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首页> 外文期刊>Organic Electronics >Crystallization and grain growth regulation through Lewis acid-base adduct formation in hot cast perovskite-based solar cells
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Crystallization and grain growth regulation through Lewis acid-base adduct formation in hot cast perovskite-based solar cells

机译：热铸钙钛矿基太阳能电池中通过路易斯酸碱加成物形成的结晶和晶粒生长调节

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The precise control of perovskite crystallization process that could provide smooth films with large grains is a prerequisite for solar cell fabrication to achieve higher efficiencies. To regulate this crystallization process and to achieve it multiple times remains a humongous challenge. This process has been reproducibly demonstrated here through efficient molecular exchange via a Lewis acid-base adduct formation. In this work, a Lewis acid-base adduct approach in concurrence with hot casting technique was employed to efficiently control the perovskite crystallization by judiciously adding dimethyl sulfoxide (DMSO) to a precursor solution of lead iodide (PbI2) and methyl ammonium chloride (MACl) in dimethylformamide (DMF). High quality perovskite films were fabricated by precisely controlling the volume of DMSO which resulted in low recombination rate and which had better light harvesting ability. Uniform films of MAPbCl(x)I(3-x) having large grain size were formed reproducibly on addition of 1.5 equivalents (eq.) DMSO to the precursor solution. Perovskite solar cells fabricated using this solution resulted in maximum power conversion efficiency (PCE) of 14.11% with enhanced stability as compared to the reduced PCE values obtained with other DMSO ratios and pure DMF solution cast films.
机译：钙钛矿结晶过程的精确控制可以提供具有大晶粒的光滑膜，这是太阳能电池制造获得更高效率的先决条件。调节结晶过程并实现多次结晶仍然是一项艰巨的挑战。此过程已通过路易斯酸碱加合物的形成进行了有效的分子交换，在此可重现。在这项工作中，与热浇铸技术同时使用路易斯酸碱加合物方法，是通过将二甲基亚砜（DMSO）明智地添加到碘化铅（PbI2）和甲基氯化铵（MACl）的前体溶液中来有效控制钙钛矿的结晶。在二甲基甲酰胺（DMF）中。通过精确控制DMSO的体积可以制备高质量的钙钛矿薄膜，从而降低了复合率，并且具有更好的光收集能力。通过向前体溶液中添加1.5当量（eq。）DMSO，可再现地形成具有大晶粒尺寸的MAPbCl（x）I（3-x）均匀膜。与使用其他DMSO比例和纯DMF溶液流延膜获得的降低的PCE值相比，使用该解决方案制造的钙钛矿太阳能电池可实现14.11％的最大功率转换效率（PCE），并具有增强的稳定性。

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