Photovoltaic performance of lattice-matched gallium indium arsenide/germanium stannide dual-junction cell

Based on the photovoltaic properties and tandem solar cells theory, Gallium Indium Arsenide/Germanium Stannide (GaInAs/GeSn)-based double-junction (DJ) solar cells have been numerically simulated for the first time. In this study, we explore the band gap combination under lattice matching and obtain the content of In/Sn at optimal efficiency, which is expressed as Ga0.84In0.16As/Ge0.93Sn0.07 DJ solar cell (1.20/0.58 eV). Afterward, it is optimized in terms of variation in the doping contents and active layer thickness. To take full advantage of the electron mobility of the material, the optimal 'inverted doping profile' concentration N (a(d)) is 1.5(5)/5(20) x 10(18) cm(-3). In addition, the reasonable p(n) layer thickness could be comprised of 0.2-0.8(0.2-1)/0.5-3(1-4) & mu;m of the DJ solar cells with less material consumption. When the p(n) layer thickness is 0.30(0.25)/0.9(1.35) & mu;m, the tandem device can achieve an optimal efficiency of 31.00% with 28.98 mA cm(-2) (J (sc)), 1.25 V (V (oc)) and 85% (FF). This study highlights that GeSn materials have the potential to combine with III-V materials to form low-cost and high-efficiency tandem devices.