Large-Area, Highly Uniform Evaporated Formamidinium Lead Triiodide Thin Films for Solar Cells
Large-Area, Highly Uniform Evaporated Formamidinium Lead Triiodide Thin Films for Solar Cells
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DOI：
10.1021/acsenergylett.7b00967
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发表时间：
2017-12-01
影响因子：
22
通讯作者：
Johnston, Michael B.
中科院分区：
文献类型：
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作者：
Borchert, Juliane;Milot, Rebecca L.;Johnston, Michael B.
Percent薄膜太阳能电池是最有前途的新兴可再生能源技术之一，因为它们具有低成本，大面积制造的潜力以及高能量转换效率。最近，甲脒鎓三碘化铅（FAPbI（3））和其他甲脒鎓（CH（NH 2）（2））基钙钛矿已被探索作为甲基铵三碘化铅（MAPbI（3））的令人感兴趣的替代物，因为它们表现出更好的热稳定性。然而，目前的一个主要挑战是将钙钛矿太阳能电池从小型测试电池扩大到完整的太阳能模块。我们表明，共蒸发是一种可扩展的方法，用于在大面积上沉积均匀的FAPbI 3薄膜。该方法允许精确控制薄膜厚度，并产生高度均匀、无针孔的层。我们的薄膜显示出26 cm（2）V-1 s（-1）的高载流子迁移率，优异的光学性能，和7 × 10（-11）cm（3）s（-1）的双分子复合常数。在常规器件架构中使用这些气相沉积层制造的太阳能电池产生高达14.2%的稳定功率转换效率。因此，我们证明了可以气相沉积高效的FAPbI（3）太阳能电池，这开辟了一条通往大面积稳定的钙钛矿光致发光的途径。
Perovskite thin-film solar cells are one of the most promising emerging renewable energy technologies because of their potential for low-cost, large-area fabrication combined with high energy conversion efficiencies. Recently, formamidinium lead triiodide (FAPbI(3)) and other formamidinium (CH(NH2)(2)) based perovskites have been explored as interesting alternatives to methylammonium lead triiodide (MAPbI(3)) because they exhibit better thermal stability. However, at present a major challenge is the scale-up of perovskite solar cells from small test-cells to full solar modules. We show that coevaporation is a scalable method for the deposition of homogeneous FAPbI3 thin films over large areas. The method allows precise control over film thickness and results in highly uniform, pinhole-free layers. Our films exhibited a high charge carrier mobility of 26 cm(2) V-1 s(-1), excellent optical properties, and a bimolecular recombination constant of 7 X 10(-11) cm(3)s(-1). Solar cells fabricated using these vapor-deposited layers within a regular device architecture produced stabilized power conversion efficiencies of up to 14.2%. Thus, we demonstrate that efficient FAPbI(3) solar cells can be vapor-deposited, which opens up a pathway toward large-area stable perovskite photovoltaics.