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나노입자 연구단
나노입자 연구단
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Ultrahigh Power Factor and Electron Mobility in n-Type Bi2Te3- x%Cu Stabilized under Excess Te Condition

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Title
Ultrahigh Power Factor and Electron Mobility in n-Type Bi2Te3- x%Cu Stabilized under Excess Te Condition
Author(s)
Joonil Cha; Chongjian Zhou; Cho S.-P.; Park S.H.; In Chung
Publication Date
2019-08
Journal
ACS APPLIED MATERIALS & INTERFACES, v.11, no.34, pp.30999 - 31008
Publisher
AMER CHEMICAL SOC
Abstract
© 2019 American Chemical Society.The thermoelectric (TE) community has mainly focused on improving the figure of merit (ZT) of materials. However, the output power of TE devices directly depends on the power factor (PF) rather than ZT. Effective strategies of enhancing PF have been elusive for Bi2Te3-based compounds, which are efficient thermoelectrics operating near ambient temperature. Here, we report ultrahigh carrier mobility of ∼467 cm2 V-1 s-1 and power factor of ∼45 μW cm-1 K-2 in a new n-type Bi2Te3 system with nominal composition CuxBi2Te3.17 (x = 0.02, 0.04, and 0.06). It is obtained by reacting Bi2Te3 with surplus Cu and Te and subsequently pressing powder products by spark plasma sintering (SPS). The SPS discharges excess Te but stabilizes the high extent of Cu in the structure, giving unique SPS CuxBi2Te3.17 samples. The analyzed composition is close to "CuxBi2Te3". Their charge transport properties are highly unusual. Hall carrier concentration and mobility simultaneously increase with the higher mole fraction of Cu contrary to the typical carrier scattering mechanism. As a consequence, the electrical conductivity is considerably enhanced with Cu incorporation. The Seebeck coefficient is nearly unchanged by the increasing Cu content in contrast to the general understanding of inverse relationship between electrical conductivity and Seebeck coefficient. These effects synergistically lead to a record high power factor among all polycrystalline n-type Bi2Te3-based materials
URI
https://pr.ibs.re.kr/handle/8788114/6901
ISSN
1944-8244
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
Files in This Item:
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