In situ crystal-amorphous compositing inducing ultrahigh thermoelectric performance of p-type Bi0.5Sb1.5Te3 hybrid thin films

Tan, Ming and Liu, Wei-Di and Shi, Xiao-Lei ORCID: https://orcid.org/0000-0003-0905-2547 and Shang, Jin and Li, Hui and Liu, Xiaobao and Kou, Liangzhi and Dargusch, Matthew and Deng, Yuan and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2020) In situ crystal-amorphous compositing inducing ultrahigh thermoelectric performance of p-type Bi0.5Sb1.5Te3 hybrid thin films. Nano Energy, 78:105379. ISSN 2211-2855


Abstract

Flexible Bi0.5Sb1.5Te3-based thermoelectric thin films are promising p-type candidates for applications in flexible and wearable electronics. Here, we use thermal evaporation deposition and subsequent post-annealing treatment to prepare Bi0.5Sb1.5Te3 crystal-amorphous hybrid thin films. Tuning the annealing temperature can achieve an optimized hybrid level between amorphous and crystalline Bi0.5Sb1.5Te3, leading to an optimized figure of merit as high as ∼1.5 at room temperature, which is an ultrahigh value in the p-type Bi0.5Sb1.5Te3 thin films. Our single parabolic band model and Density-Functional Theory calculation results indicate that such a high value should be attributed to the high effective mass induced by the proper crystal-amorphous hybrid structure. Our study indicates that a crystal-amorphous compositing can be used as a new methodology to achieve ultrahigh performance in thermoelectric materials.


Statistics for USQ ePrint 39634
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 02 Oct 2020 04:29
Last Modified: 23 Oct 2020 03:58
Uncontrolled Keywords: thermoelectric performance, film, Bi0.5Sb1.5Te3, amorphous, crystallinity
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials
Identification Number or DOI: https://doi.org/10.1016/j.nanoen.2020.105379
URI: http://eprints.usq.edu.au/id/eprint/39634

Actions (login required)

View Item Archive Repository Staff Only