A promising two-dimensional solar cell donor: Black arsenic-phosphorus monolayer with 1.54 eV direct bandgap and mobility exceeding 14,000 cm2 V−1 s−1

The maximum PCE of monolayer α-AsP/GaN-based excitonic solar cell (XSC) could achieve 22.1%, which is competitive with the best to date in 2D thin-film solar cells.308