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Theoretical Maximum Thermoelectric Performance of Cu-doped and Electric Current Pulse-treated Bi-Sb-Te Alloys
Cu 도핑 및 Electric Current Pulse 공정에 의한 Bi-Sb-Te계 열전소재의 최대 열전성능지수 예측
Joonha Lee, Hyunjin Park, Junsu Kim, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim
이준하, 박현진, 김준수, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2024;62(7):550-557.   Published online 2024 Jun 28
DOI: https://doi.org/10.3365/KJMM.2024.62.7.550

Abstract
Bi2Te3 shows high thermoelectric performance near room temperature, making it the most widely used material in thermoelectric cooling applications. Cu doping has been found to be effective in improving the thermoelectric performance of Bi2Te3. However, due to the problem of easy migration of Cu ions, the stability of Cu-doped Bi2Te3..... More

                
Estimation of Maximum zT in Cu3SbSe4 for Different Starting Materials Content
시작물질 농도 제어에 따른 Cu3SbSe4 열전소재의 최대 열전성능지수 예측
Minkyu Lee, Seong-Mee Hwang, Se Jun Kim, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim
이민규, 황성미, 김세준, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2024;62(6):487-493.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.487

Abstract
Cu3SbSe4 is considered a promising thermoelectric material because of its large effective mass and low thermal conductivity, originating from its unique lattice structure. However, Cu3SbSe4 has intrinsically low carrier concentration and relatively high electric resistance which limit performance. Recently, a zT improvement in Cu3SbSe4 was reported where doping/precipitation is controlled..... More

                
Characterization of Transparent Electrodes with Ag Metal-mesh using MATLAB
MATLAB을 이용한 Ag Metal-mesh 기반의 투명 전극 특성 분석
Seung-Taek Jo, Jin Wook Shin, Walter Commerell, Dae-Hwang Yoo, Hyesun Yoo, Jinyoung Hwang, Hyun-Sik Kim, Sang-il Kim, Jong Wook Roh
조승택, 신진욱, Walter Commerell, 유대황, 류혜선, 황진영, 김현식, 김상일, 노종욱
Korean J. Met. Mater. 2024;62(6):464-471.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.464

Abstract
It is well-known that optical transparence and electric resistance have a trade-off relationship in transparent electrodes. For this reason, developing methods to predict this relation have been important in various fields of academic research as well as for industrial applications. Herein, we suggest a simple method which reveals the relationship..... More

                
Thermomechanical Behavior and Microstructure Properties of Carbon Fiber Reinforced Polymer at Elevated Temperatures
Okmin Park, Seulgi Han, Sanghyun Park, Jamil Ur Rahman, Sang-il Kim, Sungmo Choi
Korean J. Met. Mater. 2024;62(1):57-64.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.57

Abstract
Carbon fiber reinforced polymer (CFRP) has been extensively used in civil engineering for applications such as reinforcing and retrofitting various architectural materials. Therefore, understanding the degradation of CFRP under high temperatures is important. This study aims to investigate the thermomechanical and microstructural properties of CFRP plates at elevated temperatures up..... More

                
Thermoelectric Transport Properties of Sb-doped SnSe2 Polycrystalline Alloys
Seung Min Kang, Jong Wook Rho, Hyungyu Cho, Sanghyun Park, Joontae Park, Sang-il Kim
Korean J. Met. Mater. 2023;61(11):842-848.   Published online 2023 Oct 29
DOI: https://doi.org/10.3365/KJMM.2023.61.11.842

Abstract
SnSe2 alloys have been investigated in recent times as potential n-type thermoelectric materials. In this study, the thermoelectric transport properties of a series of Sb-doped SnSe2, Sn(Se1-xSbx)2 (x = 0, 0.015, 0.03, 0.045, 0.06) alloys are investigated. The electrical conductivity was generally enhanced with Sb doping owing to a large..... More

                   Web of Science 1  Crossref 1
Influence of Elevated Temperature on the Mechanical and Microstructural Properties of Glass Fiber-Reinforced Polymers
Se Woong Lee, Seulgi Han, Okmin Park, Sang-il Kim, Sungmo Choi
Korean J. Met. Mater. 2023;61(10):800-806.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.800

Abstract
Glass fiber-reinforced polymers (GFRPs) have attracted significant attention as structural materials because of their high fatigue resistance, corrosion resistance, strength, and stiffness. This study examined the effect of elevated temperatures (150, 250, 350, and 450oC) on the microstructural and mechanical properties of GFRP plates. The number of bubbles increased as..... More

                   Web of Science 2  Crossref 2
Lattice Thermal Conductivities of Yb(Cd1-xMgx)2Sb2 Analyzed via Debye-Callaway Model
Debye-Callaway 모델 기반 Yb(Cd1-xMgx)2Sb2 열전 합금의 격자 열전도도 분석
Minsu Heo, Seung-Hwan Kwon, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim
허민수, 권승환, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2023;61(8):608-615.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.608

Abstract
YbCd2Sb2-based Zintl phases have been identified as promising materials for thermoelectric applications due to their high Seebeck coefficient and electrical conductivity. However, their high thermal conductivity limits their overall thermoelectric performance. To address this, Mg has recently been introduced as an alloying element at Cd atomic sites to reduce the..... More

                   Web of Science 1  Crossref 1
Enhanced Thermoelectric Transport Properties in Cu-added Bi2Se3 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 Bi2Te3-based thermoelectric alloys has been studied as an effective way to enhance thermoelectric transport properties. In this study, the influence of adding Cu to Bi2Se3 alloys, which have the same rhombohedral crystal structure as Bi2Te3, was investigated by synthesizing a series of CuxBi2Se3 (x..... More

                   Web of Science 1  Crossref 1
Electrical, Thermal, and Thermoelectric Transport Properties of Co-Doped n-type Cu0.008Bi2Te2.6Se0.4 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
Bi2Te3-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 Cu0.008Bi2Te2.6Se0.4 polycrystalline alloys (Cu0.008Bi2−xCoxTe2.6Se0.4, x = 0, 0.03, 0.06, 0.09 and 0.12) are investigated. The electrical conductivity of the Cu0.008Bi1.97Co0.03Te2.6Se0.4 (x =..... More

                   Web of Science 2  Crossref 2
The Mechanism behind the High Thermoelectric Performance in YbCd2-xMgxSb2
YbCd2-xMgxSb2 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 Kim
권승환, 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
YbCd2Sb2 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 YbCd2Sb2 to improve its thermoelectric performance. However, the..... More

                   Web of Science 1  Crossref 1
Optical and Optoelectronic Properties of Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 Flakes
Bi2Te3, Sb2Te3, 및 Bi0.5Sb1.5Te3 플레이크들의 광학 및 광전자적 특성
Hyeun Seung Jo, Ju Won Kim, Sang-iL Kim, TaeWan Kim
조현승, 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 Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes. The synthesized Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes..... More

                
Characterization of Electronic Transport Properties of Narrow-Band Gap Fe(Se1-xTex)2 Alloys via the Two-Band Model
Two-Band 모델을 이용한 작은 밴드 갭을 가진 Fe(Se1-xTex)2 열전합금의 전기적 수송 특성 분석
Seong-Mee Hwang, Sang-il Kim, Min-Su Heo, Kiyoung Lee, Heesun Yang, Won-Seon Seo, Hyun-Sik Kim
황성미, 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(Se1-xTex)2 Thermoelectric Alloys
Mo(Se1-xTex)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 Kim
이유종, 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 σS2T/(κe + κl), where the σ, S, T, κe, and κl are the electrical conductivity, Seebeck coefficient,..... More

                
Transition to n-type Thermoelectric Conduction in Ni-doped FeSe2 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 FeSe2 polycrystalline alloys. FeSe2 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, Fe1-xNixSe2 polycrystalline samples with x =..... More

                   Web of Science 4  Crossref 5
Electrical, Thermal, and Thermoelectric Transport Properties of Se-doped Polycrystalline Re2Te5
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
Re2Te5 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 Re2Te5 (Re2Te5-xSex, x = 0, 0.2, 1, and 2) samples were synthesized, and their electrical and thermal transport properties were investigated. Pure orthorhombic Re2Te5 phases..... More

                   Web of Science 3  Crossref 3
Thermoelectric Properties of Cu-added Polycrystalline Bi2O2Se 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
Bi2O2Se 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, Bi2O2Se 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

                   Web of Science 2  Crossref 2
Study of Phase Formation Behavior and Electronic Transport Properties in the FeSe2 -FeTe2 System
FeSe2-FeTe2 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 Kim
박옥민, 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 FeSe2-FeTe2 system and the evolution of their thermoelectric transport properties. A series of Fe(Se1-xTex)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 FeSe0.4Te1.6(x = 0.2)...... More

                   Web of Science 11  Crossref 9
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 Kim
김상일, 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

                   Web of Science 8  Crossref 8
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 Kim
김상일, 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

                   Web of Science 6  Crossref 6
Influence of Te Vacancies on the Thermoelectric Properties of n-type Cu0.008Bi2Te2.7-xSe0.3
n-type Cu0.008Bi2Te2.7-xSe0.3 열전 합금에서 Te 공공 형성에 의한 열전 성능 연구
Yerim Yang, TaeWan Kim, Seokown Hong, Jiwoo An, Sang-il Kim
양예림, 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 Cu0.008Bi2Te2.7Se0.3 alloys, including their electronic and thermal transport properties. Te-deficient Cu0.008Bi2Te2.7-xSe0.3 (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

                   Web of Science 5  Crossref 5
Influence of Cu Doping on Bipolar Conduction Suppression for p-type Bi0.5Sb1.5Te3 and Bi0.4Sb1.6Te3 Alloys
Cu 첨가에 따른 p-type Bi0.5Sb1.5Te3 및 Bi0.4Sb1.6Te3 합금의 양극성 전도 저감 효과
Hyun-Jun Cho, Hyun-Sik Kim, Woong-hee Sohn, Sang-il Kim
조현준, 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 Bi0.5Sb1.5Te3 and Bi0.4Sb1.6Te3 thermoelectric alloys, including their electronic and thermal transport properties. For electronic transport, the power factors of both Bi0.5Sb1.5Te3 and Bi0.4Sb1.6Te3 compositions were increased by Cu doping. The origins of the enhanced power..... More

                   Web of Science 6  Crossref 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, SnSe2, In2Se3, and In4Se3 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

                   Web of Science 7  Crossref 8
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 Kim
조현준, 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 Bi0.4Sb1.6Te3 alloy, different groups of samples were prepared and characterized, including undoped Bi0.4Sb1.6Te3, In single-doped samples and In..... More

                   Web of Science 9  Crossref 6
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