Sn Perovskite Solar Cells via 2D/3D Bilayer Formation through a Sequential Vapor Process,ACS Energy Letters

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Sn Perovskite Solar Cells via 2D/3D Bilayer Formation through a Sequential Vapor Process
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsenergylett.0c01887
Won-Gyu Choi ₁ , Chan-Gyu Park ₁ , Yongmin Kim ₂ , Taeho Moon ₁

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Sn-based perovskite solar cells are attracting great attention because of their potential for efficiency enhancement and their relative eco-friendliness compared with Pb-based perovskite solar cells. The main challenges lie in improving the oxidation stability and ensuring a uniform morphology of the Sn-based perovskite films. Here, we introduce a bilayer structure of 2D PEA₂SnI₄ and 3D MASnI₃ perovskite (PEA = phenethylammonium; MA = methylammonium) formed by a sequential vapor process that combines vacuum deposition and vapor reaction. The vapor process ensures that the perovskite thin films are uniform and enables the fabrication of an upper layer with fine thickness control without damaging the lower layer. With the introduction of the 2D layer, Sn oxidation is suppressed and the crystallinity of the 3D layer is enhanced. A planar-type solar cell fabricated using the optimized 2D/3D structure exhibits an average efficiency of 9.2 ± 0.2%.

中文翻译：

锡钙钛矿太阳能电池通过顺序蒸汽过程通过2D / 3D双层形成

与基于铅的钙钛矿太阳能电池相比，基于锡的钙钛矿太阳能电池具有提高效率的潜力和相对的生态友好性，因此备受关注。主要挑战在于提高氧化稳定性并确保Sn基钙钛矿薄膜的形态均匀。在这里，我们介绍2D PEA ₂ SnI ₄和3D MASnI ₃的双层结构钙钛矿（PEA =苯乙铵； MA =甲基铵），是通过将真空沉积和气相反应相结合的顺序气相法形成的。蒸气法确保钙钛矿薄膜均匀，并能够在不损坏下层的情况下制造具有精细厚度控制的上层。通过引入2D层，抑制了Sn氧化，并且增强了3D层的结晶度。使用优化的2D / 3D结构制造的平面型太阳能电池的平均效率为9.2±0.2％。

更新日期：2020-11-13

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