Theory and simulation of photogeneration and transport in Si-SiOx superlattice absorbers

TL;DR

This paper develops a quantum-kinetic model using non-equilibrium Green's functions to analyze photogeneration and charge transport in Si-SiOx superlattice solar absorbers, accounting for complex effects like disorder and finite well number.

Contribution

It introduces a comprehensive quantum-kinetic framework for simulating photogeneration and transport in superlattice absorbers with arbitrary geometry and conditions, including electron-photon and electron-phonon interactions.

Findings

Provides microscopic insights into indirect generation mechanisms.

Analyzes carrier relaxation and inter-well transport beyond ballistic regimes.

Accounts for effects of disorder and finite superlattice size.

Abstract

Si-SiOx superlattices are among the candidates that have been proposed as high band gap absorber material in all-Si tandem solar cell devices. Due to the large potential barriers for photoexited charge carriers, transport in these devices is restricted to quantum confined superlattice states. As a consequence of the finite number of wells, large built-in fields and any kind of disorder, the electronic spectrum can deviate considerably from the minibands of a regular superlattice. In this paper, a quantum-kinetic theory based on the non-equilibrium Green's function formalism for an effective mass Hamiltonian is used to investigate photogeneration and transport in such devices for arbitrary geometry and operating conditions. By including the coupling of electrons to both photons and phonons, the theory is able to provide a microscopic picture of indirect generation, carrier relaxation and inter-well transport mechanisms beyond the ballistic regime.