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Based on first-principles lattice dynamics and electron-phonon couplingcalculations, B2C sheet is predicted to be a two-dimensional (2D)phonon-mediated superconductor with a relatively high transition temperature(Tc). The electron-phonon coupling parameter calculated is 0.92, and it ismainly contributed by low frequency out-of-plane phonon modes and electronicstates with a {\pi} character. When the Coulomb pseudopotential is set to 0.10,the estimated temperature Tc is 19.2 K. To be best of our knowledge, B2C is thefirst pristine 2D superconductor with a Tc higher than the boiling point ofliquid helium.

A First-principles Prediction of Two-Dimensional Superconductivity in Pristine B2C Single layer