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We study spatial photoluminescence characteristics of neutral and chargedexcitons across extended monolayer MoS$_2$ synthesized by chemical vapordeposition. Using two-dimensional hyperspectral photoluminescence mapping atcryogenic temperatures we identify regions with increased emission from chargedexcitons associated with both spin-orbit split valence subbands. Such regionsare attributed to unintentional doping at defect sites with excess charge thatbind neutral excitons to form defect-pinned trions. Our findings implycomparable timescales for the formation, relaxation, and radiative decay of $B$trions, and add defect-localized $A$ and $B$ trions to the realm ofphotoexcited quasiparticles in layered semiconductors.

Signatures of defect-localized charged excitons in the photoluminescence of monolayer molybdenum disulfide