Light Absorption Enhancement in Laser-Crystallized Silicon Thin Films on Textured Glass

Abstract

Liquid-phase crystallization of Si films on textured glass by line-focus diode laser produces a material with large highquality grains of several hundred micrometers in width and up to centimeters in length, similar to the films crystallized on planar glass. A combination of glass texturing, rear Si texturing, white paint rear reflector, and a front moth-eye antireflection foil on a 7-μm absorber results in significant broadband absorption enhancement in the Si film with potential short-circuit current densities in solar cells of 27.8 mA/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> or 36.3% enhancement compared with a planar reference film without light-trapping features.