder framework with experimental analysis to gain insight on the thermoelectric transport in hybrid materials.
- Pawan Kumar
- , Edmond W. Zaia
- & Kedar Hippalgaonkar
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| Open AccessLarge-area and adaptable electrospun silicon-based thermoelectric nanomaterials with high energy conversion efficiencies
To realize waste heat recovery solutions based on thermoelectricity, high-performance materials with device and manufacturing compatibility are required. Here, the authors demonstrate large-area paper-like nanostructured fabrics consisting of aligned nanotubes with high thermoelectric performance.
- Alex Morata
- , Mercè Pacios
- & Albert Tarancón
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| Open AccessSuppression of atom motion and metal deposition in mixed ionic electronic conductors
Mixed ionic–electronic conductors are limited by material decomposition. Here the authors reveal the mechanism for atom migration and deposition in Cu2–δ(S,Se) materials based on a critical chemical potential difference and propose electronically conducting, ion-blocking interfaces to enhance stability.
- Pengfei Qiu
- , Matthias T. Agne
- & G. Jeffrey Snyder
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| Open AccessDouble thermoelectric power factor of a 2D electron system
The accelerated growth of thermoelectric technology that efficiently converts waste heat to electricity necessitates the development of high-performance materials. Here, the authors experimentally demonstrate a 2D electron system with enhanced two-dimensionality and thermoelectric power factor.
- Yuqiao Zhang
- , Bin Feng
- & Hiromichi Ohta
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| Open AccessDefects controlled hole doping and multivalley transport in SnSe single crystals
Knowledge of the electronic structure of group-IV monochalcogenides is essential for their application in high-performance thermoelectric energy harvesting. Here, using photoemission spectroscopy, the authors reveal the impact of doping, and the anisotropic nature of the band structure of SnSe.
- Zhen Wang
- , Congcong Fan
- & Yi Zheng
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| Open AccessExperimental study of thermal rectification in suspended monolayer graphene
Thermal rectification is instrumental to achieving active heat flow control and energy harvesting in nanoscale devices. Here, the authors demonstrate thermal rectification in asymmetric graphene nanostructures, achieving a large rectification factor up to 26%.
- Haidong Wang
- , Shiqian Hu
- & Jie Chen
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| Open AccessHigh-performance and compact-designed flexible thermoelectric modules enabled by a reticulate carbon nanotube architecture
Thermoelectric modules can generate electricity directly from heat and have applications to waste heat-energy conversion. Here Zhouet al. have fabricated a thermoelectric module based on an air-stable n-type single-walled carbon nanotube sheet which can reach a high power factor of 1500 μWm−1K−2.
- Wenbin Zhou
- , Qingxia Fan
- & Sishen Xie
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| Open AccessHigh-performance shape-engineerable thermoelectric painting
Thermoelectric devices are often rigid and do not adapt conformally to surfaces. Here, Park et al. prepare a Bi2Te3-based thermoelectric paint, containing a Sb2Te3chalcogenidometalate additive, that can be paint-brushed onto curved surfaces and form thermoelectric modules with good efficiencies.
- Sung Hoon Park
- , Seungki Jo
- & Jae Sung Son
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| Open AccessThermally enhanced photoluminescence for heat harvesting in photovoltaics
In photovoltaics, sub-band gap energy photons can be harvested using up-conversion strategies. Here, the authors show that the thermally enhanced up-converted photoluminescence results in enhanced energy conversion, for an accessible temperature range and with a broad range of incident photon energy.
- Assaf Manor
- , Nimrod Kruger
- & Carmel Rotschild
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| Open AccessPhoto-excited charge carriers suppress sub-terahertz phonon mode in silicon at room temperature
Direct measurement of electron-phonon interactions at the single-mode level has been a challenge. Here, Liaoet al. use a three-pulse photoacoustic spectroscopy technique to investigate the damping of a single sub-terahertz coherent phonon mode by photo-excited free charge carriers in silicon at room temperature.
- Bolin Liao
- , A. A. Maznev
- & Gang Chen