Moisture-Induced Crystallographic Reorientations and Effects on Charge Carrier Extraction in Metal Halide Perovskite Solar Cells,ACS Energy Letters

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Moisture-Induced Crystallographic Reorientations and Effects on Charge Carrier Extraction in Metal Halide Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-10-22 , DOI: 10.1021/acsenergylett.0c01964
Juanita Hidalgo ₁ , Carlo A. R. Perini ₁ , Andrés-Felipe Castro-Mendez ₁ , Dennis Jones ₁ , Hans Köbler ₂ , Barry Lai ₃ , Ruipeng Li ₄ , Shijing Sun ₅ , Antonio Abate ₂ , Juan-Pablo Correa-Baena ₁

Affiliation

Lead halide perovskites (LHPs) are promising semiconductors for optoelectronic applications. In LHP solar cells, the focus thus far has been mainly on compositional optimization of the MHP layer, without much understanding of the effects of compositional mixing on structure and texture. This is a serious gap in our knowledge because research has shown that texture underlies the mechanisms of charge carrier and ionic transport. Therefore, it is essential to understand the mechanisms that drive changes in texture in LHPs. This work examines the effect of moisture and composition on the structure and texture of LHPs and their impacts on optoelectronic properties. Exposure to moisture is shown to induce a crystallographic reorientation in the polycrystalline films, which is also dependent on the amount of organic cation material present at the surface. For films with an excess of organic halide, moisture was shown to induce texture in the (001) plane contributing to the enhancement of photocurrents and long-term device stability. This work shows the importance of texture for the electronic properties of LHPs with a special emphasis on charge carrier extraction in optoelectronic devices.

中文翻译：

水分诱导的晶体学取向及其对金属卤化物钙钛矿太阳能电池中载流子提取的影响

卤化钙钛矿（LHPs）是光电子应用中有希望的半导体。迄今为止，在LHP太阳能电池中，焦点主要集中在MHP层的成分优化上，而对成分混合对结构和质地的影响没有太多了解。这是我们所学知识的一个严重缺口，因为研究表明纹理是电荷载流子和离子迁移机制的基础。因此，必须了解驱动LHP结构改变的机制。这项工作研究了水分和组成对LHPs的结构和质地的影响及其对光电性能的影响。暴露于湿气表明在多晶膜中引起晶体学取向，这也取决于存在于表面的有机阳离子材料的量。对于具有过量有机卤化物的薄膜，显示出水分会在（001）平面中引起织构，从而有助于增强光电流和长期器件稳定性。这项工作表明质构对于LHP的电子性能的重要性，特别强调了光电器件中的载流子提取。

更新日期：2020-11-13

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