CHIRPED DISTRIBUTED BRAGG REFLECTORS FOR PHOTOVOLTAIC CELLS AND OTHER LIGHT ABSORPTION DEVICES

Semiconductor light absorption devices such as multi -junction photovoltaic cells include a chirped distributed Bragg reflector beneath a junction. The chirped distributed Bragg reflector provides a high reflectivity over a broad range of wavelengths and has improved angular tolerance so as to provide increased absorption within an overlying junction over a broader range of wavelengths and incident angles. 诸如多结光伏电池的半导体光吸收装置包括在结下方的啁啾分布式布拉格反射器。啁啾分布式布拉格反射器在大波长范围内提供高反射率，并且具有改进的角容差，以便在大波长范围和入射角上在上覆结内提供增加的吸收。