upward

FeO

Iron oxide (Wikipedia)


Z Zhou, R Long, O V Prezhdo, Why Silicon Doping Accelerates Electron Polaron Diffusion in Hematite, JACS 141, 20222 (2019) – coo

A Braun, K Sivula, D K Bora, J Zhu, L Zhang, M Gratzel, J Guo, E C Constable, Direct Observation of Two Electron Holes in a Hematite Photoanode during Photoelectrochemical Water Splitting, JPCC 116, 16870 (2012)