当前位置: X-MOL 学术ACS Nano › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Predictive Modeling of Ion Migration Induced Degradation in Perovskite Solar Cells
ACS Nano ( IF 15.8 ) Pub Date : 2017-11-09 00:00:00 , DOI: 10.1021/acsnano.7b06294
Vikas Nandal 1 , Pradeep R. Nair 1
Affiliation  

With excellent efficiencies being reported from multiple laboratories across the world, device stability and the degradation mechanisms have emerged as the key aspects that could determine the future prospects of perovskite solar cells. However, the related experimental efforts remain scattered due to the lack of any unifying theoretical framework. In this context, here we provide a comprehensive analysis of ion migration effects in perovskite solar cells. Specifically, we show that (a) the effect of ionic charges is almost indistinguishable from that of dopant ions, (b) ion migration could lead to simultaneous improvement in Voc and degradation in Jsc—an observation which is beyond the realm of mere parametric variation in carrier mobility and lifetime, (c) champion devices are more resilient toward the ill effects of ion migration; (d) we propose characterization schemes to determine both magnitude and polarity of ionic species, and finally, (e) we illustrate that ion migration could be differentiated from ion redistribution based on the distinct trends in performance degradation. Our results, supported by detailed numerical simulations and direct comparison with experimental data, are of broad interest and provide a much needed predictive capability toward the research on performance degradation mechanisms in perovskite solar cells.

中文翻译:

钙钛矿型太阳能电池中离子迁移引起的降解的预测模型

全世界多个实验室都报告了出色的效率,因此器件稳定性和降解机理已成为决定钙钛矿太阳能电池未来前景的关键方面。但是,由于缺乏统一的理论框架,相关的实验工作仍然分散。在这种情况下,我们在此提供了钙钛矿型太阳能电池中离子迁移效应的综合分析。具体而言,我们表明(a)离子电荷的影响与掺杂离子几乎没有区别,(b)离子迁移可同时导致V oc的改善和J sc的降解—载流子迁移率和寿命仅有参数变化的境界之外的观察结果;(c)冠军设备对离子迁移的不良影响更具弹性;(d)我们提出了表征方案,以确定离子种类的大小和极性,最后,(e)我们说明了基于性能下降的明显趋势,可以将离子迁移与离子再分布区分开。我们的研究结果得到详细的数值模拟以及与实验数据的直接比较的支持,引起了广泛的兴趣,并为钙钛矿型太阳能电池性能下降机理的研究提供了非常需要的预测能力。
更新日期:2017-11-09
down
wechat
bug