Doping amount dependence of phase formation and microstructure evolution in heavily Cu-doped Bi2Te3 films for thermoelectric applications

Kang Hyun Seo, Byeong Geun Kim, Chang Hyun Lim, Sang Ho Kim, Kyu Mann Lee, Jong Young Kim, Soon Mok Choi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Heavily Cu-doped Bi2Te3 films with different Cu contents (∼47.9 at%) were prepared by co-sputtering with Cu and Bi2Te3 targets at room temperature and post-annealing at ∼500 °C. When the Cu content increased, the lattice parameters of the c-axis gradually increased with the increase of Cu intercalation into van der Waals gaps between the quintets of the Bi2Te3 layers. When a Cu content of above 43.7 at% was added, formation of a Cu2Te phase was detected along with the phase transition from Bi2Te3 to Te-deficient BixTey in the films annealed at 300 °C. The porous column structure of the pure Bi2Te3 film became gradually dense with the increase of Cu content. When the Cu content was increased, the thermoelectric power factors of heavily Cu-doped Bi2Te3 films were enhanced by the increase of carrier concentration.

Original languageEnglish
Pages (from-to)2750-2757
Number of pages8
JournalCrystEngComm
Volume19
Issue number20
DOIs
StatePublished - 2017
Externally publishedYes

Funding

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2014R1A1A2057767). This paper was also supported by the Post-doc. Scholarship program of KOREATECH.

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