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Herein, high-quality centimeter-scale 2D Bi2O2Se films are successfully synthesized to reveal the lattice dynamics and dielectric functions underneath the control of thickness and temperature. It's been shown that the stronger electrostatic Bi-Se interactions end in a stiffened phonon vibration of thicker Bi2O2Se layers. Three excitons (Ea, Eb, and Ec) display significant red shifts with level stacking. Interestingly, the dielectric properties within the visible-near infr
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