Ultrasonic Spray Deposition of a Passivating Agent for Spray-Coated, Methylammonium-Free Perovskite Solar Cells
Ultrasonic Spray Deposition of a Passivating Agent for Spray-Coated, Methylammonium-Free Perovskite Solar Cells
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用于喷涂无甲基铵钙钛矿太阳能电池的钝化剂的超声波喷涂沉积
DOI：
10.1002/solr.202300814
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发表时间：
2023
期刊：
影响因子：
7.9
通讯作者：
Cassella E
中科院分区：
文献类型：
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作者：
Cassella E
通过表面钝化进行的钙钛矿太阳能电池（PSC）缺陷管理已成为通过降低缺陷密度和/或改善钙钛矿与电荷传输层之间的能量对准来最大化器件稳定性和太阳能到电能转换效率（PCE）的基石。尽管如此，很少有报告探索使用卷对卷兼容技术来沉积此类界面处理，从而限制了钝化在现实世界中的适用性。在这项工作中，将异丁基溴化铵（i-BABr）喷涂到使用气体辅助超声波喷涂沉积的 Cs0.15FA0.85PbI2.85Cl0.15 钙钛矿表面上。研究发现 i-BABr 处理会导致准二维钙钛矿层的形成。与未经处理的器件相比，喷涂表面处理使中值开路电压显着提高了 80 mV。重要的是，喷涂钝化与旋涂处理的应用产生了非常相似的积极效益，证明了喷涂钝化方法的前景。结果表明，以这种方式创建的器件的 PCE 高达 21.0%（19.4% 稳定），代表了单步喷涂不含甲基铵 PSC 的最高效率。这项工作首次展示了与高通量、卷对卷加工兼容的喷涂表面钝化处理。
Defect management in perovskite solar cells (PSCs) via surface passivation has become a cornerstone in maximizing both stability and solar‐to‐electrical power conversion efficiency (PCE) of devices by reducing defect densities and/or improving energetic alignment between the perovskite and charge‐transporting layers. Despite this, few reports explore the use of roll‐to‐roll compatible technologies to deposit such interfacial treatments, limiting the applicability of passivation in real‐world contexts. In this work, iso‐butylammonium bromide (i‐BABr) is spray‐coated onto a Cs0.15FA0.85PbI2.85Cl0.15perovskite surface which is deposited using gas‐assisted ultrasonic spray coating. It is found that i‐BABr treatments result in the formation of a quasi‐2D perovskite layer. The spray‐coated surface treatment results in an impressive 80 mV improvement in the median open‐circuit voltage with respect to untreated devices. Importantly, the spray‐coated passivation results in very similar positive benefits to the application of spin‐coated treatments demonstrating the promise of the spray‐passivation methodology. It is shown that devices created in this manner demonstrate PCEs of up to 21.0% (19.4% stabilized), representing the highest reported efficiency for one‐step, spray‐coated methylammonium‐free PSCs. This work represents the first demonstration of a spray‐coated surface passivation treatment that is compatible with high‐throughput, roll‐to‐roll processing.