Complementary Chalcogen Ordering Enables Energetically Favorable and Multifunctional Two-Dimensional Transition-Metal Dichalcogenides.
In conventional two-dimensional (2D) transition-metal dichalcogenides (TMDCs), intrinsic mirror symmetry forbids out-of-plane dipoles and suppresses symmetry-enabled properties. Janus TMDCs provide a direct route to mirror-symmetry breaking; however, their chemically inequivalent surfaces often introduce local strain i...