论文标题
负电容和倒置滞后：钙钛矿太阳能电池中的匹配特征
Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells
论文作者
论文摘要
低频结构域和倒置滞后的负电容是钙钛矿太阳能电池中熟悉的特征，在那里，原点仍在讨论中。在这里，我们使用阻抗光谱来分析在电子选择性层/钙钛矿界面和暴露于不同相对湿度条件的碘化物设备中，在电子选择层/钙钛矿界面和碘化物设备中用锂阳离子处理的甲基铵铅溴化物细胞中的这些反应。使用表面极化模型，我们获得了与所有表现出这两种特征的情况的离子/空位与表面相互作用的动力学相关的时间常数。这些相互作用导致总体重组抗性的降低，从而改变了低频钙钛矿反应，并屈服于循环伏安法的变平。由于这些结果，我们发现负电容和倒滞后导致填充因子和光伏值的下降。
Negative capacitance at the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, where the origin is still under discussion. Here we use Impedance Spectroscopy to analyse these responses in methylammonium lead bromide cells treated with lithium cation at the electron selective layer/perovskite interface and in iodide devices exposed to different relative humidity conditions. Employing the Surface Polarization Model, we obtain a time constant associated to the kinetics of the interaction of ions/vacancies with the surface, τkin, in the range of 10^0 - 10^2 s for all the cases exhibiting both features. These interactions lead to a decrease in the overall recombination resistance, modifying the low-frequency perovskite response and yielding to a flattening of the cyclic voltammetry. As consequence of these results we find that that negative capacitance and inverted hysteresis lead to a decrease in the fill factor and photovoltage values.
