Abstract Sheet resistance losses and local defects are challenges faced in solar module fabrication and upscaling processes. Commonly used investigation tools are non-invasive optical and thermal imaging techniques, such as electroluminescence, photoluminescence as well as illuminated and dark infrared imaging. Here, we investigate the potential of computationally efficient finite element simulation of solar cells and modules by considering planar electrodes coupled by a local current–voltage coupling law. Sheet resistances are determined by fitting current simulation results of an OPV solar cell to electroluminescence imaging data. Moreover, a thermal model is introduced that accounts for Joule heating due to an electrothermal coupling. A direct comparison of simulated temperature maps to measured infrared images is therefore possible. The electrothermal model is successfully validated by comparing measured and simulated temperature profiles across four interconnected organic solar cells of a mini-module. Furthermore, the influence of shunts on the thermal behavior of OPV modules is investigated by comparing electrothermal simulation results to dark lock-In IR thermography images.

中文翻译：

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用于分析薄膜太阳能电池的电致发光和红外图像的有限元建模

摘要 薄层电阻损失和局部缺陷是太阳能模块制造和升级过程中面临的挑战。常用的调查工具是非侵入性光学和热成像技术，例如电致发光、光致发光以及照明和暗红外成像。在这里，我们通过考虑由局部电流 - 电压耦合定律耦合的平面电极来研究太阳能电池和模块的计算效率有限元模拟的潜力。通过将 OPV 太阳能电池的电流模拟结果与电致发光成像数据拟合来确定薄层电阻。此外，还引入了一个热模型，该模型解释了由于电热耦合引起的焦耳热。因此，可以将模拟温度图与测量的红外图像进行直接比较。通过比较微型模块的四个相互连接的有机太阳能电池的测量和模拟温度曲线，成功地验证了电热模型。此外，通过将电热模拟结果与暗锁定红外热成像图像进行比较，研究了分流器对 OPV 模块热行为的影响。