Approaches for High-Efficiency III-V/Si Tandem Solar Cells

The Si tandem solar cells are very attractive for realizing high efficiency and low cost. This paper overviews current status of III-V/Si including our results. analytical results potential loss analysis bottom as well bandgap energy optimization sub-cells presented. 2-junction 3-junction have efficiencies 36% 42%, respectively. ERE (external radiative efficiency) is analyzed in order to clarify properties cells. Properties single-crystalline heterojunction cell fabricated this study were analyzed. cell, upper III-V was shown be 5.2% 28.6% 33.8%. Achievement Jsc 12 mA/cm2 necessary realize high-efficiency with an more than 37%. In addition, presents improving Several ways improve by reducing non-radiative recombination, optical resistance losses shown.