enhancing efficiency of twobond solar cells based on gaas/ingap

Multi-junction solar cells play a crucial role in the concentratedphotovoltaic (cpv) systems. recent developments in cpv concerning high powerproduction and cost effectiveness along with better efficiency are due to theadvancements in multijunction cells. this paper presents a simulation model of thegeneralized multijunction solar cell and introduces a twobond solar cell based oningap/gaas with an algaas/gaas tunnel layer.for enhancing the efficiency of theproposed solar cell, the model adopts absorption enhancement techniques as well asreducing loss of recombination by manipulating number of junctions and varying thematerial properties of the multijunctions and the tunneling layer. the proposed multijunctionsolar cell model employing tunnel junctions can improve efficiency up to by35.6%. the primary results of the simulation for the proposed structure indicate that it ispossible to reduce the loss of recombination by developing appropriate lattice matchamong the layers; it is also likely to have suitable absorption level of the phonons.simulation results presented in this paper are in agreement with experimental results.