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Two-diode model parameter evaluation from dark characteristics of back-contact back-junction solar cells

Abstract:

The back-contact back-junction (BC-BJ) solar cells is a novel structure that increases the optoelectronic performance of the device. The two-diode model provides information regarding the different process involved in the BC-BJ solar cell operation, through the behavior of the dark current-voltage (I-V) curve, at different distances (from 200Â µm to 900Â µm) and widths of the emitter-Al (from 50Â µm and 100Â µm). Simulated results indicate that smaller width increase the performance and efficiency. In the analyzed model we get into the performance, qualities and dimensions through of electrical simulations, using the Technology Computer-Aided Design (TCAD). The saturation current densities and parasitic resistance are determined through the adjustment and optimization of the dark (I-V) curve, resulting that the longer distance the emitter increases the dark series resistance; also, the dark saturation current density is greater by decreasing the width of the emitter.