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Materials 2018, 11(7), 1194; https://doi.org/10.3390/ma11071194

Electrodeposition of p-Type Sb2Te3 Films and Micro-Pillar Arrays in a Multi-Channel Glass Template

1
,
1
,
2,* , 3
and
1,*
1
Graduate School of Shenzhen, Tsinghua University, Shenzhen 518065, China
2
Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Energy, Shenzhen University, Shenzhen 518060, China
3
Huaneng Clean Energy Research Institute, Beijing 102209, China
*
Authors to whom correspondence should be addressed.
Received: 5 June 2018 / Revised: 5 July 2018 / Accepted: 9 July 2018 / Published: 12 July 2018
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Abstract

Antimony telluride (Sb2Te3)-based two-dimensional films and micro-pillar arrays are fabricated by electrochemical deposition from electrolytes containing SbO+ and HTeO2+ on Si wafer-based Pt electrode and multi-channel glass templates, respectively. The results indicate that the addition of tartaric acid increases the solubility of SbO+ in acidic solution. The compositions of deposits depend on the electrolyte concentration, and the micro morphologies rely on the reduction potential. Regarding the electrolyte containing 8 mM of SbO+ and 12 mM of HTeO2+, the grain size increases and the density of films decreases as the deposition potential shifts from −100 mV to −400 mV. Sb2Te3 film with nominal composition and dense morphology can be obtained by using a deposition potential of −300 mV. However, this condition is not suitable for the deposition of Sb2Te3 micro-pillar arrays on the multi-channel glass templates because of its drastic concentration polarization. Nevertheless, it is found that the pulsed voltage deposition is an effective way to solve this problem. A deposition potential of −280 mV and a dissolve potential of 500 mV were selected, and the deposition of micro-pillars in a large aspect ratio and at high density can be realized. The deposition technology can be further applied in the fabrication of micro-TEGs with large output voltage and power. View Full-Text
Keywords: thermoelectric device; electrodeposition; Sb2Te3 micro-pillar arrays; multi-channel glass template thermoelectric device; electrodeposition; Sb2Te3 micro-pillar arrays; multi-channel glass template
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Su, N.; Guo, S.; Li, F.; Liu, D.; Li, B. Electrodeposition of p-Type Sb2Te3 Films and Micro-Pillar Arrays in a Multi-Channel Glass Template. Materials 2018, 11, 1194.

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