Effects of Substrate Temperature on Nanomechanical Properties of Pulsed Laser Deposited Bi2Te3 Films
Source abstract
Abstract
The correlations among microstructure, surface morphology, hardness, and elastic modulus of Bi2Te3 thin films deposited on c-plane sapphire substrates by pulsed laser deposition are investigated. X-ray diffraction (XRD) and transmission electron microscopy are used to characterize the microstructures of the Bi2Te3 thin films. The XRD analyses revealed that the Bi2Te3 thin films were highly (00l)-oriented and exhibited progressively improved crystallinity when the substrate temperature (TS) increased. The hardness and elastic modulus of the Bi2Te3 thin films determined by nanoindentation operated with the continuous contact stiffness measurement (CSM) mode are both substantially larger than those reported for bulk samples, albeit both decrease monotonically with increasing crystallite size and follow the Hall—Petch relation closely. Moreover, the Berkovich nanoindentation-induced crack exhibited trans-granular cracking behaviors for all films investigated. The fracture toughness was significantly higher for films deposited at the lower TS; meanwhile, the fracture energy was almost the same when the crystallite size was suppressed, which indicated a prominent role of grain boundary in governing the deformation characteristics of the present Bi2Te3 films.
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Research context
OpenAlex topics: Metal and Thin Film Mechanics · High-pressure geophysics and materials · Adhesion, Friction, and Surface Interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Science and Engineering, I-Shou University, Kaohsiung 84001, Taiwan
Department of Physics and Biophysics, Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, Can Tho City 94000, Vietnam
Department of Chemical Engineering, College of Engineering Technology, Can Tho University, 3/2 Street, Can Tho City 900000, Vietnam
Department of Fragrance and Cosmetic Science, College of Pharmacy, Kaohsiung Medical University, 100 Shi-Chuan 1st Road, Kaohsiung 80708, Taiwan
Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung 84001, Taiwan
College of Engineering, National Taiwan University of Science and Technology, Taipei 106335, Taiwan
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Funding
the Ministry of Science and Technology, Taiwan · ietnam National Foundation for Science and Technology Development (NAFOSTED)
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