Introduction: The effluence of Bi3+ doping on the microstructure and property of
the undoped and Bi3+-doped Cu2Se films deposited by chemical bath deposition were studied.
Methods: The films showed average UV-visible transmittances of ~73.29-84.10 % that increased
with increasing Bi3+ content. The optical bandgaps calculated from optical spectra increased
with increasing Bi3+ content. Strong bandgap emission at ~629 nm was also observed.
Moreover, the films had actual Se/Cu<2 and n-type conductive.
Result: The sheet resistance of ~4.13-96.44×10-3 Ω·cm first decreased and then increased
with the increase in Bi content.
Conclusion: Various optical constants of the films were estimated with the UV-visible light