Band gap properties of Zn_(1-x)Cd_xO alloys grown by molecular-beam epitaxy

摘要

Optical absorption and reflectance measurements are performed to evaluate compositional and temperature dependences of band gap energies of Zn_(1-x)Cd_xO alloys grown by molecular-beam epitaxy. The compositional dependence of the band gap energy, determined by taking into account excitonic contributions, is shown to follow the trend E_g(x) = 3.37-2.82x+0.95x~2. Incorporation of Cd was also shown to somewhat slow down thermal variation of the band gap energies, beneficial for future device applications.