负电容和反相迟滞：超导太阳能电池的匹配特性
Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells
摘要：
低频域的负电容和反向滞后是钙钛矿太阳能电池中常见的特征，其中起源仍在讨论中。在这里，我们使用阻抗谱分析这些响应在甲基铵溴化铅电池处理锂阳离子在电子选择性层/钙钛矿界面和碘化物设备暴露于不同的相对湿度条件。采用表面极化模型，我们得到了与离子/空位与表面相互作用动力学相关的时间常数τkin，对于所有表现出这两种特征的情况，其范围为10^0 - 10^2 s。这些相互作用导致整体复合电阻的降低，修改低频钙钛矿响应并产生循环伏安法的平坦化。作为这些结果，我们发现负电容和反相滞后导致填充因子和光电压值下降。
英文摘要：
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.
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