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ENHANCEMENT OF POLYMER COATING ON BIODEGRADABLE METAL BY FEMTOSECOND LASER SURFACE MODIFICAITON
Jaeho Park(박재호),Yongwoo Chung(정용우),Hyung-Seop Han(한형섭),Sunhee Lee(이선희),Jimin Park(박지민),Yu-Chan Kim(김유찬),Myoungryul OK(옥명렬),Hyun-Kwang Seok(석현광),Seok Chung(정석),Jeewook Lee(이지욱),Hojeong Jeon(전호정) 한국표면공학회 2016 한국표면공학회 학술발표회 초록집 Vol.2016 No.5
Phase-dependent thermal conductivity of electrodeposited antimony telluride films
Yu, Ziqi,Ferrer-Argemi, Laia,Kim, Jiwon,Lim, Jae-Hong,Myung, Nosang V.,Lee, Jaeho The Royal Society of Chemistry 2018 Journal of materials chemistry. C, Materials for o Vol.6 No.13
<P>Electrodeposition is a unique technique that can readily control the phase and the degree of crystallinity of the deposit, and this capability provides special opportunities to investigate phase-dependent thermoelectric properties from amorphous to crystalline by annealing. While the electrical conductivity and the Seebeck coefficient of electrodeposited antimony telluride films have demonstrated unique annealing temperature dependencies, their thermal conductivity remains unknown. Here, we report the thermal conductivity of electrodeposited Sb37Te63 films and present its dependence on pre-annealing temperature, annealing time, and measurement temperature. By controlling the pre-annealing temperature from 50 °C to 200 °C, the thermal conductivity of Sb37Te63 films increases from 0.36 ± 0.07 W m<SUP>−1</SUP> K<SUP>−1</SUP> to 1.73 ± 0.18 W m<SUP>−1</SUP> K<SUP>−1</SUP> at room temperature, indicating the amorphous to crystalline phase transition, as supported by our X-ray diffraction patterns. By controlling the annealing time up to 5 hours at constant temperatures of 100 °C and 200 °C, the transient thermal conductivity measurements reveal the crystallization activation energies of 1.12 eV and 1.36 eV, respectively. By controlling the thermal conductivity measurement temperature from −73 °C to 187 °C, we identify dominant thermal transport mechanisms in each phase, in accordance with classical phonon models. The relationship between thermal conductivity and temperature shifts from a positive to a negative correlation in crystalline Sb37Te63 films, and we infer that Umklapp scattering dominates over other scattering mechanisms and effects of phase impurities, surface boundaries, and grain structures in thermal transport. These findings can guide optimal design and processing of chalcogenide thermoelectric materials.</P>