Influence of Compensating Defect Formation on the Doping Efficiency and Thermoelectric Properties of Cu2-ySe1–xBrx

Day, Tristan; Weldert, Kai S.; Zeier, Wolfgang G.; Chen, Bor-Rong; Moffitt, Stephanie L.; Weis, Ulrike; Jochum, Klaus Peter; Panthöfer, Martin; Bedzyk, Michael J.; Snyder, G. Jeffrey; Tremel, Wolfgang

doi:10.1021/acs.chemmater.5b02405

Cited by 68 publications

(84 citation statements)

References 58 publications

(112 reference statements)

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“…Substituting Se (VEC Se = 6) with Br (VEC Br = 7) can reduce VECs and minimize holes for electrons to fill out, releasing extra free electrons and reduced n H . Figure b presents n H as a function of the Br‐doping level (Cu 2 Se 1− x Br x ) and shows that n H is dramatically reduced with increasing the Br‐doping level . Similar effect has also been found in the Cl‐doped Cu 2 Se, in which Cl substitutes Se site .…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 55%

“…Figure a schematically illustrates that introducing Cu vacancies can eliminate the contribution of electrons from Cu atoms (enhancing VECs), leading to additional unfilled holes (the dominating carriers of p‐type Cu 2 X, such as Cu 2 Se) and subsequently enhanced n H . Substituting Se (VEC Se = 6) with Br (VEC Br = 7) can reduce VECs and minimize holes for electrons to fill out, releasing extra free electrons and reduced n H . Figure b presents n H as a function of the Br‐doping level (Cu 2 Se 1− x Br x ) and shows that n H is dramatically reduced with increasing the Br‐doping level .…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

“…a) Schematic diagrams of valence electron counts (VECs) engineering in Cu 2 Se‐based thermoelectric materials via Cu‐vacancy engineering and Br‐doping (substituting Se in Cu 2 Se). b) Influence of Br‐doping on hole concentration ( n H ) of Cu 2 Se 1− x Br x . c) Influence of S‐doping (Cu 2 Se 1− x S x ) on bonding energy (Δ E ) and n H .…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

“…Figure a shows the calculated n H ‐dependent zT at 300 K, plotted with the related experimental results of the pristine Cu 2 Se, Cu 2‐ y Se 1− x Br x and those with overstoichiometric Cu 2+ x Se . As can be seen, n H,opt of Cu 2 Se at 300 K is estimated as ≈1 × 10 20 cm −3 , where a maximum zT (zT max ) of ≈0.55 can be achievable through effective optimization of n H .…”

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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Due to the nature of their liquid‐like behavior and high dimensionless figure of merit, Cu2X (X = Te, Se, and S)‐based thermoelectric materials have attracted extensive attention. The superionicity and Cu disorder at the high temperature can dramatically affect the electronic structure of Cu2X and in turn result in temperature‐dependent carrier‐transport properties. Here, the effective strategies in enhancing the thermoelectric performance of Cu2X‐based thermoelectric materials are summarized, in which the proper optimization of carrier concentration and minimization of the lattice thermal conductivity are the main focus. Then, the stabilities, mechanical properties, and module assembly of Cu2X‐based thermoelectric materials are investigated. Finally, the future directions for further improving the energy conversion efficiency of Cu2X‐based thermoelectric materials are highlighted.

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Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 55%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

Section: Strategies For the Thermoelectric Property Enhancementmentioning

confidence: 99%

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Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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“…[217,218] and their compounds, [219,220] have unique characteristics with ordered anion lattice and statistically distributed cation ions, which leads to the intrinsically high μ [221] and low κ due to strong phonon scattering via cation vacancies and disordering. [42] A concept of "phonon-liquid electron-crystal" [42,104] was proposed to explain the ultralow κ and high TE performance of superionic conductors, which provides a new opportunity on decoupling the S, σ, and κ, soonly boosted the research enthusiasm on superionic TE materials and resulted in many encouraging discoveries including high performance room-temperature β-Ag 2 Se, medium temperature β-Cu 2 Se, [48,72,105,195,222,223] etc.…”

Section: Superionic Conductorsmentioning

confidence: 99%

High Performance Thermoelectric Materials: Progress and Their Applications

Yang

Chen

Dargusch

et al. 2017

Advanced Energy Materials

626

434

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Thermoelectric (TE) materials have the capability of converting heat into electricity, which can improve fuel efficiency, as well as providing robust alternative energy supply in multiple applications by collecting wasted heat, and therefore, assisting in finding new energy solutions. In order to construct high performance TE devices, superior TE materials have to be targeted via various strategies. The development of high performance TE devices can broaden the market of TE application and eventually boost the enthusiasm of TE material research. This review focuses on major novel strategies to achieve high‐performance TE materials and their applications. Manipulating the carrier concentration and band structures of materials are effective in optimizing the electrical transport properties, while nanostructure engineering and defect engineering can greatly reduce the thermal conductivity approaching the amorphous limit. Currently, TE devices are utilized to generate power in remote missions, solar–thermal systems, implantable or/wearable devices, the automotive industry, and many other fields; they are also serving as temperature sensors and controllers or even gas sensors. The future tendency is to synergistically optimize and integrate all the effective factors to further improve the TE performance, so that highly efficient TE materials and devices can be more beneficial to daily lives.

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Thermoelectric Materials

Owens‐Baird

Heinrich

Kovnir

2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The field of thermoelectric materials has flourished over the last two decades. Significant successes achieved in the development of materials notwithstanding, novel and highly efficient materials are in steep demand due to a wide range of potential and current applications, ranging from wearable electronics to space missions. The main challenge in the improvement of the thermoelectric figure of merit ( zT ) is to optimize the intertwined intrinsic charge and thermal transport properties. High electrical conductivity and thermopower, along with low thermal conductivity, need to be achieved simultaneously to excel the thermoelectric efficiency. In this review, the thermoelectric concepts, basics of transport properties, and strategies for zT optimization are discussed in the first section. In the following sections, the predominate structure types associated with high‐performance bulk thermoelectric materials are discussed in detail: Bi 2 Te 3 , PbTe, TAGS/LAST systems, SnSe, Cu 2− x Se, chalcopyrites, tetrahedrites, clathrates, skutterudites, zinc antimonides, Yb 14 MnSb 11 , Heusler and half‐Heusler intermetallics. The basic crystal structures, the possibilities for doping and substitutions to adjust charge carrier concentration and thermal conductivity, baseline thermoelectric properties, and strategies for efficiency improvement are considered for each structure type. Examples of recent work highlighting these strategies are briefly presented.

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Influence of Compensating Defect Formation on the Doping Efficiency and Thermoelectric Properties of Cu_2-ySe_1–xBr_x

Cited by 68 publications

References 58 publications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

High Performance Thermoelectric Materials: Progress and Their Applications

Thermoelectric Materials

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Influence of Compensating Defect Formation on the Doping Efficiency and Thermoelectric Properties of Cu2-ySe1–xBrx

Cited by 68 publications

References 58 publications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

High Performance Thermoelectric Materials: Progress and Their Applications

Thermoelectric Materials

Contact Info

Product

Resources

About

Influence of Compensating Defect Formation on the Doping Efficiency and Thermoelectric Properties of Cu_2-ySe_1–xBr_x

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications