Multichannel Interdiffusion Driven FASnI3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells
Multichannel Interdiffusion Driven FASnI3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells
复制标题
使用水性混合盐/聚合物溶液形成多通道相互扩散驱动的 FASnI(3) 薄膜，用于柔性无铅钙钛矿太阳能电池
DOI：
10.1002/adma.201606964
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发表时间：
2017-06-20
影响因子：
29.4
通讯作者：
Kanatzidis, Mercouri G.
中科院分区：
文献类型：
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作者：
Xi, Jun;Wu, Zhaoxin;Kanatzidis, Mercouri G.
锡基钙钛矿由于在钙钛矿太阳能电池中提供了无铅替代品，因此越来越受到人们的关注。然而，沉积高质量的锡基钙钛矿薄膜仍然是一个挑战，特别是对于低温平面异质结(PHJ)器件。在这里，我们展示了一种“多通道互扩散”协议，它是通过对沉积在水溶液中的碘甲酸甲酰胺(FAI)/聚合物层和蒸发SnI(2)层的堆积层进行退火热处理来生成均匀的FASnI(3)薄膜。在该方案中，被引入的聚合物显著抑制的微小FAI晶体可以为与SnI2的完全反应提供多个互扩散路径。更重要的是，用水而不是传统的非质子有机溶剂来溶解前体。用该方案组装的性能最好的FASnI(3)PHJ太阳电池的功率转换效率(PCE)为3.98%。此外，在聚萘二甲酸铟-氧化铟柔性衬底上组装了一种柔性FASnI(3)基柔性太阳电池，其PCE为3.12%。这种新的互扩散工艺有助于进一步提高无铅锡基钙钛矿的性能。
Tin (Sn)-based perovskites are increasingly attractive because they offer lead-free alternatives in perovskite solar cells. However, depositing high-quality Sn-based perovskite films is still a challenge, particularly for low-temperature planar heterojunction (PHJ) devices. Here, a "multichannel interdiffusion" protocol is demonstrated by annealing stacked layers of aqueous solution deposited formamidinium iodide (FAI)/polymer layer followed with an evaporated SnI2 layer to create uniform FASnI(3) films. In this protocol, tiny FAI crystals, significantly inhibited by the introduced polymer, can offer multiple interdiffusion pathways for complete reaction with SnI2. What is more, water, rather than traditional aprotic organic solvents, is used to dissolve the precursors. The best-performing FASnI(3) PHJ solar cell assembled by this protocol exhibits a power conversion efficiency (PCE) of 3.98%. In addition, a flexible FASnI(3)-based flexible solar cell assembled on a polyethylene naphthalate-indium tin oxide flexible substrate with a PCE of 3.12% is demonstrated. This novel interdiffusion process can help to further boost the performance of lead-free Sn-based perovskites.