Effects of stoichiometry on structural, morphological and nanomechanical properties of bi2 se3 thin films deposited on inp(111) substrates by pulsed laser deposition

Yeong Maw Hwang, Cheng Tang Pan, Bo Syun Chen, Phuoc Huu Le*, Ngo Ngoc Uyen, Le Thi Cam Tuyen, Vanthan Nguyen, Chih-Wei Luo, Jenh-Yih Juang, Jih-Perng Leu, Sheng Rui Jian

*此作品的通信作者

研究成果: Article同行評審

摘要

In the present study, the structural, morphological, compositional, nanomechanical, and surface wetting properties of Bi2 Se3 thin films prepared using a stoichiometric Bi2 Se3 target and a Se-rich Bi2 Se5 target are investigated. The Bi2 Se3 films were grown on InP(111) substrates by using pulsed laser deposition. X-ray diffraction results revealed that all the as-grown thin films exhibited were highly c-axis-oriented Bi2 Se3 phase with slight shift in diffraction angles, presumably due to slight stoichiometry changes. The energy dispersive X-ray spectroscopy analyses indicated that the Se-rich target gives rise to a nearly stoichiometric Bi2 Se3 films, while the stoichiometric target only resulted in Se-deficient and Bi-rich films. Atomic force microscopy images showed that the films’ surfaces mainly consist of triangular pyramids with step-and-terrace structures with average roughness, Ra, being ~2.41 nm and ~1.65 nm for films grown with Bi2 Se3 and Bi2 Se5 targets, respectively. The hardness (Young’s modulus) of the Bi2 Se3 thin films grown from the Bi2 Se3 and Bi2 Se5 targets were 5.4 GPa (110.2 GPa) and 10.3 GPa (186.5 GPa), respectively. The contact angle measurements of water droplets gave the results that the contact angle (surface energy) of the Bi2 Se3 films obtained from the Bi2 Se3 and Bi2 Se5 targets were 80 (21.4 mJ/m2 ) and 110 (11.9 mJ/m2 ), respectively.

原文English
文章編號958
頁(從 - 到)1-12
頁數12
期刊Coatings
10
發行號10
DOIs
出版狀態Published - 十月 2020

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