Novel Design of polycrystalline CdTe/Si Tandem Solar Cells Using SiO2/TiO2 Distributed Bragg Reflector
Keywords:Novel design, CdTe/Si, SiO2/TiO2, Tandem Solar Cells, Distributed Bragg reflector (DBR)
In this paper, a polycrystalline cadmium telluride/silicon (CdT e/Si) solar cell based
on SiO2/T iO2 distributed Bragg reflector (DBR) is proposed and investigated using calibrated simulations with experimental data of previous fabrication device. At first, by inserting the SiO2/T iO2 DBR, the conversion efficiency is increased by
about 25% compared with the conventional CdT e/Si solar cell with similar dimensions. In addition, the carrier lifetime of absorber layer can provide an improved conversion efficiency of 15% compared with the CdT e/Si conventional solar cell.
The obtained open circuit voltage, short circuit current density, fill factor and conversion efficiency of proposed solar cell structure were about 1.2V, 39.5mA/cm^2 , 0.95 and 28.5% under global AM 1.5 conditions, respectively. The results strongly confirm that the polycrystalline CdT e/Si solar cell based on SiO2/T iO2 DBR seems to be the most optimal choice for converting the solar energy in high efficiency