Three approaches to obtain flexible ferroelectrics are discussed. The fabrication of freestanding films by etching the substrates allows one to tap on the available perovskite oxide family. Apart from that, van der Waals epitaxy on flexible mica has proved to be a promising technology to create flexible ferroelectrics. Compared with these two methods, the discovery of novel two-dimensional ferroelectric materials eliminates the substrate constraint and extends the candidates of ferroelectric materials for flexible electronics.
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Chang et al. (2018) studied this question.
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