In organic solar cells, bimolecular recombination is a key factor limiting the device performance and creating the need for characterization. Light‐intensity‐dependent short‐circuit current density measurements are a frequently used tool to qualitatively analyze bimolecular recombination in a device. When applying a 0D model, bimolecular recombination is expected to reduce the otherwise linear correlation of the short‐circuit current density J_sc and the light intensity Φ to a sublinear trend. It is shown by numerical simulations that the slope of the J_sc–Φ curve is affected by the recombination mechanism (direct or via traps), the spatial distribution of charge carriers and—in thick solar cells—by space charge effects. Only the combination of these effects allows proper explanation of the different cases, some of which cannot be explained in a simple 0D device model.

中文翻译：

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了解有机太阳能电池短路电流的光强依赖性

在有机太阳能电池中，双分子重组是限制器件性能并产生表征需求的关键因素。光强度相关的短路电流密度测量是定性分析设备中双分子重组的常用工具。当应用0D模型时，双分子重组有望将短路电流密度J _sc和光强度Φ的线性相关性降低到亚线性趋势。数值模拟表明，J _sc的斜率–Φ曲线受重组机制（直接或通过陷阱），电荷载子的空间分布以及在厚太阳能电池中受空间电荷效应的影响。只有这些效果的组合才能正确解释不同的情况，其中某些情况无法在简单的0D设备模型中进行解释。