Investigation of Using Anti-Reflecting Coatings in CZTS Solar Cells to Enhance the Light Absorption: Optimization by FDTD Method

In the few past years, Solar cells based on Cu2ZnSnS4 (CZTS) are very promising thin-film solar cells due to their appropriate absorption coefficient and optical band gap, low-cost, non-radioactive and environmental friendly behavior. However, CZTS devices show poor efficiency and identifying deficiencies and making improvements is necessary. In the present study, various anti-reflection coatings at the top surface of the solar cell were proposed. Minimization of the reflectance is carried out to optimize the thickness of ARC layers using Lumerical software. The density of the short-circuit photocurrent increases from 18.4 mA.cm−2 for solar cells without an antireflection coating to 36 mA.cm−2 for those with MgF2 layer coating.