A unified mathematical framework for intermediate band solar cells

Lin, Albert; Fu, Sze-Ming; Zhong, Yan-Kai

doi:10.1109/pvsc.2012.6317572

Cited by 3 publications

(1 citation statement)

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“…In both cases, the occupation of the charge carriers' states will change, so reducing the light absorption. However, the QDSL absorption spectrum in thermal equilibrium gives a theoretical indication, and, e.g., its values could be used in a model for optical absorption based on minibands' capture and emission rates [46], which is already considered the charge carrier states' occupation. Another approximation used here is on QDs' geometrical structure.…”

Section: Qdsl Minibands and The Interminibands Absorption Coefficientmentioning

confidence: 99%

Modeling of the Interminiband Absorption Coefficient in InGaN Quantum Dot Superlattices

2016

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Abstract:In this paper, a model to estimate minibands and theinterminiband absorption coefficient for a wurtzite (WZ) indium gallium nitride (InGaN) self-assembled quantum dot superlattice (QDSL) is developed. It considers a simplified cuboid shape for quantum dots (QDs). The semi-analytical investigation starts from evaluation through the three-dimensional (3D) finite element method (FEM) simulations of crystal mechanical deformation derived from heterostructure lattice mismatch under spontaneous and piezoelectric polarization effects. From these results, mean values in QDs and barrier regions of charge carriers' electric potentials and effective masses for the conduction band (CB) and three valence sub-bands for each direction are evaluated. For the minibands' investigation, the single-particle time-independent Schrödinger equation in effective mass approximation is decoupled in three directions and resolved using the one-dimensional (1D) Kronig-Penney model. The built-in electric field is also considered along the polar axis direction, obtaining Wannier-Stark ladders. Then, theinterminiband absorption coefficient in thermal equilibrium for transverse electric (TE) and magnetic (TM) incident light polarization is calculated using Fermi's golden rule implementation based on a numerical integration into the first Brillouin zone. For more detailed results, an absorption coefficient component related to superlattice free excitons is also introduced. Finally, some simulation results, observations and comments are given.

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Section: Qdsl Minibands and The Interminibands Absorption Coefficientmentioning

confidence: 99%