Understanding and monitoring the capacitance‐voltage technique for the characterization of tandem solar cells,Progress in Photovoltaics

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Understanding and monitoring the capacitance‐voltage technique for the characterization of tandem solar cells
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2020-01-13 , DOI: 10.1002/pip.3235
Cyril Leon ₁ , Sylvain Le Gall ₁ , Marie‐Estelle Gueunier‐Farret ₁ , Aurore Brézard‐Oudot ₁ , Alexandre Jaffre ₁ , Nicolas Moron ₁ , Laura Vauche ₂ , Karim Medjoubi ₂ , Elias Veinberg Vidal ₂ , Christophe Longeaud ₁ , Jean‐Paul Kleider ₁

Affiliation

This paper presents a simple and nondestructive method to determine doping densities and built‐in potential of subcells by adapting the well‐known capacitance‐voltage (C‐V) technique to two‐terminal (2 T) tandem solar cells. Because of the electrical coupling between the two subcells in a monolithic 2 T tandem solar cell, the standard method using a Mott‐Schottky plot (1/C² vs V) cannot be applied. Using numerical modeling, it is demonstrated that, by under chosen illumination conditions where only one subcell can absorb the light, it is possible to explore the bias dependence of the capacitance and to extract the parameters of the other subcell if the appropriate frequency conditions are present. This method is experimentally applied to an AlGaAs/Si tandem cell, and parameters of both AlGaAs and Si cells are extracted. Finally, the validity of that method is assessed by the very good agreement obtained when comparing the values extracted from our measurements on the tandem cell to those extracted from measurements on isotype cells and to the values targeted during the fabrication process of the AlGaAs/Si tandem solar cell.

中文翻译：

了解和监测用于串联太阳能电池表征的电容电压技术

本文提出了一种简单而无损的方法，通过将著名的电容电压（C ‐ V）技术应用于两端（2 T）串联太阳能电池来确定子电池的掺杂密度和内在电势。由于单片2 T串联太阳能电池中两个子电池之间的电耦合，因此使用莫特-肖特基图的标准方法（1 / C ² vs V）无法应用。使用数值模型证明，通过在只有一个子电池可以吸收光的选定照明条件下，如果存在适当的频率条件，就有可能探索电容的偏置依赖性并提取其他子电池的参数。。该方法在实验上应用于AlGaAs / Si串联电池，并提取了AlGaAs和Si电池的参数。最后，通过比较从我们在串联电池上的测量结果中提取的值与在同型电池上的测量结果中提取的值以及在AlGaAs / Si串联制造过程中目标值之间的比较，所获得的良好一致性评估了该方法的有效性。太阳能电池。

更新日期：2020-01-13

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