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We numerically investigate the high-efficiency photovoltaic effect in lateralp-n homojunction based on monolayer black phosphorus (MBP) by using thenon-equilibrium Green's function combined with the density functional theory.Due to the built-in electric field of the p-n junction and the wrinklestructure of MBP, the photocurrent excited by either linearly or ellipticallypolarized light is significantly enhanced in a wide photon energy range.Moreover, because of the electron-photon interaction, the photocurrent isrelated to atomic orbitals through the polarizing angle of polarized light.Therefore, we can read the orbital information of the band structure from thepolarizing angular distribution of photocurrent. These findings suggest thepromising application of MBP-based p-n homojunction in high-efficiencyphotoelectric devices and orbital-resolved photovoltaic detection.

High-efficiency photoelectric detector based on a p-n homojunction of monolayer black phosphorus