Textured window with DLAR coating design for an effective minimization of electrical and optical losses in an efficient III-V solar cell

摘要

Performances of solar cells with different window materials and structures have been analysed and compared. Four different materials with varied thickness have been used for comparison. An efficient thin textured window layer design with double layer anti reflection coating for III-V solar cell is then proposed. The optimum window is obtained with 18nm InAlP material and further optimized with four sided textured surface coated with 125nm double antireflective layer of Al2O3-TiO2. Our design shows minimum reflection and absorption loss in the wavelength range of 200-650nm and better transmission for rest of the higher wavelength when illuminated with AM1.5G spectrum. Performance variation with different doping concentration on this layer is also investigated. At about 1 x 10(17) cm(-3) carrier concentration, EQE of the cell is found to be well above 95%. The model has been validated with experimental data available from various recent literatures.