A solar cell has an open circuit voltage value of 0.55 V with a reverse saturation current

Question:

A solar cell has an open circuit voltage value of 0.55 V with a reverse saturation current density of Jo = 1.9 × 109 A/m2. For a temperature of 25oC, determine
(a) The current output density Js
(b) The load voltage at which the power output is maximum
(c) The maximum power output of the cell for a unit cell area.