Anti-reflective coating film, solar cell including the anti-reflective coating film, and method of predicting strength of the anti-reflective coating film for the solar cell

A method of predicting a strength of an anti-reflective coating film for a solar cell, the method comprising:

• measuring a coating solution composition comprising a silane-based precursor via Fourier Transform Infrared (FT-IR) Spectroscopy using a wavelength of 1064 nm, for a peak intensity ratio IB/IA and a peak intensity ratio IC/IA respectively, wherein the peak intensity IB represents a Si—OH bond in a range of about 930 cm−1 to about 960 cm−1;
• the peak intensity IA represents a Si—O—Si bond in a range of about 1110 cm−1 to about 1130 cm−1;
• and the peak intensity IC represents a Si—O—R (wherein R is a C1-C5 alkyl) in a range of about 1020 cm−1 to about 1050 cm−1, respectively;
• and
• predicting whether the anti-reflective coating film has a strength equal to or greater than a pencil hardness 4H based on the peak intensity ratio IB/IA and the peak intensity ratio IC/IA.