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Mitigation of Vacuum and Illumination-Induced Degradation in Perovskite Solar Cells by Structure Engineering
Joule ( IF 38.6 ) Pub Date : 2020-04-24 , DOI: 10.1016/j.joule.2020.03.017
Yan Jiang , Shih-Chi Yang , Quentin Jeangros , Stefano Pisoni , Thierry Moser , Stephan Buecheler , Ayodhya N. Tiwari , Fan Fu

High specific power, high stowed packing efficiency, low processing cost, and high tolerance against environmental threats (high energy and charged particle radiation) make perovskite solar cell (PSC) a promising candidate for power generation in space. However, vacuum, as encountered in space, causes perovskite outgassing, raising concern for its long-term stability. In this work, we find that PSCs (ITO/SnO2/perovskite/Spiro-MeOTAD/Au) degrade ten times faster upon reducing the pressure from 9 × 104 to 5 × 103 Pa during operation, due to acceleration of the perovskite transformation and ion migration. Gas permeability of the layers atop perovskite and mobile ion-induced chemical reactions at charge transporting layers and related interfaces are two critical factors. We develop a PSC structure (ITO/PTAA/perovskite/PCBM/ZnO/AZO/[Ni/Al grid]) that effectively mitigates vacuum and illumination-induced degradation pathways, enabling PSCs to realize a low PCE loss rate of 0.007%/h over 1,037 h at the maximum power point under 100 mW cm−2 illumination at 5 × 103 Pa.



中文翻译:

通过结构工程减轻钙钛矿太阳能电池中真空和照明引起的降解

钙钛矿太阳能电池(PSC)具有高的比功率,高的积载包装效率,低的处理成本以及对环境威胁(高能量和带电粒子辐射)的高耐受性,是空间发电的有希望的候选者。然而,在太空中遇到的真空会导致钙钛矿除气,引起对其长期稳定性的关注。在这项工作中,我们发现将压力从9×10 4降低到5×10 3时,PSC(ITO / SnO 2 /钙钛矿/ Spiro-MeOTAD / Au)降解速度快十倍。在操作过程中,由于钙钛矿转化的加速和离子迁移,Pa增大。钙钛矿之上的层的气体渗透性以及在电荷传输层和相关界面处的离子移动引起的化学反应是两个关键因素。我们开发了一种PSC结构(ITO / PTAA /钙钛矿/ PCBM / ZnO / AZO / [Ni / Al网格]),可有效缓解真空和光照引起的降解途径,使PSC能够实现0.007%/ h的低PCE损失率在5×10 3 Pa的100 mW cm -2照度下,最大功率点超过1,037 h 。

更新日期:2020-04-24
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