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首页> 外文期刊>Advanced energy materials >Controllable Perovskite Crystallization via Antisolvent Technique Using Chloride Additives for Highly Efficient Planar Perovskite Solar Cells
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Controllable Perovskite Crystallization via Antisolvent Technique Using Chloride Additives for Highly Efficient Planar Perovskite Solar Cells

机译：通过使用氯化物添加剂的高效液相钙钛矿太阳能电池通过反溶剂技术可控的钙钛矿结晶

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摘要

The presence of surface and grain boundary defects in organic-inorganic halide perovskite films can be detrimental to both the performance and operational stability of perovskite solar cells (PSCs). Here, the effect of chloride additives is studied on the bulk and surface defects of the mixed cation and halide PSCs. It is found that using an antisolvent technique, the perovskite film is divided into two layers, i.e., a bottom layer with large grains and a thin capping layer with small grains. The addition of formamidinium chloride (FACl) into the precursor solution removes the small-grained perovskite capping layer and suppresses the formation of bulk and surface defects, providing a perovskite film with enhanced crystallinity and large grain size of over 1 mu m. Time-resolved photoluminescence measurements show longer lifetimes for perovskite films modified by FACl and subsequently passivated by 1-adamantylamine hydrochloride as compared to the reference sample. Impedance spectroscopy measurements show that these treatments reduce the recombination in the PSCs, leading to a champion device with power conversion efficiency (PCE) of 21.2%, an open circuit voltage of 1152 mV and negligible hysteresis. The Cl treated PSC also shows improved operational stability with only 12% PCE loss after 700 h under continuous illumination.
机译：有机-无机卤化物钙钛矿薄膜中表面和晶界缺陷的存在可能不利于钙钛矿太阳能电池（PSC）的性能和操作稳定性。在这里，研究了氯化物添加剂对混合阳离子和卤化物PSC的体积和表面缺陷的影响。发现使用抗溶剂技术，将钙钛矿膜分为两层，即，具有大晶粒的底层和具有小晶粒的薄覆盖层。在前体溶液中添加甲酰氯氯化铵（FACl）可以去除小颗粒的钙钛矿覆盖层并抑制形成大块和表面缺陷，从而提供具有增强的结晶度和超过1微米的大晶粒尺寸的钙钛矿膜。时间分辨的光致发光测量结果显示，与参比样品相比，经FAC1改性并随后被1-金刚烷基胺盐酸盐钝化的钙钛矿膜的寿命更长。阻抗谱测量表明，这些处理减少了PSC中的重组，从而导致了具有21.2％的功率转换效率（PCE），1152 mV的开路电压和可忽略的磁滞的冠军设备。经Cl处理的PSC还显示出改善的操作稳定性，在连续照明下700小时后，PCE损失仅为12％。

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