Photoluminescence Properties of Li-Doped ZnSe Films Grown by Metalorganic Chemical Vapor Deposition

Lithium-doped ZnSe films have been grown by atmospheric metalorganic chemical vapor deposition. Dimethylzinc and dimethylselenide were used as source materials and cyclopentadienyl lithium was used as a dopant. The films have been characterized by a low-temperature photoluminescence. It is shown that the lithium acts as a shallow acceptor in ZnSe with an activation energy of about 101–118 meV. Furthermore, it is shown that the intensity of emission from deep centers, such as so-called self-activated and copper-green emission, is remarkably reduced in lithium-doped ZnSe films.