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نویسندگان مقالات پربازدید :
مجله مواد الکترونیکی 2013
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • sequential evaporation of bi-te thin films with controllable composition and their thermoelectric transport properties

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 853
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     we report a simplified sequential evaporation route that can deposit compositionally controllable bi-te thermoelectric (te) thin films without the need for a highly controlled facility. te and bi granules were used as starting materials, with their ratio being adjusted to obtain bi-te films with different compositions and thicknesses. the as-evaporated and annealed films were subjected to structural and morphological analysis, and their transport properties were measured. x-ray diffraction data revealed multiple phases for most films. energy-dispersive x-ray spectroscopy showed that the film composition was te-enriched due to the large vapor pressure difference of te and bi. a bi2te3single phase was obtained in the annealed films, having nominal composition of bite1.2. the existence of impurity phases, such as bi4te3 or elemental te, was found in all the as-evaporated films and in the annealed films with other nominal te/bi ratios, which degraded the te properties of the films by increasing their electrical conductivity and reducing their seebeck coefficient. a pure bi2te3 film with nominal te/bi ratio of 1.2 exhibited a maximum power factor of 7.9 × 10−4 w m−1 k2after annealing at 200°c. this work demonstrated a simple, undemanding, reliable method to deposit bi-te-based te thin films that can be utilized to fabricate low-cost te microgenerators.

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