Anodic aluminum oxide gratings for enhanced light trapping in thin film silicon solar cells

摘要

Reduction of surface reflection in silicon solar cells is important for achieving high conversion efficiencies. Anodic aluminum oxide (AAO) grating on the upper side of solar cells can achieve such reflection reduction. In our work, finite difference time domain (FDTD) method is used to study the relationship between AAO's geometrical parameters and optical characteristic of thin Si solar cell. Simulation results show that, the optimum structure parameter of AAO is 440 run for period, 0.5 for duty circle and 75 nm for thickness. Absorption spectrum shows that, AAO in best parameters can reduce the reflection in the wavelength range from 280 to 700 nm. Parameter tolerance analyzing of AAO shows that, choosing AAO as anti-reflection material allows a tolerance of more than ±10 % for period and ±5 % for thickness.