Uniform Permutation of Quasi-2D Perovskites by Vacuum Poling for Efficient, High-Fill-Factor Solar Cells
Uniform Permutation of Quasi-2D Perovskites by Vacuum Poling for Efficient, High-Fill-Factor Solar Cells
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DOI：
10.1016/j.joule.2019.09.020
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发表时间：
2019-12-18
期刊：
影响因子：
39.8
通讯作者：
Hu, Bin
中科院分区：
文献类型：
--
作者：
Zhang, Jia;Qin, Jiajun;Hu, Bin
垂直有序（小到大的n）准2D钙钛矿膜用作促进定向电荷转移的常用方法。在这里，我们报告了一种不同的策略，通过引入真空极化处理，以加强在结晶过程中的成核均匀排列不同的n值的纳米片（PEA（2）MA（n-1）Pb（n）I（3 n +1））。这种均匀的分布是通过精密的机械胶带剥离方法，同时监测光吸收，光致发光（PL）和能量色散X射线光谱（EDS）验证。在均匀分布的情况下，瞬态吸收揭示了10 ps内的有效载流子转移。此外，还展示了82.4%的创纪录的填充因子（FF）和18.04%的功率转换效率（PCE）（Voc = 1.223 V，Jsc = 17.91 mA/cm（2））。贮存8个月后，初始效率保持96.1%，在80 ℃下贮存180 h以上，效率保持97.7%，具有良好的上级稳定性。这种均匀排列的不同n值纳米片提供了一种新的材料工程策略，以增强载流子的转移和提取，从而开发出高效和稳定的准二维钙钛矿太阳能电池。
The vertically ordered (small-to-large n) quasi-2D perovskite films serve as common approaches to facilitate directional charge transfer. Here, we report a different strategy of uniformly arranging different-n-value nanoplates (PEA(2)MA(n-1)Pb(n)I(3n+1)) by introducing vacuum poling treatment to enforce nucleation during crystallization. This uniform distribution is verified by delicate mechanical tape-peeling method while monitoring optical absorption, photoluminescence (PL), and energy-dispersive X-ray spectroscopy (EDS). With uniform distribution, efficient carrier transfer within 10 ps is revealed by transient absorption. Moreover, record-high fill factor (FF) of 82.4% with power conversion efficiency (PCE) of 18.04% (Voc = 1.223 V, Jsc = 17.91 mA/cm(2)) was demonstrated. Superior stability is achieved with retaining 96.1% of initial efficiency after 8-month storage and maintaining 97 7% at 80'C for over 180 h. This uniformly arranging different-n-value nanoplates offers a new material engineering strategy to enhance carrier transfer and extraction for developing high-efficiency and stable quasi-2D perovskite solar cells.