Tunneling Conductivity of III-V Multiquantum Well P-I-N Photovoltaic Heterostructures by Means of the Causal Green’s Function
نویسنده
چکیده
The generalized Kubo-Greenwood formula for conductivity is used for an explicit calculation of the perpendicular conductivity of GaAs-AlGaAs (crystalline III-V) heterostructures. Two cases are discussed (a) evaluation of DC conductivity at low temperatures and (b) AC conductivity at any temperature T. The method involves the causal Green’s function and relates the conductivity with superlattice (multilayer) parameters such as repeat distance, miniband energies and their corresponding widths, and the Fermi level. Analytical results are derived that are applicable to III-V photovoltaic structures with multiple layers and non-zero tunneling. Key-Words: Green’s function, Photoconductivity, Superlattices, Solar cells
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