The conversion efficiency of a Schottky barrier solar cell can be expressed by
where Vmp is the voltage at maximum power output, Pin = 100 mW/cm2 for AM1.5G sunlight, Aj is the cell area,
where I0 is the reverse saturation current; Vmp is related to I0 and Iph via the following relation:
Equation (3) can be solved iteratively for Vmp. By substituting (2) into (1), the conversion efficiency can be calculated as a function of φBn.
Calculate the conversion efficiency ηc for an Al-n-Si Schottky barrier solar cell. Given: φBn = 0.71 eV, A∗∗ = 110A/(cm2 · K2), Aj = 4 cm2, and Iph = 140 mA. Repeat for a Au-n-type Si Schottky barrier solar cell with φBn = 0.81 eV.
