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Illumination Intensity Dependence of the Recombination Mechanism in Mixed Perovskite Solar Cells
ChemPlusChem ( IF 3.0 ) Pub Date : 2021-08-31 , DOI: 10.1002/cplu.202100233 Alejandra Castro-Chong 1 , Antonio J Riquelme 2 , Tom Aernouts 3 , Laurence J Bennett 4 , Giles Richardson 4 , Gerko Oskam 1, 2 , Juan A Anta 2
ChemPlusChem ( IF 3.0 ) Pub Date : 2021-08-31 , DOI: 10.1002/cplu.202100233 Alejandra Castro-Chong 1 , Antonio J Riquelme 2 , Tom Aernouts 3 , Laurence J Bennett 4 , Giles Richardson 4 , Gerko Oskam 1, 2 , Juan A Anta 2
Affiliation
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Recombination mechanisms in solar cells are frequently assessed through the determination of ideality factors. In this work we report an abrupt change of the value of the “apparent” ideality factor (nAP) in high-efficiency FA0.71MA0.29PbI2.9Br0.1 based mesoscopic perovskite solar cells as a function of light intensity. This change is manifested as a transition from a regime characterized by nAP∼1.8–2.5 at low light intensities (<10 mWcm-2) to one characterized by nAP∼1. This transition is equally observed in the recombination resistance extracted from open-circuit impedance measurements. We use drift-diffusion simulations with explicit consideration of ion migration to determine the origin of this transition. We find that a change ofrecombination mechanism concurrent with a modification of the concentration of ionic vacancies is the most likely explanation of the observed behaviour. In the drift-diffusion simulations we show that the apparent ideality factor is in fact affected by the ion vacancy concentration so it is not the optimal parameter to assess the dominant recombination mechanism. We argue that a procedure based on a recently derived “electronic” ideality factor obtained from the high frequency feature of the impedance spectrum is better suited to determine the recombination route that dictates the photovoltage.
中文翻译：
混合钙钛矿太阳能电池复合机制的光照强度依赖性
太阳能电池中的复合机制经常通过确定理想因子来评估。在这项工作中，我们报告了高效 FA 0.71 MA 0.29 PbI 2.9 Br 0.1基介观钙钛矿太阳能电池中“表观”理想因子 ( n AP ) 值随光强度的突然变化。这种变化表现为从低光强度（<10 id=16>-2）下以n AP ∼1.8–2.5 为特征的状态到以n AP ∼1 为特征的状态的转变。在从开路阻抗测量中提取的复合电阻中同样可以观察到这种转变。我们使用漂移扩散模拟并明确考虑离子迁移来确定这种转变的起源。我们发现重组机制的变化与离子空位浓度的改变同时发生是对所观察到的行为最可能的解释。在漂移扩散模拟中，我们表明表观理想因子实际上受到离子空位浓度的影响，因此它不是评估主要复合机制的最佳参数。我们认为，基于最近从阻抗谱的高频特征获得的“电子”理想因子的程序更适合确定决定光电压的复合路径。
更新日期：2021-09-23
中文翻译：
混合钙钛矿太阳能电池复合机制的光照强度依赖性
太阳能电池中的复合机制经常通过确定理想因子来评估。在这项工作中，我们报告了高效 FA 0.71 MA 0.29 PbI 2.9 Br 0.1基介观钙钛矿太阳能电池中“表观”理想因子 ( n AP ) 值随光强度的突然变化。这种变化表现为从低光强度（<10 id=16>-2）下以n AP ∼1.8–2.5 为特征的状态到以n AP ∼1 为特征的状态的转变。在从开路阻抗测量中提取的复合电阻中同样可以观察到这种转变。我们使用漂移扩散模拟并明确考虑离子迁移来确定这种转变的起源。我们发现重组机制的变化与离子空位浓度的改变同时发生是对所观察到的行为最可能的解释。在漂移扩散模拟中，我们表明表观理想因子实际上受到离子空位浓度的影响，因此它不是评估主要复合机制的最佳参数。我们认为，基于最近从阻抗谱的高频特征获得的“电子”理想因子的程序更适合确定决定光电压的复合路径。
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