首页|Realizing High Thermoelectric Performance in n-Type Se-Free Bi2Te3 Materials by Spontaneous Incorporation of FeTe2 Nanoinclusions

Realizing High Thermoelectric Performance in n-Type Se-Free Bi2Te3 Materials by Spontaneous Incorporation of FeTe2 Nanoinclusions

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Bi2Te3-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room temperature.However,the stability of existing n-type Bi2(Te,Se)3 materials is still low due to the evaporation energy of Se(37.70 kJ mol-1)being much lower than that of Te(52.55 kJ mol-1).The evaporated Se from the material causes problems in interconnects of the module while degrading the efficiency.Here,we have developed a new approach for the high-performance and stable n-type Se-free Bi2Te3-based materials by maximizing the electronic transport while suppressing the phonon transport,at the same time.Spontaneously generated FeTe2 nanoinclusions within the matrix during the melt-spinning and subsequent spark plasma sintering is the key to simultaneous engineering of the power factor and lattice thermal conductivity.The nanoinclusions change the fermi level of the matrix while intensifying the phonon scattering via nanoparticles.With a fine-tuning of the fermi level with Cu doping in the n-type Bi2Te3-0.02FeTe2,a high power factor of～41 × 10-4Wm-1 K-2 with an average zT of 1.01 at the temperature range 300-470 K are achieved,which are comparable to those obtained in n-type Bi2(Te,Se)3 materials.The proposed approach enables the fabrication of high-performance n-type Bi2Te3-based materials without having to include volatile Se element,which guarantees the stability of the material.Consequently,widespread application of thermoelectric devices utilizing the n-type Bi2Te3-based materials will become possible.

Bi2Te3energy harvestingFeTe2nanoinclusionn-type materialsthermoelectric

Jamil Ur Rahman、Woo Hyun Nam、Yong-Jae Jung、Jong Ho Won、Jong-Min Oh、Nguyen Van Du、Gul Rahman、Víctor M.García-Suárez、Ran He、Kornelius Nielsch、Jung Young Cho、Won-Seon Seo、Jong Wook Roh、Sang-il Kim、Soonil Lee、Kyu Hyoung Lee、Hyun Sik Kim、Weon Ho Shin

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Leibniz Institute for Solid State and Materials Research,Dresden 01069,Germany

Advanced Materials Convergence R&D Division,Korea Institute of Ceramic Engineering & Technology,Jinju 52861,South Korea

Department of Electronic Materials Engineering,Kwangwoon University,Seoul 01897,South Korea

Department of Energy Engineering Dankook University,Cheonan 31116,South Korea

Faculty of Fundamental Science,Phenikaa University,Hanoi 10000,Vietnam

Department of Physics,Quaid-i-Azam University,Islamabad 45320,Pakistan

Departamento de Física,Universidad de Oviedo,Oviedo 33007,Spain

Nanomaterials and Nanotechnology Research Center-CINN,El Entrego 33940,Spain

Department of Materials Science and Engineering,Yonsei University,Seoul 03722,South Korea

School of Nano & Materials Science and Engineering,Kyungpook National University,Sangju 37224,South Korea

Department of Materials Science and Engineering,University of Seoul,Seoul 02504,South Korea

School of Materials Science and Engineering,Changwon National University,Changwon 51140,South Korea

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Nano-Material Technology Development Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Sci

2022M3H4A1A04076667

2024

10.1002/eem2.12663

能源与环境材料(英文)

能源与环境材料(英文)

ISSN：
年,卷(期)：2024.7(4)