Improving the performance of amorphous silicon photovoltaic modules (original) (raw)
High performance amorphous silicon solar cells require high quality undoped hydrogenated amorphous silicon (diffusion lengths greater than or equal to 0.5 pm), a conductive p layer or n layer window (Op > 10-6 ~-i cm-1, eopt >~ 2 .0 eV), an effective light trapping geometry such as textured tin oxide, a reflective back contact (e.g. silver) and low contact resistance (less than 0.5 gt cm:). Requirements for high module performance require low interconnect resistance (e.g. less than 5 × 10-a Ft cm: for the A1-SnO2 contact), large percentage of active area and good uniformity of material properties over large areas. New developments such as superlattice doped layers and improved tin oxide texturing have led to efficiencies as high as 10.9% in small cells (1 cm2). Processing improvements have led to efficiencies of 8.1% in 1 ft 2 modules patterned entirely by laser scribing.
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