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http://hdl.handle.net/10397/92515
Title: | Strain-induced band gap tuning in flexible ferroelectric/mica thin films | Authors: | Sun, Y Wong, KH Kwok, KW |
Issue Date: | 1-Aug-2021 | Source: | Thin solid films, 1 Aug. 2021, v. 731, 138741 | Abstract: | Precise control of the band gap is crucial for lead-free ferroelectrics in the application of high-performance optical devices. In this work, we demonstrate that continuous and reversible tuning of optical band gap can be realized through mechanical strain in flexible Ba0.9Ca0.1Ti0.975Fe0.025O3 (BCTF)/mica films. Through bending the flexible films, a large mechanical strain of 0.85% could be introduced into the ferroelectric active layer, leading to a reduction in the band gap of 0.38 eV. The strong dependence of the optical band gap on mechanical bending mainly arisen from the strain-induced modification of Fe-O bond. Because of the superior mechanical property of mica, the flexible BCTF/mica film also exhibits excellent anti-fatigue characteristics over 103 bending cycles. Thus, this work provides an alternate perspective for the design and fabrication of ferroelectric optical devices that cover the entire visible light region. | Keywords: | Ferroelectric Thin film Strain Band gap |
Publisher: | Elsevier | Journal: | Thin solid films | ISSN: | 0040-6090 | EISSN: | 1879-2731 | DOI: | 10.1016/j.tsf.2021.138741 | Rights: | © 2021 Elsevier B.V. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Sun, Y., Wong, K. H., & Kwok, K. W. (2021). Strain-induced band gap tuning in flexible ferroelectric/mica thin films. Thin Solid Films, 731, 138741 is available at https://doi.org/10.1016/j.tsf.2021.138741. |
Appears in Collections: | Journal/Magazine Article |
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