Modeling of CdZnTe/CdTe/Si triple junction solar cells

Using Crosslight APSYS, we have made two-dimensional simulation of triple junction solar cells based on the CdZnTe/CdTe/Si material system with tunnel junctions. The basic physical quantities like band diagram, optical absorption and generation for the modeled TJ cell, and external quantum efficiency for individual sub cell junctions are obtained. Current matching analyses and multi-sun concentration simulation are performed and the presented results indicate cell efficiency 34.92% (one sun) and maximum 39.09% (around 500-700 sun). The results indicates that II-VI CdZnTe and CdTe based materials can be used to develop multi-junction solar cell on silicon substrate with cell efficiency comparable to those III-V based compound on Ge substrate.