The efficiency of indium phosphide solar cells might be improved by a
wide-band-gap window layer. In this work we calculate the performance
of InP solar cells with a strained (pseudomorphic) In0.40Al0.60As wind
ow layer. Calculations show that the efficiencies of baseline and opti
mized p+n cells are increased to more than 22% and 24% (AM0, 25-degree
s-C), respectively, for In0.40Al0.60As window layer of 10 nm thickness
. Comparatively little improvement is found for n+p cells.