Strain engineering in metal halide perovskite materials and devices: Influence on stability and optoelectronic properties
Strain engineering in metal halide perovskite materials and devices: Influence on stability and optoelectronic properties
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DOI：
10.1063/5.0044588
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发表时间：
2021-07
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影响因子：
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通讯作者：
Mengru Wang;Zhenyi Ni;Xun Xiao;Ying Zhou;Jinsong Huang
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文献类型：
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作者：
Mengru Wang;Zhenyi Ni;Xun Xiao;Ying Zhou;Jinsong Huang
金属卤化物钙钛矿（MHP）由于其优异的光电性能、低成本和易于通过多种工艺制备而在太阳能电池和其他器件中具有广阔的应用前景而被广泛研究。与从溶液中生长的块状晶体不同，沉积在衬底上的多晶钙钛矿薄膜通常由于多种机制而产生应变，这显著影响其光电特性、缺陷物理学和光稳定性。钙钛矿太阳能电池板的制造和操作不可避免地在钙钛矿中引入应变。应变已被广泛地应用于稳定几种钙钛矿组合物的光活性相，否则这些钙钛矿组合物将在室温下显示化学稳定的光非活性相。为了提高器件性能，对MHP的应变工程进行了越来越多的研究。然而，在MHP的应变工程仍然缺乏系统的审查和理解。本文综述了MHP材料和太阳能电池的应变工程。在这篇综述中，我们首先对半导体中的应变进行了综述，包括应变的特性、表征技术以及应变对半导体的晶格结构、电子和光学性质的影响。然后，我们总结了在理解应变的产生分类的本地和全球的应变及其对多方面的性能的MHP的影响，包括相位稳定性，光稳定性，和其他光电性能的进展。对这些特性的影响既有积极的也有消极的。应变工程已被证明在制造更高效和更稳定的钙钛矿太阳能电池方面有希望。
Metal halide perovskites (MHPs) have been extensively studied for their promising applications in solar cells and other devices due to their extraordinary optoelectronic properties, low cost, and easy fabrication by versatile processes. Different from bulk crystals grown from solutions, polycrystalline perovskite films deposited on substrates generally are strained due to multiple mechanisms, which significantly impact their optoelectronic properties, defect physics, and photostability. The fabrication and operation of perovskite solar panels inevitably introduce strains in perovskite. Strain has been broadly applied to stabilize the photoactive phase of several perovskite compositions that would otherwise show a thermodynamically stable photoinactive phase at room temperature. There is increasing research on strain engineering of MHPs to enhance device performance. However, a systematic review and understanding of strain engineering in MHP is still lacking. Herein, an overview of strain engineering on MHP materials and solar cells is provided. In this review, we start with a general review on strain in semiconductors, including the characteristics of strain, characterization techniques, and the effects of strain on the lattice structure, electronic, and optical properties of semiconductors. We then summarize progress in understanding the generation of strain categorized by local and global strains and their impacts on the multi-faceted properties of MHPs, including phase stability, photostability, and other optoelectronic properties. Both positive and negative impacts have been observed on these properties. Strain engineering has shown to be promising in making much more efficient and stable perovskite solar cells.