Evaluation of impedance spectroscopy as a tool to characterize performance losses in silicon photovoltaics

近年来已经开发了新的硅光伏技术，例如PERC（钝化发射极后接触）电池。这些技术出现了新的失效机制，如光和高温诱导降解（LeTID）和钝化层降解。因此，需要新的表征方法来评估制造过程中和现场的这些损失机制。该项目将评估阻抗谱作为一种非破坏性的技术来表征degradationmechanisms和性能损失的硅PERC电池和加拿大太阳能公司制造的模块。阻抗谱（IS）使用具有变化频率的AC信号来测量电系统的阻抗并确定等效电路。等效电路的变化可能与性能损失和电池退化有关。一种非破坏性的技术，以确定具体的degradationmechanisms将补充现有的技术，并将使用加拿大太阳能公司。进一步改进其制造工艺和向客户提供的产品质量。这可能转化为全球市场份额的增加和加拿大就业基础的扩大。重要的是，光能发电是一种环境友好的可再生能源，可以帮助满足加拿大的能源需求。

New silicon photovoltaic technologies have been developed in recent years, such as PERC (Passivated EmitterRear Contact) cells. New failure mechanisms have appeared for these technologies, such as Light and ElevatedTemperature Induced Degradation (LeTID) and passivation layer degradation. New characterization approachesare therefore required to assess these loss mechanisms during the manufacturing process and in the field. Thisproject will assess impedance spectroscopy as a non-destructive technique to characterize degradationmechanisms and performance losses in the silicon PERC cells and modules manufactured by Canadian SolarInc. Impedance spectroscopy (IS) uses an AC signal with varying frequency to measure the impedance of anelectrical system and determine an equivalent circuit. Changes in the equivalent circuit can be associated withperformance losses and cell degradation. A non destructive technique for identifying specific degradationmechanisms would complement existing techniques and would be used by Canadian Solar Inc. to furtherimprove its manufacturing processes and the quality of the products it can deliver to its customers. This couldtranslate to an increased global market share and expanded employment base in Canada. Importantly,photovoltaics are an environmentally friendly renewable energy source that can help meet Canada's energydemands.