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A Coadditive Strategy for Blocking Ionic Mobility in Methylammonium‐Free Perovskite Solar Cells and High‐Stability Achievement
Solar RRL ( IF 6.0 ) Pub Date : 2021-03-10 , DOI: 10.1002/solr.202100010
Daming Zheng 1 , Tao Zhu 1 , Thierry Pauporté 1
Affiliation  

Herein, the synthesis of methylammonium‐free and bromide‐free CsxFA1−xPbI3 (FA for formamidinium) perovskite (PVK) photovoltaic layers with intrinsic outstanding properties in terms of crystallinity, defect waiving/passivation, and ionic mobility blocking by using a coadditives approach is described. It consists in mixing two chloride additives in the PVK precursor solution: potassium chloride (KCl) and ammonium chloride (NH4Cl). KCl favors the lead iodide (PbI2) precursor solubilization and results in a purer PVK phase. NH4Cl allows the control of the crystallization growth speed, leading to the formation of large crystal grains and well‐crystallized layers. By the glow‐discharge optical emission spectroscopy (GD‐OES) technique, it is directly visualized that potassium incorporated in the whole film blocks the iodide mobility by defect passivation. Also, the reduction (or suppression) of iodide mobility and the reduction (or suppression) of the J–V curve hysteresis is clearly correlated. It is found that blocking the ionic mobility is insufficient to fully stabilize the halide perovskite material which also requires the crystallization monitoring carried out in parallel by the second additive. It resulted in Cs0.1FA0.9PbI3 cells with a stabilized power conversion efficiency (PCE) of 20.02% and with superior stability.

中文翻译:

阻止无甲基铵钙钛矿太阳能电池离子迁移和高稳定性成就的共存策略

本文中,合成的无甲铵和无溴的Cs x FA 1- x PbI 3(FA为甲ami )钙钛矿(PVK)光伏层在结晶度,缺陷消除/钝化和离子迁移率阻断方面具有内在的卓越性能。描述了使用共添加剂的方法。它包括在PVK前体溶液中混合两种氯化物添加剂:氯化钾(KCl)和氯化铵(NH 4 Cl)。KCl有利于碘化铅(PbI 2)前体的溶解,并导致更纯的PVK相。NH 4Cl可以控制结晶生长速度,从而导致形成大晶粒和结晶良好的层。通过辉光放电发射光谱(GD-OES)技术,可以直接观察到整个薄膜中掺入的钾会通过缺陷钝化而阻止碘化物的迁移。同样,碘化物迁移率的降低(或抑制)与J–V曲线滞后的降低(或抑制)也很明显相关。发现阻碍离子迁移率不足以完全稳定卤化钙钛矿材料,这也需要由第二添加剂并行进行的结晶监测。结果为Cs 0.1 FA 0.9 PbI 3 稳定的功率转换效率(PCE)为20.02%的电池。
更新日期:2021-05-05
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