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The dominant role of memory-based capacitive hysteretic currents in operation of photovoltaic perovskites
Nano Energy ( IF 16.602 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.nanoen.2020.105398
Enrique Hernández-Balaguera, Beatriz Romero, Belén Arredondo, Gonzalo del Pozo, Mehrdad Najafi, Yulia Galagan

The potential opportunities of perovskite-based technology to further advance in the photovoltaic field and implement an extensive industrial application, will mainly depend on whether some of its weaknesses, such as current density-voltage (JV) hysteresis, can be overcome. In this sense, a critical aspect is the understanding and the subsequent accurate description of hysteresis in perovskite cells. Here, we present the theoretical underpinnings to interpret non-ideal transient dynamics in stepwise-JV measurements, using electrical analysis strategies and fractional calculus tools. Our model was validated with experimental measurements of CsFAPbIBr-based photovoltaic perovskites of different active layer thicknesses with persistent long-range time photocurrents. It is reported that hysteresis phenomena increase with more pronounced non-ideal capacitive effects suggesting that more trapping events limit ion motion and carrier transport. Our main interest is to provide valuable information about the memory-based slow timescale dynamics, which exhibits a significant impact on the appearance of hysteresis and, to a large extent, on the operation of the solar cell.



中文翻译:

基于记忆的电容性磁滞电流在光伏钙钛矿运行中的主导作用

基于钙钛矿的技术在光伏领域进一步发展并实现广泛的工业应用的潜在机会,将主要取决于能否克服其某些弱点,例如电流密度-电压(J - V)滞后现象。从这个意义上讲,一个关键方面是钙钛矿细胞中磁滞现象的理解和随后的准确描述。在这里,我们提供理论基础来解释逐步合营中的非理想瞬态动力学使用电分析策略和分数演算工具进行测量。我们的模型通过对具有不同长效时间光电流的不同活性层厚度的基于CsFAPbIBr的光伏钙钛矿进行实验测量得到了验证。据报道,磁滞现象随着更明显的非理想电容效应而增加,这表明更多的俘获事件限制了离子运动和载流子传输。我们的主要兴趣是提供有关基于内存的慢速时标动力学的有价值的信息,这对磁滞现象的出现以及在很大程度上对太阳能电池的运行都具有重大影响。

更新日期:2020-09-18
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