Patent ID: 9076915
Filing Date: 2015-07-07
Classification: H01L,Y02E,Y02P

Abstract:
1. A monolithic, quadruple junction solar cell, comprising: a first cell comprising Ge with a bandgap of about 0.67 eV; a second cell comprising GaAs that is isoelectronically co-doped with a Group III acceptor element and a Group V donor element, to have a bandgap of about 1.05 eV on the first cell, wherein the Group III acceptor element is B and the Group V donor element is Bi to form a GaAs:Bi:B crystal lattice; a third cell comprising GaAs with a bandgap of about 1.42 eV on the second cell; and a fourth cell comprising InGaP with a bandgap of about 1.90 eV on the third cell.