Fig. 5: Optical properties and energy band structure of gersiloxenes.

a UV–vis diffuse reflectance spectra and b Tauc plots of gersiloxenes (x = 0.1, 0.3, 0.5, 0.7, 0.9), GeH and Si6H3(OH)3. c The optical images of GeH, Si6H3(OH)3, and gersiloxenes with x = 0.1, 0.3, 0.5, 0.7, 0.9. d Energy band structure of gersiloxenes with different x values and GeH and Si6H3(OH)3 for CO2 reduction to CO and H2 evolution. VB valence band, CB conduction band. Source data are provided as a Source Data file.