Polarization‐type potential‐induced degradation (PID‐p) of photovoltaic (PV) modules composed of n‐type interdigitated back contact (IBC) solar cells can decrease the performance of the PV modules under positive potential conditions. The purpose of this study is to observe and describe the reduction and stabilization of the electrical performance of every PV module installed in an operating PV system with the progress of the PID‐p over a time duration of 6 years. The direct current circuit of the investigated PV system is not grounded. Therefore, all the PV strings are under floating potential conditions. The results show that the performance of the n‐type IBC PV modules exhibits a two‐step degradation. In the first step of degradation, the PV performance at positive potential decreases with increasing the PV module potential, whereas the PV modules at negative potential show little performance degradation. The PV performance reduction due to PID‐p is mainly caused by the decreases in both open‐circuit voltage (V_OC) and short circuit current (I_SC). A PV performance reduction, which principally arises from the decrease in I_SC, is observed at every PV module in the PV strings regardless of the PV module potential in the second step of degradation. Therefore, solar cell manufacturers who produce n‐type IBC, as well as those producing passivated emitters and rear totally diffused solar cells, are advised that processes to prevent the PID‐p are required.

中文翻译：

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在实际运行条件下光伏系统中由叉指背接触式太阳能电池组成的光伏模块的潜在诱发退化

由n型叉指背接触（IBC）太阳能电池组成的光伏（PV）模块的极化型电势诱导降解（PID-p）可能会降低正电势条件下PV模块的性能。这项研究的目的是观察并描述随着PID-p在6年时间内的发展，安装在运行中的光伏系统中每个光伏组件的电气性能的降低和稳定。被研究的光伏系统的直流电路未接地。因此，所有PV串都处于浮动电位条件下。结果表明，n型IBC光伏组件的性能表现为两步下降。在退化的第一步中，正电位下的PV性能会随着PV组件电位的增加而降低，而处于负电位的光伏组件几乎没有性能下降。由于PID‐p而导致的PV性能下降主要是由于两个开路电压（V _OC）和短路电流（I _SC）。无论在退化的第二步中是什么光伏组件电势，在光伏串中的每个光伏组件上都会观察到主要由I _SC降低引起的光伏性能下降。因此，建议生产n型IBC的太阳能电池制造商，以及生产钝化发射极和后方全扩散太阳能电池的制造商，需要采取防止PID-p的工艺。