We present a hybrid thermodynamic model for multijunction solar cells with intermediate bands that demonstrates
possible improvements to conventional multijunction photovoltaic systems. Applying this model to selected tandem cell
structures shows that the performance of such hybrid solar cells is enhanced and that multiple transitions from
intermediate bands can reduce the number of material stacks and boost overall efficiency. We demonstrate the results of
detailed simulations for multiple numbers of stacks of hybrid multijunction solar cells. And, we can choose proper
materials to compose intermediate band for each junction. Furthermore, we suggest other alternative hybrid solar cell
systems to absorb moderate photon energy range and find appropriate materials for hybrid solar cells.