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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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Enhanced Thermoelectric Transport Properties in Cu-added Bi
2
Se
3
Polycrystalline Alloys
Hyungyu Cho, TaeWan Kim, Seung Min Kang, Sanghyun Park, Sang-il Kim
Korean J. Met. Mater.
2023;61(6):431-436. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.431
Abstract
The addition of Cu to layered Bi
2
Te
3
-based thermoelectric alloys has been studied as an effective way to enhance thermoelectric transport properties. In this study, the influence of adding Cu to Bi
2
Se
3
alloys, which have the same rhombohedral crystal structure as Bi
2
Te
3
, was investigated by synthesizing a series of Cu
x
Bi
2
Se
3
(
x
.....
More
Electrical, Thermal, and Thermoelectric Transport Properties of Co-Doped
n
-type Cu
0.008
Bi
2
Te
2.6
Se
0.4
Polycrystalline Alloys
Okmin Park, TaeWan Kim, Minsu Heo, Sang Jeong Park, Se Woong Lee, Hyun Kyu Cho, Sang-il Kim
Korean J. Met. Mater.
2023;61(3):206-212. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.206
Abstract
Bi
2
Te
3
-based alloys have been extensively studied as thermoelectric materials near room temperature. In this study, the electrical, thermal, and thermoelectric transport properties of a series of Co-doped
n
-type Cu
0.008
Bi
2
Te
2.6
Se
0.4
polycrystalline alloys (Cu
0.008
Bi
2−x
Co
x
Te
2.6
Se
0.4
,
x
= 0, 0.03, 0.06, 0.09 and 0.12) are investigated. The electrical conductivity of the Cu
0.008
Bi
1.97
Co
0.03
Te
2.6
Se
0.4
(
x
=.....
More
The Mechanism behind the High Thermoelectric Performance in YbCd
2-x
Mg
x
Sb
2
YbCd
2-x
Mg
x
Sb
2
열전 합금의 열전 성능 증대 메커니즘 분석
Seung-Hwan Kwon, Sang-il Kim, Minsu Heo, Won-Seon Seo, Jong Wook Roh, Heesun Yang, Hyun-Sik Kim권승환, 김상일, 허민수, 서원선, 노종욱, 양희선, 김현식
Korean J. Met. Mater.
2023;61(3):198-205. Published online 2023 Feb 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.3.198
Abstract
YbCd
2
Sb
2
is a promising Zintl compound for waste heat recovery applications due to its low thermal conductivity, originating from its complex crystal structure. Many strategies such as alloying or doping have been suggested to further reduce the thermal conductivity of YbCd
2
Sb
2
to improve its thermoelectric performance. However, the.....
More
Optical and Optoelectronic Properties of Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
Flakes
Bi
2
Te
3
, Sb
2
Te
3
, 및 Bi
0.5
Sb
1.5
Te
3
플레이크들의 광학 및 광전자적 특성
Hyeun Seung Jo, Ju Won Kim, Sang-iL Kim, TaeWan Kim조현승, 김주원, 김상일, 김태완
Korean J. Met. Mater.
2023;61(2):107-114. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.107
Abstract
In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes. The synthesized Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes.....
More
Characterization of Electronic Transport Properties of Narrow-Band Gap Fe(Se
1-x
Te
x
)
2
Alloys via the Two-Band Model
Two-Band 모델을 이용한 작은 밴드 갭을 가진 Fe(Se
1-x
Te
x
)
2
열전합금의 전기적 수송 특성 분석
Seong-Mee Hwang, Sang-il Kim, Min-Su Heo, Kiyoung Lee, Heesun Yang, Won-Seon Seo, Hyun-Sik Kim황성미, 김상일, 허민수, 이기영, 양희선, 서원선, 김현식
Korean J. Met. Mater.
2023;61(2):98-106. Published online 2023 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2023.61.2.98
Abstract
Environmentally sustainable thermoelectric technologies can be more broadly applied in industries once the performance of thermoelectric materials is improved. Several approaches have been proposed to improve the electronic transport properties of thermoelectric materials. The effects of each approach on the electronic properties can be evaluated by changes in the band.....
More
Approaches to Estimate the Magnitude of Phonon Scattering via Point Defects in Mo(Se
1-x
Te
x
)
2
Thermoelectric Alloys
Mo(Se
1-x
Te
x
)
2
열전합금의 점 결함에 의한 포논 산란 효과 분석
You-Jong Lee, Sang-il Kim, Seong-Mee Hwang, Jeong-Yeon Kim, Won-Seon Seo, Hyun-Sik Kim이유종, 김상일, 황성미, 김정연, 서원선, 김현식
Korean J. Met. Mater.
2023;61(1):38-45. Published online 2022 Dec 28
DOI:
https://doi.org/10.3365/KJMM.2023.61.1.38
Abstract
One of the most popular routes used to improve the thermoelectric performance of materials is to suppress their lattice thermal conductivities. Thermoelectric performance is characterized by a figure-of-merit
zT
, which is defined as
σS
2
T
/(
κ
e
+
κ
l
), where the
σ
,
S
,
T
,
κ
e
, and
κ
l
are the electrical conductivity, Seebeck coefficient,.....
More
Transition to n-type Thermoelectric Conduction in Ni-doped FeSe
2
Alloys
Young Bin An, Sang Jeong Park, Okmin Park, Sang-il Kim
Korean J. Met. Mater.
2022;60(12):926-932. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.926
Abstract
We investigated the effect of Ni doping on the electrical, thermal, and thermoelectric transport properties of FeSe
2
polycrystalline alloys. FeSe
2
alloys exhibit both n-type and p-type conduction at different temperatures and thus their practicality as a thermoelectric material is somewhat limited. In this study, Fe
1-x
Ni
x
Se
2
polycrystalline samples with
x
=.....
More
Cited By 1
Electrical, Thermal, and Thermoelectric Transport Properties of Se-doped Polycrystalline Re
2
Te
5
Se Woong Lee, Okmin Park, Hyun-Sik Kim, Won-Seon Seo, Sang-il Kim
Korean J. Met. Mater.
2022;60(12):919-925. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.919
Abstract
Re
2
Te
5
is considered a potential thermoelectric material because of its intrinsically low thermal conductivity, due to its complex crystal structure. Herein, a series of Se-doped Re
2
Te
5
(Re
2
Te
5-x
Se
x
,
x
= 0, 0.2, 1, and 2) samples were synthesized, and their electrical and thermal transport properties were investigated. Pure orthorhombic Re
2
Te
5
phases.....
More
Cited By 2
Thermoelectric Properties of Cu-added Polycrystalline Bi
2
O
2
Se Oxyselenide
Si-young Bae, Se Woong Lee, Hyun-Sik Kim, Okmin Park, Hyunjin Park, Won-Seon Seo, Sang-il Kim
Korean J. Met. Mater.
2022;60(12):912-918. Published online 2022 Nov 25
DOI:
https://doi.org/10.3365/KJMM.2022.60.12.912
Abstract
Bi
2
O
2
Se oxyselenide has been actively studied as a potential
n
-type thermoelectric material because of its intrinsically low thermal conductivity and high Seebeck coefficient (S). However, Bi
2
O
2
Se has very low electrical conductivity (σ), resulting in relatively poor thermoelectric performance. Herein, we investigate the effect of Cu addition on the electrical and.....
More
Cited By 1
Study of Phase Formation Behavior and Electronic Transport Properties in the FeSe
2
-FeTe
2
System
FeSe
2
-FeTe
2
계 다결정 소재의 상 형성 거동 및 전기 전도 특성에 관한 연구
Okmin Park, TaeWan Kim, Se Woong Lee, Hyun-Sik Kim, Weon Ho Shin, Jamil Ur Rahman, Sang-il Kim박옥민, 김태완, 이세웅, 김현식, 신원호, , 김상일
Korean J. Met. Mater.
2022;60(4):315-320. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.315
Abstract
In this study, we investigated the phase formation behavior of the FeSe
2
-FeTe
2
system and the evolution of their thermoelectric transport properties. A series of Fe(Se
1-x
Te
x
)
2
(
x
= 0, 0.2, 0.6, 0.8 and 1) compounds were synthesized by conventional solid-state reaction. Single phase orthorhombic structures were formed, except for FeSe
0.4
Te
1.6
(
x
= 0.2)......
More
Cited By 5
Calculated Electric Transport Properties of Thermoelectric Semiconductors Under Different Carrier Scattering Mechanisms
캐리어 산란 메커니즘에 따른 열전반도체의 이론 전자수송 특성 변화
Sang-il Kim, Hyun-Sik Kim김상일, 김현식
Korean J. Met. Mater.
;59(2):127-134. Published online 2021 Jan 27
DOI:
https://doi.org/10.3365/KJMM.2021.59.2.127
Abstract
The widespread application of thermoelectric devices in cooling and waste heat recovery systems will be achieved when materials achieve high thermoelectric performance. However, improving thermoelectric performance is not straightforward because the Seebeck coefficient and electrical conductivity of the materials have opposite trends with varying carrier concentration. Here, we demonstrate that.....
More
Cited By 4
Impact of Fermi Surface Shape Engineering on Calculated Electronic Transport Properties of Bi-Sb-Te
페르미 면 형상제어에 따른 Bi-Sb-Te 이론 전자수송 특성 변화
Sang-il Kim, Jong-Chan Lim, Heesun Yang, Hyun-Sik Kim김상일, 임종찬, 양희선, 김현식
Korean J. Met. Mater.
2021;59(1):54-60. Published online 2021 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.1.54
Abstract
Using thermoelectric refrigerators can address climate change because they do not utilize harmful greenhouse gases as refrigerants. To compete with current vapor compression cycle refrigerators, the thermoelectric performance of materials needs to be improved. However, improving thermoelectric performance is challenging because of the trade-off relationship between the Seebeck coefficient and.....
More
Cited By 3
Influence of Te Vacancies on the Thermoelectric Properties of
n
-type Cu
0.008
Bi
2
Te
2.7-x
Se
0.3
n
-type Cu
0.008
Bi
2
Te
2.7-x
Se
0.3
열전 합금에서 Te 공공 형성에 의한 열전 성능 연구
Yerim Yang, TaeWan Kim, Seokown Hong, Jiwoo An, Sang-il Kim양예림, 김태완, 홍석원, 안지우, 김상일
Korean J. Met. Mater.
2020;58(10):721-727. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.721
Abstract
In this study, we report the influence of Te vacancy formation on the thermoelectric properties of
n
-type Cu
0.008
Bi
2
Te
2.7
Se
0.3
alloys, including their electronic and thermal transport properties. Te-deficient Cu
0.008
Bi
2
Te
2.7-x
Se
0.3
(
x
= 0, 0.005, 0.01 and 0.02) samples were systematically synthesized and characterized. Regarding electronic transport properties, carrier concentration was increased with.....
More
Cited By 2
Influence of Cu Doping on Bipolar Conduction Suppression for
p
-type Bi
0.5
Sb
1.5
Te
3
and Bi
0.4
Sb
1.6
Te
3
Alloys
Cu 첨가에 따른 p-type Bi
0.5
Sb
1.5
Te
3
및 Bi
0.4
Sb
1.6
Te
3
합금의 양극성 전도 저감 효과
Hyun-Jun Cho, Hyun-Sik Kim, Woong-hee Sohn, Sang-il Kim조현준, 김현식, 손웅희, 김상일
Korean J. Met. Mater.
2020;58(6):439-445. Published online 2020 May 21
DOI:
https://doi.org/10.3365/KJMM.2020.58.6.439
Abstract
In this study, we report how Cu doping can modify the thermoelectric performance of
p
-type Bi
0.5
Sb
1.5
Te3 and Bi
0.4
Sb
1.6
Te3 thermoelectric alloys, including their electronic and thermal transport properties. For electronic transport, the power factors of both Bi
0.5
Sb
1.5
Te3 and Bi0.4Sb1.6Te3 compositions were increased by Cu doping. The origins of the enhanced power.....
More
Cited By 2
Enhanced Thermoelectric Transport Properties of
n
-type InSe by Sn doping
Sung-sil Choo, Seok-won Hong, Hyun-Sik Kim, Sang-il Kim
Korean J. Met. Mater.
2020;58(5):348-352. Published online 2020 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2020.58.5.348
Abstract
Layered post transition metal chalcogenides such as SnSe, SnSe
2
, In
2
Se
3
, and In
4
Se
3
have attracted attention as promising thermoelectric materials due to their intrinsically low lattice thermal conductivities. Recently,
n
-type indium selenide (InSe) based materials have also been suggested as good candidates for thermoelectric materials by optimizing their electrical properties, i.e.,.....
More
Cited By 5
Effect of Cu/In Doping on the Thermoelectric Transport Properties of Bi-Sb-Te Alloys
Bi-Sb-Te계 합금의 열전물성에 대한 Cu 및 In 첨가 영향
Hyun Jun Cho, Hyun-Sik Kim, Sang-Il Kim조현준, 김현식, 김상일
Korean J. Met. Mater.
2019;57(10):673-678. Published online 2019 Sep 23
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.673
Abstract
Herein we report the effect of Cu/In doping on the electronic and thermal transport properties of Bi-Sb-Te thermoelectric alloys. To closely examine the role of each doping element when incorporated in a Bi
0.4
Sb
1.6
Te
3
alloy, different groups of samples were prepared and characterized, including undoped Bi
0.4
Sb
1.6
Te
3
, In single-doped samples and In.....
More
Cited By 6
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