Title: Evolution of performance parameters of perovskite solar cells with current-voltage scan frequency Show Chinese title

Title: 钙钛矿太阳能电池性能参数随电流-电压扫描频率的演变

Abstract: Current-voltage measurements are a standard testing protocol to determine the efficiency of any solar cell. However, perovskite solar cells display significant kinetic phenomena that modify the performance at several time scales, due to hysteresis, internal capacitances, and related mechanisms. Here, we develop a method to analyze the current-voltage curves by using large amplitude sinusoids as the excitation waveforms, specifically addressed to determine the influence of cycling frequency on the performance parameters. We solve a system of equations representative of charge collection and recombination, that provide the frequency-dependent dynamical behavior of the internal ion-controlled surface recombination processes that cause open-circuit voltage variations often observed in high performance devices. We analyze several reported experimental data, and we feature the key parameters governing the evolution of hysteresis phenomena as the scan speed is increased in relation to Impedance Spectroscopy. Show Chinese abstract

Abstract: 电流-电压测量是一种标准的测试协议，用于确定任何太阳能电池的效率。 然而，钙钛矿太阳能电池表现出显著的动力学现象，这些现象由于滞后效应、内部电容及相关机制，在多个时间尺度上改变了性能。 在这里，我们开发了一种方法，通过使用大振幅正弦波作为激励波形来分析电流-电压曲线，特别针对确定循环频率对性能参数的影响。 我们求解了一个代表电荷收集和复合的方程组，该方程组提供了内部离子控制的表面复合过程的频率依赖性动态行为，这些过程导致了在高性能器件中经常观察到的开路电压变化。 我们分析了几项已报道的实验数据，并强调了在扫描速度增加时，与阻抗谱相关的滞后现象演化的关键参数。