Abstract: My talk will highlight new directions in probing semiconductor electrochemistry and reactivity at the single-particle and single-molecule level. I will discuss our recent discovery that the band gap renormalization (BGR) effect in 2D semiconductors strongly dictates their current–voltage behaviorin electrochemical cells, providing a new framework to understand solid-state transistor device performance variability. I will then describe how single-particle photoelectrochemistry of BiVO₄ reveals unexpected facet-dependent heterogeneity that links structural defects and surface terminations to reactivity. Finally, I will present super-resolution imaging results of surface defect states in semiconductor nanocrystals, where direct visualization opens new possibilities for correlating local electronic structure with photophysical function. Together, these studies illustrate how multi-scale imaging and spectroscopy can unravel fundamental mechanisms of charge generation, separation, and storage in semiconductor materials for energy conversion.
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