Enhanced thermoelectric performance of rough silicon nanowires

Chen, Renkun; Hochbaum, Allon I.; Delgado, Raul Diaz; Liang, Wenjie; Garnett, Erik C.; Najarian, Mark; Majumdar, Arun; Yang, Peidong

doi:10.1142/9789814317665_0017

Cited by 233 publications

(365 citation statements)

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“…In the past two decades, tremendous exploratory efforts have been made to improve zTs [8][9][10][11][12][13][14][15][16][17]. High thermoelectric performance is usually reported in either single crystals or nano-materials, which are the two extreme crystallization regimes [16][17][18][19].…”

Section: T/(ρκ) Where S T ρ and κmentioning

confidence: 99%

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

et al. 2017

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Mosaic-crystal microstructure is one of the optimal strategies for decoupling and balancing thermal and electrical transport properties in thermoelectric materials. Herein, we successfully achieve the desired nanoscale mosaic structures in triple-component Cu2-yS1/3Se1/3Te1/3 solid solutions using Cu2S, Cu2Se, and Cu2Te matrix compounds. They are solved in hexagonal structures with space group R3 ̅ m by means of single crystal structural solution and Rietveld refinement. Electron backscatter diffraction measurements show that all the samples are polycrystalline compounds with the grain size in the range of micrometers. However, transmission electron microscopic study reveals that these microscale grains are quasi-single crystals consist of a variety of 10-30 nm mosaic grains. Each mosaic grain is a perfect crystal but titled or rotated with respect to others by a very small angle. In this case, excellent electrical transports are maintained but exceptional low thermal conductivity is achieved throughout the whole temperature range, which is attributed to the combined phonon scatterings by point defects, liquid-like copper ions, and lattice strains or interfaces of mosaic nanograins. Combining all these favorable factors, remarkably high thermoelectric performance is achieved in Cu1.98S1/3Se1/3Te1/3 2 with a maximum zT of 1.9 at 1000 K.

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Section: T/(ρκ) Where S T ρ and κmentioning

confidence: 99%

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

et al. 2017

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“…The TERM consists of a heat spreader, a TEG, and a heat sink. Established thermoelectric materials are bismuth telluride (Bi2Te3)-type materials, lead telluride (PbTe), and silicon germanium alloys [23], and research continues to be undertaken in the pursuit of new materials [8,9,10,26]. Forced air convection techniques are utilized to control the temperatures of all the electrical components, including transistors, in typical PAs.…”

Section: Fully Coupled Thermoelectric Modelmentioning

confidence: 99%

“…Hence, recent studies have focused on the development of novel thermoelectric materials with better figures of merit (zT), e.g., a PbSeTe/PbTe quantum dot superlattice structure [8], a p-type Bi2Te3/Sb2Te3 superlattice device [26], an AgPbmSbTe2ϩm material [10], and a silicon nanowires structure [2,9]. However, due to the practical difficulties in scaling and manufacturing, advanced material and novel structure based TEGs are not yet used in real applications.…”

Section: Introductionmentioning

confidence: 99%

Energy scavenging for energy efficiency in networks and applications

Kim¹,

Cottone

Goyal

et al. 2010

Bell Labs Tech. J.

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Telecommunication networks will play a huge part in enabling ecosustainability of human activity; one of the first steps towards this is to dramatically increase network energy efficiency. In this paper we present two novel approaches for energy scavenging in networks. One involves thermal energy scavenging for improving wireless base station energy efficiency, and the other involves mechanical energy scavenging for powering sensors in sensor networks, for machine-to-machine (M2M) communications, and for smart grid applications. Power amplifier (PA) transistors in base stations waste 30 percent of the total energy used in a wireless access network (WAN) as heat to the environment. We propose a thermoelectric energy recovery module (TERM) to recover electricity from the waste heat of PA transistors. A fully coupled thermoelectric (TE) model, combining thermoelectricity and heat transfer physics, is developed to explore the power generation performance and efficiency as well as the thermal performance of the TERM. The TE model is comprehensively used to determine optimized pellet geometries for power generation and efficiency as a function of PA transistor heat dissipation, heat sink performance, and load resistance. Maximum power generation and efficiency for various parametric conditions are also explored. Untapped kinetic energy is almost everywhere in the form of vibrations. This energy can be converted into electrical energy by means of transducers to power wireless sensors and mobile electronics in the range of microwatts to a few milliwatts. However, many problems limit the efficiency of current harvesting generators: narrow bandwidth, low power density, micro-electro-mechanical system (MEMS) scaling, and inconsistency of vibrating sources. We explore energy scavenger designs based on multiple-mass systems to increase harvesting efficiency. A theoretical and experimental study of two degrees-of-freedom (2-DOF) vibration-powered generators is presented. Both electromagnetic and piezoelectric conversion methods are modeled by using a general approach. Experimental results for the multi-resonant system are in agreement with the analytical predictions and demonstrate significantly better performance in terms of maximum power density per total mass and a wider bandwidth compared to single DOF (1-DOF) generators.

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“…Attempts to increase battery lifetime with energy-harvesting include alternative power sources not limited to thermoelectric [5], piezoelectric [6]- [8], biopotential [9] and glucose [10], [11] harvesting. However, these methods are anatomically specific and yield power densities too low for powering a small bioelectronic device.…”

Section: Introductionmentioning

confidence: 99%

Midfield Wireless Power Transfer for Bioelectronics

Poon

2015

IEEE Circuits Syst. Mag.

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midfield wireless powering enables electronics to be designed at the millimeter-scale and operated at nearly any location in the body. theoretical studies show a wireless power transfer paradigm with a maximum bound orders of magnitude higher than conventional near-field inductive coupling. Furthermore, higher frequency of operation for midfield coupling lends itself to miniaturization of the implant. midfield powering experiments using an external patterned metal structure and a millimeter sized coil show significant power delivery within safe levels of tissue heating in the chest and the head of a porcine model, and will enable implantable bioelectronics to reach new levels of functionality and one day to become as ubiquitous as over-the-counter pharmaceuticals.

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Enhanced thermoelectric performance of rough silicon nanowires

Cited by 233 publications

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High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

High thermoelectric performance and low thermal conductivity in Cu2−yS1/3Se1/3Te1/3 liquid-like materials with nanoscale mosaic structures

Energy scavenging for energy efficiency in networks and applications

Midfield Wireless Power Transfer for Bioelectronics

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