Potential-current co-adjusted pulse electrodeposition for highly (110)-oriented Bi2Te3-xSex films

Jiwon Kim; Kyu Hyoung Lee; Sung Wng Kim; Jae Hong Lim

doi:10.1016/j.jallcom.2019.01.301

Potential-current co-adjusted pulse electrodeposition for highly (110)-oriented Bi₂Te_3-xSe_x films

Jiwon Kim, Kyu Hyoung Lee, Sung Wng Kim, Jae Hong Lim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Controllable crystal orientation is necessary to obtain high thermoelectric performance in thin films of Bi₂Te₃ alloys. In the present study, highly (110)-oriented thin films of n-type Bi₂Te_3-xSe_x with improved composition controllability are prepared through a simple electrodeposition-based process. Using potential-current co-adjusted pulse electrodeposition (PCP-ED) with adjustments to the zero current during the off-time period enables the fabrication of dense Bi₂Te_3-xSe_x thin films with highly (110)-oriented grains by minimizing the ionic gradient (Bi³⁺, Te²⁻, Se²⁻) between the substrate and solution. The power factor of the PCP-ED thin film was much higher than that of the dendritic Bi₂Te_3-xSe_x thin film fabricated by constant-potentiostatic electrodeposition (C-ED) because of the simultaneous enhancement of electrical conductivity and Seebeck coefficient. The high power factor of ∼1920 μW/m⋅K², which is the best value among reported n-type Bi₂Te₃-based thin films, was obtained at room temperature after low-temperature annealing at 200 °C by exploiting the crystallinity enhancement and carrier concentration optimization.

Original language	English
Pages (from-to)	767-771
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	787
DOIs	https://doi.org/10.1016/j.jallcom.2019.01.301
Publication status	Published - 2019 May 30

Bibliographical note

Funding Information:
This work was supported by the Global Frontier Program through the Global Frontier Hybrid Interface Materials ( GFHIM ) project (grant number 2013M3A6B1078870 ) of the National Research Foundation of Korea ( NRF ), which is funded by the Ministry of Science, ICT, & Future Planning , and by the New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) (grant number 20153030013200 ). The Korea Research Fellowship (KRF) (grant number 2015H1D3A1066157 ) also supported this work. Appendix A

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2019.01.301

Fingerprint Dive into the research topics of 'Potential-current co-adjusted pulse electrodeposition for highly (110)-oriented Bi2Te3-xSex films'. Together they form a unique fingerprint.

Cite this

@article{ba8a569cad5f497da9dc24bdcd2bada8,

title = "Potential-current co-adjusted pulse electrodeposition for highly (110)-oriented Bi2Te3-xSex films",

abstract = "Controllable crystal orientation is necessary to obtain high thermoelectric performance in thin films of Bi2Te3 alloys. In the present study, highly (110)-oriented thin films of n-type Bi2Te3-xSex with improved composition controllability are prepared through a simple electrodeposition-based process. Using potential-current co-adjusted pulse electrodeposition (PCP-ED) with adjustments to the zero current during the off-time period enables the fabrication of dense Bi2Te3-xSex thin films with highly (110)-oriented grains by minimizing the ionic gradient (Bi3+, Te2−, Se2−) between the substrate and solution. The power factor of the PCP-ED thin film was much higher than that of the dendritic Bi2Te3-xSex thin film fabricated by constant-potentiostatic electrodeposition (C-ED) because of the simultaneous enhancement of electrical conductivity and Seebeck coefficient. The high power factor of ∼1920 μW/m⋅K2, which is the best value among reported n-type Bi2Te3-based thin films, was obtained at room temperature after low-temperature annealing at 200 °C by exploiting the crystallinity enhancement and carrier concentration optimization.",

author = "Jiwon Kim and Lee, {Kyu Hyoung} and Kim, {Sung Wng} and Lim, {Jae Hong}",

note = "Funding Information: This work was supported by the Global Frontier Program through the Global Frontier Hybrid Interface Materials ( GFHIM ) project (grant number 2013M3A6B1078870 ) of the National Research Foundation of Korea ( NRF ), which is funded by the Ministry of Science, ICT, & Future Planning , and by the New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) (grant number 20153030013200 ). The Korea Research Fellowship (KRF) (grant number 2015H1D3A1066157 ) also supported this work. Appendix A ",

year = "2019",

month = may,

day = "30",

doi = "10.1016/j.jallcom.2019.01.301",

language = "English",

volume = "787",

pages = "767--771",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Potential-current co-adjusted pulse electrodeposition for highly (110)-oriented Bi2Te3-xSex films

AU - Kim, Jiwon

AU - Lee, Kyu Hyoung

AU - Kim, Sung Wng

AU - Lim, Jae Hong

N1 - Funding Information: This work was supported by the Global Frontier Program through the Global Frontier Hybrid Interface Materials ( GFHIM ) project (grant number 2013M3A6B1078870 ) of the National Research Foundation of Korea ( NRF ), which is funded by the Ministry of Science, ICT, & Future Planning , and by the New & Renewable Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ) (grant number 20153030013200 ). The Korea Research Fellowship (KRF) (grant number 2015H1D3A1066157 ) also supported this work. Appendix A

PY - 2019/5/30

Y1 - 2019/5/30

N2 - Controllable crystal orientation is necessary to obtain high thermoelectric performance in thin films of Bi2Te3 alloys. In the present study, highly (110)-oriented thin films of n-type Bi2Te3-xSex with improved composition controllability are prepared through a simple electrodeposition-based process. Using potential-current co-adjusted pulse electrodeposition (PCP-ED) with adjustments to the zero current during the off-time period enables the fabrication of dense Bi2Te3-xSex thin films with highly (110)-oriented grains by minimizing the ionic gradient (Bi3+, Te2−, Se2−) between the substrate and solution. The power factor of the PCP-ED thin film was much higher than that of the dendritic Bi2Te3-xSex thin film fabricated by constant-potentiostatic electrodeposition (C-ED) because of the simultaneous enhancement of electrical conductivity and Seebeck coefficient. The high power factor of ∼1920 μW/m⋅K2, which is the best value among reported n-type Bi2Te3-based thin films, was obtained at room temperature after low-temperature annealing at 200 °C by exploiting the crystallinity enhancement and carrier concentration optimization.

AB - Controllable crystal orientation is necessary to obtain high thermoelectric performance in thin films of Bi2Te3 alloys. In the present study, highly (110)-oriented thin films of n-type Bi2Te3-xSex with improved composition controllability are prepared through a simple electrodeposition-based process. Using potential-current co-adjusted pulse electrodeposition (PCP-ED) with adjustments to the zero current during the off-time period enables the fabrication of dense Bi2Te3-xSex thin films with highly (110)-oriented grains by minimizing the ionic gradient (Bi3+, Te2−, Se2−) between the substrate and solution. The power factor of the PCP-ED thin film was much higher than that of the dendritic Bi2Te3-xSex thin film fabricated by constant-potentiostatic electrodeposition (C-ED) because of the simultaneous enhancement of electrical conductivity and Seebeck coefficient. The high power factor of ∼1920 μW/m⋅K2, which is the best value among reported n-type Bi2Te3-based thin films, was obtained at room temperature after low-temperature annealing at 200 °C by exploiting the crystallinity enhancement and carrier concentration optimization.

UR - http://www.scopus.com/inward/record.url?scp=85061638278&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85061638278&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.01.301

DO - 10.1016/j.jallcom.2019.01.301

M3 - Article

AN - SCOPUS:85061638278

VL - 787

SP - 767

EP - 771

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -