On Charge Carrier Density in Organic Solar Cells Obtained via Capacitance Spectroscopy,Advanced Electronic Materials

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On Charge Carrier Density in Organic Solar Cells Obtained via Capacitance Spectroscopy
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-09-11 , DOI: 10.1002/aelm.202000517
Joachim Vollbrecht ₁ , Viktor V. Brus ₂

Affiliation

The determination of the voltage‐dependent density of free charge carriers via capacitance spectroscopy is considered an important step in the analysis of emerging photovoltaic technologies, such as organic and perovskite solar cells. In particular, an intimate knowledge of the density of free charge carriers is required for the determination of crucial parameters such as the effective mobility, charge carrier lifetime, nongeminate recombination coefficients, average extraction times, and competition factors. Hence, it is paramount to verify the validity of the commonly employed approaches to obtain the density of free charge carriers. The advantages, drawbacks, and limitations of the most common approaches are investigated in detail and strategies to mitigate misleading values are explored. To this end, two types of nonfullerene organic solar cells based on a PTB7‐Th:ITIC‐2F blend and a PM6:Y6 blend, respectively, are used as a case study to assess how subsequent analyses of the nongeminate recombination dynamics depend on the chosen approach to calculate the density of free charge carriers via capacitance spectroscopy.

中文翻译：

电容光谱法研究有机太阳能电池中的载流子密度

通过电容光谱法确定自由电荷载流子的电压相关密度被认为是分析新兴光伏技术（例如有机和钙钛矿太阳能电池）的重要步骤。特别是，对于确定关键参数（例如有效迁移率，电荷载流子寿命，非对位重组系数，平均提取时间和竞争因子），需要了解自由电荷载流子的密度。因此，至关重要的是要验证常用方法获得自由载流子密度的有效性。详细研究了最常见方法的优点，缺点和局限性，并探讨了减少误导性价值的策略。为此，

更新日期：2020-10-11

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