Patent ID: 6255580
Filing Date: 2001-07-03
Classification: H01L,Y02E

Abstract:
A photovoltaic cell, comprising:a base layer having a first type of doping;an emitter layer having a second type of doping, said emitter layer being disposed over said base layer;a primary window layer of a primary thickness, said primary window layer being made of a first composition and having said second type of doping, said primary window layer being disposed over said emitter layer; anda secondary window layer of a secondary thickness that is less than said primary thickness, said secondary window layer being made of a second composition that is different from said first composition and having said second type of doping, said secondary window layer being disposed over said primary window layer to passivate and reduce minority-carrier recombination at the surface of said primary window layer due to an energy bandgap difference between said primary and secondary window layers of about 0.030 to 1.0 eV.