Solar Cell Consider a GaAs PN junction solar cell with the following parameters. Na=10^17 cm^-3, Nd= 2*10^16 cm^-3, Dn=190 cm^2/s, Dp=10 cm^2/s, Tn0=10^-7s, and Tp0=10^-8s. Assume a photocurrent density of JL=20mA/cm^2 is generated in the solar cell.
A) Calculate the open-circuit voltage.
B) Determine the ratio of open-circuit voltage to built-in potential barrier.