Emerging polar nitride perovskites have recently attracted considerable attention for ferroelectric photovoltaic applications owing to their smaller band gaps compared with conventional oxide perovskites. Carrier mobility is a key performance parameter governing charge transport and device efficiency; however, quantitative understanding of carrier mobility in nitride perovskites remains limited. Here, we systematically investigate the charge-carrier transport properties of eight nitride perovskites using first-principles density-functional theory combined with Boltzmann transport calculations. The results reveal that these materials exhibit bandlike transport behavior, with room-temperature carrier mobilities ranging from 2 to $23\mathrm{c}{\mathrm{m}}^2{\mathrm{V}}^{-1}{\mathrm{s}}^{-1}$. These values are comparable to those of doped ${\mathrm{SrTiO}}_3$, but somewhat lower than those of typical halide perovskites. Among the investigated compounds, $\mathrm{YW}{\mathrm{N}}_3$ exhibits the highest electron mobility ($22.19\mathrm{c}{\mathrm{m}}^2{\mathrm{V}}^{-1}{\mathrm{s}}^{-1}$), whereas $\mathrm{CeTa}{\mathrm{N}}_3$ shows the highest hole mobility ($22.16\mathrm{c}{\mathrm{m}}^2{\mathrm{V}}^{-1}{\mathrm{s}}^{-1}$). We identify piezoelectric scattering as the dominant mechanism limiting carrier mobility in most of the investigated nitride perovskites, while polar optical phonon scattering plays a comparable role. In contrast, polar optical phonon scattering becomes the primary mobility-limiting mechanism in $\mathrm{CeNb}{\mathrm{N}}_3$ and $\mathrm{YMo}{\mathrm{N}}_3$, reflecting stronger electron-phonon coupling in these compounds. Furthermore, we develop two simplified conceptual models to explain the observed mobility trends across the material series. Based on these models, Young's modulus and carrier effective mass are identified as the key physical descriptors governing carrier mobility in nitride perovskites. Our results establish the intrinsic mobility limits and provide fundamental insights into carrier transport in nitride perovskites, offering important guidance for the design and optimization of nitride-perovskite-based ferroelectric photovoltaic devices.

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• Carrier dynamics
• Electrical conductivity
• Perovskites
• Boltzmann theory
• Density functional calculations