Table 4.

Activation energies of subbands detected in Cu₂O single-crystal samples (obtained with an error of ≈15%).

Sample		Ea, eV 660 nm	Ea, eV 680 nm	Ea, eV 720 nm	Ea, eV 810 nm	Ea, eV 920 nm
Cu2O single crystal @ laser irradiation power	SC (111) @ 0.2 mW			80		150
	SC (111) @ 15 mW			93		190
	SC (100) @ 0.2 mW			89	22	135
	SC (100) @ 15 mW			97	20	197
Cu2O thin films	111		32	77	42	15 + 37
	13		36	43	62	65
	30		41	59	33	22
	39		59	86	37	12 + 126
	40	32	40	55	37	18 + 247