(A) EXAFS curves of Cu foil and Cu-CN. (B) The data of EXAFS curves and the fit of Cu-CN. (C) The raised configuration of Cu-CN in a T-defect. ESR of p-CN and Cu-CN (D) before and (E) during illumination. (F) Top view of the distribution of electron density. (G) Side view of the distribution of electron density. The yellow and green isosurfaces represent an augment in the number of electrons and the depletion zone, respectively. The isosurfaces are 0.003 e Å⁻³. (H) PDOS of C and N atoms of T-defect in Cu-CN. (I) PDOS of Cu atoms, donor N atoms, and C atoms bound with the donor N atoms. Adapted with permission from Ref. [59], copyright 2018 Springer Nature.