The hybrid structure of GaAs/GaAsSb quantum well (QW)/InAs quantum dots solar cells (QDSCs) is analyzed using power-dependent and temperature-dependent photoluminescence. We demonstrate that placing the GaAsSb QW beneath the QDs forms type-II characteristics that initiate at 12% Sb composition. Current density-voltage measurements demonstrate a decrease in power efficiency with increasing Sb co...

Semiconductor quantum dots (QDs) have been drawing great attention recently as a material for solar energy conversion due to their versatile optical and electrical properties. The QD-sensitized solar cell (QDSC) is one of the burgeoning semiconductor QD solar cells that shows promising developments for the next generation of solar cells. This article focuses on recent developments in QDSCs, inc...

The goal of this NU-Argonne collaborative project is to explore quantum confinement in atomiclayer semiconductors. Quantum confinement in three-dimensional semiconductor crystals has improved energy conversion efficiency in nanocrystal quantum dot solar cells [1]; translating this approach to two dimensional (2D) materials can offer similar absorption enhancement with higher energy absorption d...

We investigate the dynamics of a plasmonic oscillation over a metal nanoparticle when it is strongly coupled to a quantum emitter (e.g. quantum dot, molecule). We simulate the density matrix evolution for a simple model, a coupled classical-quantum oscillators system. We show that the lifetime of the plasmonic oscillations can be increased several orders of magnitude, up to the decay time of th...

n the current intermedíate band solar cells made with InAs quantum dots (QDs) in GaAs, the ransitions by absorption of photons between the intermedíate band and the conduction band for llumination normal to the cell surface is very weak or, more often, undetectable. We model the QD as a jarallelepiped potential well and calcúlate the envelope function of the electrón wavefunctions. By jbtaining...

The past few years have been great for semiconductor quantum dot-sensitized solar cells (QDSSCs). For the first time, efficiency exceeding 15% has reported. This narrowed gap with other emerging cell technologies such as dye-sensitized and thin film cells. In this miniperspective, reason improvement is briefly reviewed. Few advancements identified that are responsible performance breakthrough i...