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The development of 2D materials with excellent electronic properties and piezoelectric response is clearly critical for multifunctional piezoelectric devices. Herein, based on first‐principles calculations, the electronic, mechanical, and piezoelectric properties of a series of 2D copper‐based ternary chalcogenides, denoted as CuMX2 (M = Sb and Bi; X = S and Se) monolayers, are systematically studied,...