Phase Pure 2D Perovskite for High-Performance 2D-3D Heterostructured Perovskite Solar Cells
Phase Pure 2D Perovskite for High-Performance 2D-3D Heterostructured Perovskite Solar Cells
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用于高性能 2D-3D 异质结构钙钛矿太阳能电池的相纯 2D 钙钛矿
DOI：
10.1002/adma.201805323
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发表时间：
2018-12-27
影响因子：
29.4
通讯作者：
Song, Yanlin
中科院分区：
文献类型：
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作者：
Li, Pengwei;Zhang, Yiqiang;Song, Yanlin
三维（3D）金属卤化物钙钛矿太阳能电池（PSC）已表现出极高的效率。然而，3D钙钛矿的不稳定性是工业化的主要挑战。在钙钛矿晶体中掺入一些长有机阳离子来终止晶格，并起到水分和氧钝化层和离子迁移阻挡层的作用，被证明是增强钙钛矿稳定性的有效方法。不幸的是，这种方法通常会牺牲钙钛矿的载流子提取效率。即使在 2D-3D 垂直排列的异质结构中，由于不同程度的量子限制而导致的 2D 带隙扩展也会导致载流子局域化和载流子迁移率降低。在功率转换效率和稳定性之间进行权衡。在这里，通过将 2D C6H18N2O2PbI4 (EDBEPbI4) 微晶引入前驱体溶液中，沉积的 3D 钙钛矿薄膜的晶界被相纯的 2D 钙钛矿垂直钝化。纯（无机层数 n = 1）2D 钙钛矿相可以最大限度地减少低维钙钛矿中的光生载流子局域化。主要的垂直排列不会影响电荷载流子的提取。因此，这些 2D-3D 混合物证明了高效率 (21.06%) 和超稳定（在空气中 3000 小时后保留初始效率的 90%）平面 PSC。
Three-dimensional (3D) metal-halide perovskite solar cells (PSCs) have demonstrated exceptional high efficiency. However, instability of the 3D perovskite is the main challenge for industrialization. Incorporation of some long organic cations into perovskite crystal to terminate the lattice, and function as moisture and oxygen passivation layer and ion migration blocking layer, is proven to be an effective method to enhance the perovskite stability. Unfortunately, this method typically sacrifices charge-carrier extraction efficiency of the perovskites. Even in 2D-3D vertically aligned heterostructures, a spread of bandgaps in the 2D due to varying degrees of quantum confinement also results in charge-carrier localization and carrier mobility reduction. A trade-off between the power conversion efficiency and stability is made. Here, by introducing 2D C6H18N2O2PbI4 (EDBEPbI4) microcrystals into the precursor solution, the grain boundaries of the deposited 3D perovskite film are vertically passivated with phase pure 2D perovskite. The phases pure (inorganic layer number n = 1) 2D perovskite can minimize photogenerated charge-carrier localization in the low-dimensional perovskite. The dominant vertical alignment does not affect charge-carrier extraction. Therefore, high-efficiency (21.06%) and ultrastable (retain 90% of the initial efficiency after 3000 h in air) planar PSCs are demonstrated with these 2D-3D mixtures.