  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.
