A simplified method to modulate colors on industrial multicrystalline silicon solar cells with reduced current losses

摘要

This paper investigates the impact of SiO_xN_y/SiN_x:H double layer antireflection (DLAR) coatings on color modulation and cell efficiencies of multicrystalline silicon (mc-Si) solar cells. We presented a three dimensional ellipsoid surface model to simulate the concave-like morphology formed by acidic texturization. Afterwards, reflectivities of these acidic textures coated by DLAR coatings over 300-1100 nm are calculated by Monte Carlo ray tracing method. Simulated results show that DLAR coatings can flexibly modulate the color with reduced current losses compared to single SiN_x:H layer. SiO_xN_y, was deposited by electron beam evaporation onto fabricated industrial solar cells to vary their colors. The busbars were sheltered by a mask to prevent the deposition of SiO_xN_y, on them. This simplified method avoids adjustment of the standard fabricating process. High agreement between simulated and measured reflectance is achieved. The Ⅳ test results of colored solar cells are in good accord with the calculated results, which indicates the effectiveness of DLAR coatings in reducing the current losses.