Can magnetotransport properties provide insight into the functional groups in semiconducting MXenes?

Hall scattering factors of Sc 2 CF 2 , Sc 2 CO 2 and Sc 2 C(OH) 2 are calculated using Rode's iterative approach by solving the Boltzmann transport equation. This is carried out in conjunction with calculations based on density functional theory. The electrical transport in Sc 2 CF 2 , Sc 2 CO 2 and Sc 2 C(OH) 2 is modelled by accounting for both elastic (acoustic and piezoelectric) and inelastic (polar optical phonon) scattering. Polar optical phonon (POP) scattering is the most significant mechanism in these MXenes. We observe that there is a window of carrier concentration where the Hall factor acts dramatically; Sc 2 CF 2 obtains an incredibly high value of 2.49 while Sc 2 CO 2 achieves a very small value of approximately 0.5, and Sc 2 C(OH) 2 achieves the so called ideal value of 1. We propose in this paper that such Hall factor behaviour has significant promise in the field of surface group identification in MXenes, an issue that has long baffled researchers.