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Inorganic semiconductors based on heavy pnictogen cations (Sb3+ and Bi3+)have gained significant attention as potential nontoxic and stable alternativesto lead-halide perovskites for solar cell applications. A limitation of thesenovel materials, which is being increasingly commonly found, is carrierlocalization, which substantially reduces mobilities and diffusion lengths.Herein, the layered p\v{r}\'ibramite CuSbSe2 is investigated and discovered tohave delocalized free carriers, as shown through optical pump terahertz probespectroscopy and temperature-dependent mobility measurements. Using acombination of theory and experiment, it is found that the underlying factorsare: 1) weak coupling to acoustic phonons due to low deformation potentials, aslattice distortions are primarily accommodated through rigid inter-layermovement rather than straining inter-atomic bonds, and 2) weak coupling tooptical phonons due to the ionic contributions to the dielectric constant beinglow compared to electronic contributions. This work provides important insightsinto how pnictogen-based semiconductors avoiding carrier localization could beidentified.

Factors Enabling Delocalized Charge-Carriers in Pnictogen-Based Solar Absorbers: In-depth Investigation into CuSbSe2