Efficiency Limit of Intermediate Band AlxGa1-xAs Solar Cell Based on AlyGa1-ySb Type-II Quantum Dots Embedded Outside of the Depletion Region

TL;DR

This paper theoretically investigates the efficiency limits of intermediate band GaAs solar cells incorporating self-organized strained AlyGa1-ySb type-II quantum dots outside the depletion region, highlighting their potential to enhance photocurrent.

Contribution

It introduces a theoretical analysis of how AlyGa1-ySb quantum dots can improve intermediate band solar cell performance by leveraging type-II band alignment and self-organization.

Findings

Quantum dots enable additional photon absorption pathways.

Strained type-II quantum dots can be effectively embedded outside the depletion region.

Potential for increased photocurrent and efficiency in IB solar cells.

Abstract

The intermediate band (IB) cell is a concept of highly efficient solar cells proposed by Luque and Marti in 1997. The IB concept uses nonlinear effect of two photon absorption enforced with concentration of such photons for generation of additional photocurrent in single p-n-junction cells. In this theoretical work we demonstrate an important role of self-organized strained type-II AlyGa1-ySb quantum dots for operation in IB GaAs solar cells.