[13p-A202-1~17] 13.9 Compound solar cells

[13p-A202-4] Three-terminal tandem solar cells with a back-contact-type bottom cell

〇Takeshi Tayagaki¹, Kikuo Makita¹, Tomihisa Tachibana¹, Hidenori Mizuno¹, Ryuji Oshima¹, Hidetaka Takako¹, Takeyoshi Sugaya¹ (1.AIST)

Keywords:solar cell

Multijunction solar cells, which are copmosed of stacked PN junctions with different absorption bands, can achieve high efficiency by effectively utilizing the solar spectrum. Typical multijunction solar cells are a two-terminal type, in which sub-cells are connected in series, but there is a problem in mismatch loss due to fluctuation in solar spectrum due to current matching between cells. Against this background, we have investigated three-terminal multijunction solar cells. The smart stack technology for stacking solar cells using Pd nanoparticles is a technology for easily forming multijunction solar cells. In this study, we used smart stack technology to develop back-contact-type solar cells. A three-terminal tandem solar cell using a back-contact-type Si bottom cell was fabricated.