Introducing novel intermediate band materials for high-efficiency solar cells based on znse doped with transition metals

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International Journal of Development Research

Introducing novel intermediate band materials for high-efficiency solar cells based on znse doped with transition metals

Abstract: 

Solar cell materials with more than one bandgap offer the possibility to increase the efficiency of the solar cell beyond that of a single bandgap cell. In the present study comprehensive analysis is carried out on ZnSe doped with transition metals. Theoretical studies confirm the formation of suitable mini-bands within ZnSe band gap by doping of transition metals. The mini bands mainly are created by nd orbitals of the transition metals. Absorption coefficient, density of states and band structure are three important features of the proposed materials. Here, we calculated these characteristics for the ZnSe doped with TM=V, Cr, Mn, and Fe as candidates for presenting an isolated partially-filled narrow bands between the valance band and the conduc- tion band. The absorption coefficient in sub-band-gap energy is greatly improved by the induction of the IB compared to the ZnSe host. The simulation shows that ZnSe(V) and ZnSe(Cr) can be create desired IB in in comparison to Mn and Fe.

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