教師資料查詢 | 類別: 期刊論文 | 教師: 張經霖 CHANG, HENRY CHING-LIN (瀏覽個人網頁)

標題:Low thermal conductivity and enhanced thermoelectric performance of nanostructured Al-doped ZnTe
學年104
學期1
出版(發表)日期2016/01/01
作品名稱Low thermal conductivity and enhanced thermoelectric performance of nanostructured Al-doped ZnTe
作品名稱(其他語言)
著者Ankam Bhaskar; Yi-Hsuan Pai; Wei-Ming Wu; Ching-Lin Chang; Chia-Jyi Liu
單位
出版者
著錄名稱、卷期、頁數Ceramics International 42(1B), p.1070–1076
摘要Nanostructured Zn1−xAlxTe (0≤x≤0.15) samples have been fabricated using hydrothermal synthesis and evacuating-and-encapsulating sintering. Thermoelectric properties are measured at 300–600 K. The thermopower of all the samples is positive, indicating that the predominant carriers are holes over the entire temperature range. The hole concentration increases with increasing Al3+ content. Based on the charge neutrality, the hole concentration is expected to decrease upon Al doping. However, the x-ray absorption spectroscopy indicates the electrons transfer from Zn 4s to Te 5d states upon Al doping, which might explain that the increase of hole concentration upon partial Al3+ substitution of Zn2+. Using Slack's model for estimating the lattice thermal conductivity, the Grüneisen parameter at 300 K is found to increase with Al doping content. The highest power factor (1.52 µW m−1 K−2) and highest dimensionless figure of merit (0.075) are attained at 575 K for Zn0.85Al0.15Te, representing an improvement of about 508% and 851% with respect to the nondoped ZnTe at the same temperature. These results suggest that aluminum is an effective doping element for improving the thermoelectric properties of ZnTe.
關鍵字A. Sintering;B. Electron microscopy;C. Electrical conductivity;C. Thermal conductivity;C. Thermal properties
語言英文
ISSN0272-8842;1873-3956
期刊性質國外
收錄於SCI;
產學合作
通訊作者Chia-Jyi Liu
審稿制度
國別英國
公開徵稿
出版型式,電子版,紙本
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