Design Novel Structure of Polycrystalline CdTe/Silicon Solar Cells with Radial Junction and Distributed Bragg Reflector

In this paper, a new type of polycrystalline CdTe/Silicon solar cells is designed to increase the short circuit current density and conversion efficiency. The proposed structure consist of a polycrystalline CdS/CdTe solar cell with radial junction, silicon–cell junction and distributed Bragg reflector (DBR). The distributed Bragg reflector include silicon dioxide/titanium dioxide (SiO2/TiO2) layers that is inserted at the bottom of the absorber layer. In order to validate the modeling results, the electrical properties of the experimentally-fabricated based CdS/CdTe solar cell is modeled and compared. The simulation results for the reference cell are in good agreement with the experimental data reported in literature The results show that the solar cell efficiency is increased by about 30% compared to the reference cell by using radial junction. The open circuit voltage, short circuit current density, fill factor and conversion efficiency of proposed solar cell structure are 1.07 V, 51.8 mA/cm2, 0.98 and 37% under global AM 1.5 conditions, respectively. In addition, the effect of carrier lifetime variation in the absorber layer on the electrical characteristics of polycrystalline radial junction CdS/Silicon solar cell was investigated.

کلیدواژه ها:

Polycrystalline ، CdTe/Silicon ، Solar cells ، Radial junction ، Distributed Bragg reflector.