Simulation is essential for a comprehensive analysis of the performance of solar cells. The rear contact pitch of passivated emitter and rear cells (PERC cells) is a crucial device parameter that influences not only the electrical performance but also the optical performance of these cells. This article investigates the applicability of the analytical light trapping model by Basore to account for the optical influence of the rear contact pitch as a simpler alternative to ray tracing. First, we manufacture three different groups of cells with different rear contact pitches, where the metallization fraction f _met varies between 0 and 54%. Second, the reflectance of the cells is measured. Subsequently, we fit the model parameters R _f and R _b (internal reflection on the front and back surface, respectively) to the measured reflectance. While we confirm a nonlinear relation between f _met and the measurable spectra found in previous works, our results reveal linear relations between f _met and R _b with the adjusted coefficients of determination of R _adj ² > 0.97, as well as between f _met and the charge carrier generation rates with R _adj ² > 0.94. These relations allow a simple and rapid optical simulation of f _met variation for PERC cells. The same approach is likely applicable to any local contacts also in other cell concepts.

中文翻译：

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PERC 太阳能电池的背面反射参数化，包括背面接触覆盖的变化

仿真对于太阳能电池性能的综合分析至关重要。钝化发射极和背面电池（PERC 电池）的背面触点间距是一个关键的器件参数，它不仅影响这些电池的电气性能，还影响这些电池的光学性能。本文研究了 Basore 的分析光捕获模型的适用性，以解释作为光线追踪的更简单替代方法的后接触节距的光学影响。首先，我们制造了三组具有不同后接触节距的电池，其中金属化率f _met在 0 到 54% 之间变化。其次，测量细胞的反射率。随后，我们拟合模型参数R _f和R _b（分别在正面和背面的内反射）到测量的反射率。虽然我们确认了之间的非线性关系f _满足和以前工作中发现的可测量光谱，我们的结果揭示了之间的线性关系f _遇到和R _b与调整后的决定系数R _adj ² > 0.97，以及介于f _满足和电荷载流子生成率R _adj ² > 0.94。这些关系允许简单快速的光学模拟f _满足PERC 电池的变化。同样的方法可能适用于其他小区概念中的任何本地联系人。