GaAs//CuIn 1−y Ga y Se 2 Three-Junction Solar Cells With 28.06% Efficiency Fabricated Using a Bonding Technique Involving Pd Nanoparticles and an Adhesive

Multijunction (MJ) solar cells haveattracted attention as next-generation solar cells. In particular, III–V-based MJ solar cells connected with heterogeneous cells, such as GaAs//Si and GaAs//CIGSe (CuIn1−yGaySe2), are expected to be highly efficient and low cost. In this article, we demonstrate a highly efficient InGaP/Al0.06Ga0.94As//CIGSe t...