Microscopic non-equilibrium theory of quantum well solar cells

Details Microscopic non-equilibrium theory of quantum well solar cells Microscopic non-equilibrium theory of quantum well solar cells

2007-09-26

arxiv.org/abs/0709.4131v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 6 figures; corrected typos, changed caption Fig. 1, replaced Fig. 5

Scientific paper

10.1103/PhysRevB.77.125343

We present a microscopic theory of bipolar quantum well structures in the photovoltaic regime, based on the non-equilibrium Green's function formalism for a multi band tight binding Hamiltonian. The quantum kinetic equations for the single particle Green's functions of electrons and holes are self-consistently coupled to Poisson's equation, including inter-carrier scattering on the Hartree level. Relaxation and broadening mechanisms are considered by the inclusion of acoustic and optical electron-phonon interaction in a self consistent Born approximation of the scattering self energies. Photogeneration of carriers is described on the same level in terms of a self energy derived from the standard dipole approximation of the electron-photon interaction. Results from a simple two band model are shown for the local density of states, spectral response, current spectrum, and current-voltage characteristics for generic single quantum well systems.

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