有机太阳能电池中的电流密度和加热模式:建模和成像实验(会议报告)

R. Oettking, D. Fluhr, R. Rösch, B. Muhsin, H. Hoppe
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引用次数: 0

摘要

为了研究不同几何形状下的电流路径和耗散损耗,我们建立了有机太阳能电池的有限元模型。这些模型是纯电阻性质的,因为这足以描述所考虑的效应。电流的总体行为主要控制器件的电阻行为,并且是单个层属性之间相互作用的微妙结果,即电阻率和层厚度的组合。该模型仅基于外部材料参数进行计算,即不进行拟合,只能得到电流密度、电势和相应电阻损耗的空间分布。特别地,电流路径从顶部触点的整个长度向地触点的整个宽度扩散,沿着电位梯度运行。另一方面,电流拥挤出现在顶部电极的最前面的部分,导致各自的电阻损失集中在这附近。电阻损耗反过来又是热模式的起源,这在DLIT/ILIT实验中是可见的。实验结果与仿真结果的比较显示出显著的一致性。建立了无缺陷太阳能电池的描述,对缺陷进行了仿真。我们利用微二极管模型作为另一种建立的仿真方法来模拟分流或阻塞接触缺陷,并结合电致发光成像方法。用有限元法计算了各自的热模态。各种实验方法和仿真方法之间的一致性很好。然后,各自的热模式允许根据各种成像测量的模式识别几种缺陷,如分流缺陷或阻塞接触缺陷,弥合理论与实验之间的差距,进一步详细分析有机太阳能电池。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Current density and heating patterns in organic solar cells: modelling and imaging experiments (Conference Presentation)
We developed finite element models of organic solar cells in order to investigate current pathways and dissipative losses under different geometries. The models are of purely resistive nature, as this is sufficient to describe the effects under consideration. The overall behaviour of the current mostly steers the resistive behaviour of the device and is a delicate consequence of the interplay between the individual layer properties, namely the resistivities and layer thicknesses in combination. The model calculations solely based on external material parameters, i.e. without fitting, yield the spatial distribution of the current densities, potentials and the according resistive losses. In particular, the current pathways are spread out from the entire length of the top contact towards the entire width of the ground contact, running along the electric potential gradient. On the other hand, current crowding appears at the foremost part of the top electrode, resulting in a respective concentration of the resistive loss in this vicinity. The resistive loss in turn is the origin of the heat pattern, which is visible in DLIT/ILIT experiments. The comparison between experiment and simulation shows remarkable agreement. Having established the description of defect free solar cells, defects were simulated. We utilized the micro-diode-model as another established simulation method to model shunt or blocking contact defects in combination with electro luminescence imaging methods. The respective heat patterns were calculated in FEM. Nice agreement is found between the various experimental and simulation methods. The respective heat patterns then allow identifying several classes of defects such as shunt defects or blocking contact defects in accordance with their patterns from various imaging measurements, bridging the gap between theory and experiment to further the detailed analysis of organic solar cells.
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