A two-dimensional (2D) analytical model based on the Green’s function method is applied to an n+-p thin film polycrystalline solar cell that allows us to calculate the conversion efficiency. This model considers the effective Gaussian doping profile in the p region in order to improve cell efficiency. The dependence of mobility and lifetime on grain doping is also investigated. This model is implemented through a simulation program in order to optimize conversion efficiency while varying thickness and doping profile in the base region of the cell. Compared with back surface field (BSF) technology, our proposed structure shows a 31% improvement in conversion efficiency for a polycrystalline solar cell. For a monocrystalline solar cell, the BSF technology becomes more efficient.
Abstract.A two-dimensional (2D) analytical model based on the Green's Function method is applied to an n + -p thin film polycrystalline solar cell that allows us to calculate the conversion efficiency. This model considers the effective Gaussian doping profile in the p region in order to improve cell efficiency. The dependence of mobility and lifetime on grain doping is also investigated. This model is implemented through a simulation program in order to optimize conversion efficiency while varying thickness and doping profile in the base region of the cell. Compared with n + -p standard structure, our proposed structure shows a 43% improvement in conversion efficiency for a polycrystalline solar cell. PACS. 85.30.De Semiconductor-device, characterization, design and modelling. 88.40.hj Efficiency and performance of solar cells.
In this paper, we present a two-dimensional polycrystalline solar cell model to determine the parameters of the cell, such as the photocurrent, the dark current and the conversion efficiency. In this model, we consider an exponential doping profile of the p-region of the cell and hence the onset of an electric field in this region in order to reduce the minority carrier recombination at grain boundary and at rear contact. Consequently, this improved conversion efficiency of the cell. In order to optimize conversion efficiency, the presented model is implemented through a simulation program while varying thickness and doping concentration in the p-region of the cell. Compared with the case of Dirac's function doping profile, the conversion efficiency is maximal in the case of an exponential doping profile.
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