Physical properties of Mn Dopped CuAlS2 pyrolytic thin films

الملخص EN

CuAlS2:Mn thin films were prepared by spray pyrolysis technique.

The prepared films were deposited on the glass substrate temperature Ts of 613οK.

The optical properties were studied as a function of Mn doping concentration.

The estimated direct energy gaps are in the range (3.29-2.92)eV for Mn concentration range (0.1-5) wt%.

The DC electrical conductivity of pyrolytic-sprayed CuAlS2 thin films doped with Mn is measured in the temperature range (300-400οK).

The doping concentration ranges from 0% to 5% by weight.

In the lower temperature region, the conductivity and the activation energy are functions of doping concentration for less than 0.7%.

However they are nearly constant for concentration more than 0.7%.

In contrast for what is expected, the overall conductivity decreases with a doping concentration.

Under the band model, the behavior of the electric conductivity is attributed to the existence of donor’s levels and the effect of replacement of Mn in the Al site as a favorable one.