Eg(CuI)=3.1ev
参考文献：Observation of microwave conductivity in copper iodide films and relay effect in the dye molecules attached to CuI photocathode,Journal of Solid State Chemistry,Volume 178,Issue 10,October 2005,Pages 3010-3013
Eg(Cu2S)=1.2eV
参考文献：MARSHALRL and MITRAS 1965,J.Appl.Phys.36 3882-3.